Question 1

Seismic hazard zones of India

Accepted Answer

India, due to its unique geological setting, particularly the collision of the Indian plate with the Eurasian plate, is highly susceptible to seismic activity. The Bureau of Indian Standards (BIS) has classified India into four seismic zones (Zone II, III, IV, and V) based on the expected intensity of earthquakes. Zone V is the most seismically active, while Zone II is the least. Zone V (Very High Damage Risk Zone): This zone covers the entire northeastern India, parts of Jammu and Kashmir, Himachal Pradesh, Uttarakhand, the Rann of Kutch in Gujarat, and parts of North Bihar. These regions are prone to earthquakes of magnitude 8 or higher. Zone IV (High Damage Risk Zone): This zone includes the remaining parts of Jammu and Kashmir, Himachal Pradesh, Uttarakhand, parts of Haryana, Punjab, Delhi, Uttar Pradesh, Bihar, West Bengal, parts of Gujarat, and small portions of Maharashtra near the west coast. Earthquakes of magnitude 7-7.9 can occur here. Zone III (Moderate Damage Risk Zone): This zone covers a large part of the country, including parts of Rajasthan, Madhya Pradesh, Chhattisgarh, Odisha, Andhra Pradesh, Karnataka, Maharashtra, and the Andaman and Nicobar Islands. Moderate earthquakes (magnitude 6-6.9) are expected. Zone II (Low Damage Risk Zone): This zone covers the stable continental interior parts of the country, primarily the Deccan Plateau. While considered low risk, minor tremors can still occur. Understanding these zones is crucial for implementing appropriate building codes, disaster preparedness, and land-use planning to mitigate the impact of future seismic events.

Question 2

Origin of Karst topography

Accepted Answer

Karst topography is a distinctive landscape formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. The term 'karst' originates from the Karst region of Slovenia, where such features are prominently developed. Formation Process: The primary mechanism for karst formation is chemical weathering, specifically carbonation. Rainwater, as it falls through the atmosphere, absorbs carbon dioxide, forming a weak carbonic acid. This acidic water then percolates through cracks and fissures in soluble bedrock. As it seeps, it reacts with calcium carbonate (the main component of limestone), dissolving it and enlarging the existing fractures. Key Factors: 1. Soluble Rock: The presence of thick, massive, and highly soluble rock layers (like limestone) is fundamental. 2. Fractures and Joints: An abundance of joints, bedding planes, and fractures in the rock allows water to penetrate and initiate dissolution. 3. Precipitation: Sufficient rainfall is necessary to provide the acidic water for dissolution. 4. Vegetation: Organic acids from decaying vegetation can enhance the acidity of groundwater, accelerating dissolution. 5. Subsurface Drainage: The development of an integrated subsurface drainage system, often leading to caves and underground rivers, is characteristic. Characteristic Features: Karst landscapes are characterized by surface features like sinkholes (dolines), disappearing streams, poljes (large closed depressions), and limestone pavements. Subsurface features include intricate cave systems, stalactites, stalagmites, and underground rivers. The continuous dissolution and collapse of overlying rock create these unique and often dramatic landforms.

Question 3

Digital image processing

Accepted Answer

Digital image processing (DIP) refers to the use of computer algorithms to perform operations on digital images. It involves manipulating and analyzing images to enhance their quality, extract information, or transform them for various applications. Unlike analog image processing, which uses physical objects like lenses and filters, DIP uses numerical representations of images. Core Concepts: A digital image is represented as a grid of pixels, each with a numerical value representing its intensity or color. DIP algorithms operate on these pixel values. Key Stages/Techniques: 1. Image Acquisition: Capturing the image using sensors (e.g., cameras, scanners). 2. Image Enhancement: Improving the visual quality of an image for human interpretation or further processing. Techniques include contrast stretching, histogram equalization, noise reduction (e.g., median filtering), and sharpening. 3. Image Restoration: Removing degradation from images due to factors like blur, noise, or atmospheric interference, often using mathematical models of the degradation process. 4. Image Transformation: Changing the image's domain, such as converting it from spatial domain to frequency domain (e.g., using Fourier Transform) for easier analysis or compression. 5. Image Compression: Reducing the amount of data required to represent an image, facilitating storage and transmission (e.g., JPEG, PNG). 6. Image Segmentation: Partitioning an image into multiple segments or objects, often to locate objects and boundaries (e.g., edge detection, region growing). 7. Feature Extraction: Identifying and quantifying specific characteristics or patterns within an image, such as shape, texture, or color. 8. Image Recognition/Classification: Assigning labels to objects or regions in an image based on extracted features, often using machine learning algorithms. Applications: DIP is widely used in remote sensing (satellite imagery analysis), medical imaging (MRI, X-ray), computer vision, security (facial r

Question 4

Morphological classification of rock cleavage

Accepted Answer

Rock cleavage refers to the tendency of rocks to split along closely spaced, parallel planes, distinct from bedding planes. It is a pervasive planar fabric developed in fine-grained rocks, typically formed under directed stress during deformation and metamorphism. Morphological classification categorizes cleavage based on its appearance and relationship to the rock's mineral grains. Main Types of Cleavage: 1. Slaty Cleavage: This is the most perfect and pervasive type, characterized by extremely closely spaced, parallel planar surfaces along which the rock (slate) splits readily. It forms in very fine-grained rocks (e.g., shales) under low-grade metamorphic conditions. The cleavage planes are typically defined by the parallel alignment of platy minerals like micas and chlorite, which recrystallize perpendicular to the maximum principal stress. 2. Phyllitic Cleavage: Found in phyllites, this cleavage is similar to slaty cleavage but is slightly coarser and often has a distinctive silky or satiny sheen due to the larger size and greater abundance of aligned mica minerals. The cleavage surfaces are still very planar and closely spaced. 3. Crenulation Cleavage: This type develops in rocks that have undergone multiple phases of deformation. It forms by the micro-folding or crenulation of a pre-existing planar fabric (like slaty cleavage or bedding). The new cleavage planes are defined by the axial planes of these micro-folds, often appearing as discrete zones of dissolution or recrystallization. It can be either discrete (sharp, distinct planes) or continuous (more diffuse). 4. Schistosity: While often considered a type of foliation rather than cleavage, schistosity represents a more advanced stage of metamorphic fabric development than slaty or phyllitic cleavage. It is characterized by the parallel alignment of coarse-grained platy or elongate minerals (e.g., micas, amphiboles) in medium- to high-grade metamorphic rocks (schists). The surfaces are typically wavy or irr

Question 5

Fault zone rocks

Accepted Answer

Fault zones are regions within the Earth's crust where rocks have been fractured and displaced due to tectonic stresses. The rocks within these zones undergo intense deformation, leading to the formation of specific rock types collectively known as fault rocks or cataclasites. The nature of these rocks depends on factors such as temperature, pressure, strain rate, and the original rock type. Classification of Fault Zone Rocks: 1. Cataclasites: These are incohesive to cohesive rocks formed by brittle deformation, involving fracturing, crushing, and rotation of mineral grains without significant mineralogical changes. They typically form at shallow crustal depths (low temperature and pressure). Fault Breccia: Characterized by angular rock fragments (clasts) set in a finer-grained matrix. It forms from intense fracturing and comminution of the host rock. Fault Gouge: A very fine-grained, clay-rich, unconsolidated material formed by extreme pulverization of rocks within the fault core. It often acts as a low-friction layer. 2. Mylonites: These are cohesive, foliated rocks formed by ductile deformation, involving grain size reduction (dynamic recrystallization) and preferred orientation of minerals under high strain. They typically form at deeper crustal levels (higher temperature and pressure). Protomylonite: Contains less than 50% matrix, with recognizable porphyroclasts (relict grains) of the original rock. Mylonite: Contains 50-90% matrix, with significant grain size reduction and a strong foliation. Ultramylonite: Contains more than 90% matrix, with extreme grain size reduction, often appearing as a very fine-grained, dark, flinty rock. 3. Pseudotachylite: A rare, dark, glassy or cryptocrystalline rock formed by frictional melting during very rapid, high-stress faulting (seismic slip). The intense heat generated by friction melts the rock, which then rapidly solidifies, often forming veins or injections. 4. Hydrothermal Alteration Products: Fault zones often act as

Question 6

Discuss different types of plate boundaries and enumerate their characteristic features.

Accepted Answer

Plate tectonics describes the large-scale motion of Earth's lithosphere, which is broken into several major and minor plates. These plates are in constant motion, interacting at their boundaries, leading to most of Earth's seismic and volcanic activity, and mountain building. There are three primary types of plate boundaries, each characterized by distinct geological processes and features. 1. Divergent Plate Boundaries: Divergent boundaries occur where two plates move away from each other. This process involves the upwelling of magma from the mantle, creating new oceanic crust. Characteristic Features: Mid-Ocean Ridges: These are underwater mountain ranges where new oceanic crust is generated. They are characterized by a central rift valley. Rift Valleys: On continents, divergent boundaries can create large rift valleys (e.g., East African Rift Valley) as the continental crust stretches and thins. Volcanism: Frequent, generally effusive (non-explosive) basaltic volcanism occurs as magma rises to fill the gap. Earthquakes: Shallow, relatively weak earthquakes are common along the rift zones. Hydrothermal Vents: Black smokers and white smokers, rich in minerals, are found along mid-ocean ridges. Oceanic Crust Formation: The process of seafloor spreading continuously adds new crust. 2. Convergent Plate Boundaries: Convergent boundaries occur where two plates move towards each other, resulting in the collision and often subduction of one plate beneath the other. The type of interaction depends on the nature of the colliding plates (oceanic-oceanic, oceanic-continental, continental-continental). Characteristic Features: Subduction Zones: Where an oceanic plate descends beneath another plate (oceanic or continental). This is marked by a deep ocean trench. Volcanic Arcs: As the subducting plate melts, magma rises to form chains of volcanoes (e.g., Andes Mountains, Mariana Islands). Mountain Ranges: Intense compression and uplift lead to the formation of major mountain bel

Question 7

Compare the geomorphological and geological features of peninsular and extra-peninsular regions of India.

Accepted Answer

India can be broadly divided into two major physiographic and geological provinces: the Peninsular India and the Extra-Peninsular India (Himalayan region). These two regions exhibit stark differences in their geomorphological (landforms) and geological (rock types, structures, and history) characteristics, reflecting their distinct tectonic histories. 1. Peninsular India: Geological Features: Ancient Crystalline Rocks: Comprises some of the oldest and most stable landmasses on Earth, primarily composed of Precambrian crystalline rocks (gneisses, granites, schists) that are part of the Gondwana supercontinent. Stable Block: Geologically a stable block, often referred to as a 'shield' or 'craton', which has largely remained undisturbed by major tectonic activity since the Precambrian. Sedimentary Cover: Limited sedimentary cover, mainly Cuddapah and Vindhyan Supergroups (Proterozoic), and Gondwana sediments (Permo-Carboniferous to Jurassic) in rift basins (e.g., Damodar Valley). Deccan Traps: A significant portion of the northwestern peninsula is covered by extensive flood basalts known as the Deccan Traps, formed during the Late Cretaceous-Early Paleocene. Mineral Rich: Rich in metallic minerals (iron ore, manganese, bauxite) and non-metallic minerals (mica, limestone) due to its ancient crystalline nature. Geomorphological Features: Plateau Landscape: Dominated by a vast plateau, gently sloping eastward, with an average elevation of 600-900 meters. Erosional Features: Characterized by mature river systems (e.g., Godavari, Krishna, Kaveri, Mahanadi) with broad valleys and deltas, indicating long periods of erosion and stability. Residual Mountains: Features like the Aravallis, Vindhyas, Satpuras, Western Ghats, and Eastern Ghats are mostly relict or residual mountains, formed by erosion of ancient uplifted blocks, rather than recent tectonic folding. Coastal Plains: Narrow coastal plains along the Arabian Sea and broader plains along the Bay of Bengal. Absence of Gla

Question 8

What are joints? Discuss the types of joints developed during folding.

Accepted Answer

Joints are fractures in rocks along which there has been little or no measurable displacement parallel to the fracture surface. Unlike faults, which involve significant shear displacement, joints are primarily extensional features, representing planes of weakness where rocks have pulled apart. They are ubiquitous in most rock types and can range in scale from microscopic to hundreds of meters long. Characteristics of Joints: Planar Features: Joints are typically planar or gently curved surfaces. No Relative Movement: The key distinguishing feature from faults is the absence of significant shear displacement. Systematic vs. Non-systematic: Joints often occur in sets, forming systematic patterns (e.g., parallel or orthogonal sets), but can also be non-systematic (irregular). Origin: They form due to various stresses, including tectonic forces (folding, faulting, uplift), cooling and contraction (e.g., columnar joints in basalt), unloading (exfoliation joints), and desiccation. Types of Joints Developed During Folding: Folding is a ductile deformation process where rock layers are bent or curved due to compressive stresses. As rocks fold, different parts of the fold experience varying stress regimes (tension, compression, shear), leading to the development of specific types of joints. These joints are often geometrically related to the fold structure. 1. Longitudinal Joints (Axial Planar Joints): Orientation: These joints are typically parallel to the axial plane of the fold and perpendicular to the bedding planes. They run along the length of the fold. Formation: They form in response to the maximum compressive stress being parallel to the fold axis and the minimum compressive stress being perpendicular to the axial plane. They are often extensional joints that open up as the fold develops. Location: Common in the hinge zones of folds, where bending stresses are highest. 2. Transverse Joints (Cross Joints): Orientation: These joints are oriented perpendicular to the f

Question 9

What are river terraces? Discuss their geological significance.

Accepted Answer

River terraces are relatively flat, step-like landforms that occur along the sides of river valleys, standing above the present floodplain. They represent former floodplains or valley bottoms that have been abandoned by the river as it incised downwards. Terraces are essentially remnants of older, higher valley floors. Formation of River Terraces: River terraces form due to changes in a river's erosional and depositional regime, primarily driven by: 1. Base Level Changes: A drop in the regional or local base level (e.g., sea level fall, tectonic uplift of the land) causes the river to incise downwards, abandoning its old floodplain. 2. Climatic Changes: Fluctuations in climate can alter a river's discharge and sediment load. During periods of increased discharge or reduced sediment supply, a river may incise. Conversely, increased sediment supply (e.g., from glacial meltwater) can lead to aggradation (deposition), forming a new floodplain, which is later incised. 3. Tectonic Uplift: Regional or localized tectonic uplift can increase the gradient of a river, causing it to erode downwards and create terraces. 4. Isostatic Rebound: Following the retreat of glaciers, the land surface can rebound, leading to river incision and terrace formation. Types of River Terraces: Erosional (Rock-cut) Terraces: Formed when a river cuts through bedrock, leaving a thin veneer of alluvium on top of a bedrock platform. The terrace surface is primarily bedrock. Depositional (Alluvial) Terraces: Formed when a river first deposits a thick layer of alluvium to build up a floodplain, and then incises through this alluvium, leaving remnants of the older floodplain as terraces. Paired Terraces: Occur at the same elevation on both sides of the valley, indicating a relatively uniform downcutting across the valley. Unpaired Terraces: Occur at different elevations on opposite sides of the valley, often indicating lateral migration of the river channel during incision or differential uplift. Geolo

Question 10

How would you differentiate between a fault and an unconformity in the field?

Accepted Answer

Differentiating between a fault and an unconformity in the field is crucial for accurately interpreting the geological history and structure of an area. Both are planar features representing breaks in the geological record, but they originate from distinct processes and have different implications. A fault represents a break with significant displacement, while an unconformity represents a break in the depositional record, often with a period of erosion. Here's how to differentiate them in the field: 1. Definition and Origin: Fault: A fracture in rock along which there has been significant relative displacement of the blocks on either side. It results from brittle deformation under stress, where rocks break and slide past each other. Unconformity: A buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating a gap in the geological record. It represents a period of uplift, erosion, and/or non-deposition, followed by renewed deposition. 2. Evidence of Displacement (Faults): Offset Layers: The most definitive evidence of a fault is the visible offset of rock layers, veins, dikes, or other geological markers across the plane. Layers on one side of the fault will not align with those on the other. Fault Gouge and Breccia: The grinding action along a fault plane often produces crushed rock material. Fault gouge is a fine-grained, clay-like material, while fault breccia consists of angular rock fragments cemented together. These are typically absent at unconformities. Slickensides and Striations: Polished and grooved surfaces (slickensides) with parallel scratches (striations) on the fault plane indicate the direction of movement. These are direct evidence of frictional sliding. Drag Folds: Layers adjacent to a fault may be bent or 'dragged' in the direction of movement due due to frictional resistance. Mylonites: In deeper, ductile fault zones, highly strained and foliated rocks called mylonites can form. 3. Evidence of

Question 11

Giving suitable examples discuss the strategies which may be adopted to control river water pollution.

Accepted Answer

River water pollution is a critical environmental issue, impacting ecosystems, human health, and economic activities. It arises from various sources, including industrial discharge, agricultural runoff, municipal sewage, and urban stormwater. Effective control requires a multi-faceted approach involving regulatory, technological, and behavioral strategies. Here are some key strategies with examples: 1. Source Reduction and Prevention: Industrial Waste Minimization: Encouraging industries to adopt cleaner production technologies, recycle wastewater, and reduce the generation of pollutants at the source. Example: Textile industries implementing zero liquid discharge (ZLD) systems, where all wastewater is treated and reused, preventing discharge into rivers. Sustainable Agriculture Practices: Promoting practices that reduce nutrient and pesticide runoff. Example: Precision agriculture, where fertilizers and pesticides are applied only when and where needed, minimizing excess. Implementing riparian buffer zones (strips of vegetation along riverbanks) to filter runoff before it reaches the river. Household Waste Management: Educating households on proper disposal of hazardous waste (e.g., old medicines, chemicals) and promoting responsible use of detergents and cleaning agents. 2. Wastewater Treatment: Municipal Sewage Treatment Plants (STPs): Investing in and upgrading STPs to treat domestic wastewater to a high standard before discharge. This involves primary (physical removal), secondary (biological treatment), and tertiary (advanced nutrient and pathogen removal) treatment. Example: The Thames Tideway Tunnel project in London, a massive infrastructure project to capture and treat raw sewage overflows, preventing them from entering the River Thames. Industrial Effluent Treatment Plants (ETPs): Mandating industries to install and operate ETPs to treat their specific industrial wastewater, removing heavy metals, organic pollutants, and other harmful substances. Example:

Question 12

4.(a) Discuss the recent advances and achievements of Indian Space Programme.

Accepted Answer

The Indian Space Programme, spearheaded by the Indian Space Research Organisation (ISRO), has made remarkable strides in recent decades, establishing India as a significant player in global space exploration and applications. These advancements span various domains, from planetary missions and satellite launches to indigenous technology development and societal applications. One of the most prominent achievements is in planetary exploration. The Mars Orbiter Mission (MOM), or Mangalyaan, successfully placed a spacecraft in Mars' orbit in 2014, making India the fourth entity to achieve this and the first Asian nation to do so on its maiden attempt. More recently, the Chandrayaan series of lunar missions has garnered international acclaim. Chandrayaan-1 (2008) confirmed the presence of water molecules on the Moon. Chandrayaan-2 (2019) involved an orbiter, lander (Vikram), and rover (Pragyan), though the lander had a hard landing. Building on this, Chandrayaan-3 (2023) achieved a historic soft landing on the lunar south pole, making India the fourth country to achieve a soft landing and the first to land near the south pole, a region of scientific interest for water ice. In Earth observation and remote sensing, ISRO has launched a series of advanced satellites like the Cartosat, Resourcesat, and Oceansat series, providing crucial data for urban planning, agriculture, disaster management, oceanography, and environmental monitoring. The RISAT (Radar Imaging Satellite) series offers all-weather, day-night imaging capabilities, enhancing surveillance and mapping. Communication satellites (INSAT/GSAT series) have revolutionized telecommunications, broadcasting, and internet services across India, connecting remote areas and supporting various government initiatives. The development of the indigenous navigation system, NavIC (Navigation with Indian Constellation), provides accurate real-time positioning and timing services over India and a region extending up to 1,500 km aro

Question 13

4.(b) Explain, how the geometry of minor folds are helpful in deciphering the geometry of regional folds in an area.

Accepted Answer

Minor folds, often referred to as parasitic folds, are smaller-scale folds that develop on the limbs or hinge zones of larger, regional folds. Their geometry, orientation, and vergence (the direction in which the fold closes) provide invaluable clues for deciphering the overall geometry and kinematics of the larger, regional structures, especially in areas with limited outcrop or complex deformation. Firstly, the orientation of minor folds directly relates to the orientation of the major fold. The axial plane of minor folds is typically parallel or sub-parallel to the axial plane of the major fold. Similarly, the hinge lines of minor folds are often parallel or sub-parallel to the hinge line of the major fold. By mapping the orientations of numerous minor folds across an area, geologists can infer the trend and plunge of the regional fold's hinge and the attitude of its axial plane, even if the major fold's hinge is not directly exposed. Secondly, the vergence of minor folds is a critical indicator. Minor folds on the limbs of a major fold typically verge towards the hinge of the major fold. For instance, on the upper limb of an anticline, minor folds will verge towards the crest, while on the lower limb, they will verge towards the trough. This systematic vergence pattern allows geologists to determine the position of the major fold's hinge relative to the observed outcrop and to distinguish between the limbs of a major fold. In a large, complex fold system, observing the vergence of minor folds can help identify the overall facing direction of the major structure. Thirdly, the style and asymmetry of minor folds can indicate the position on the major fold. Minor folds on the limbs tend to be asymmetric, with their short limbs parallel to the major fold's axial plane and their long limbs parallel to the major fold's bedding. Folds near the hinge zone of a major fold might be more symmetrical or show different styles of deformation. The tightness and interlimb angles

Question 14

4.(c) Discuss the advantages and limitations of remote sensing studies with respect to conventional geological field work.

Accepted Answer

Remote sensing studies and conventional geological field work are two fundamental approaches in geological investigations, each with distinct advantages and limitations. While remote sensing offers a broad, synoptic view, field work provides detailed, ground-level insights; ideally, they are complementary. Advantages of Remote Sensing Studies: 1. Large Area Coverage: Remote sensing platforms (satellites, aircraft) can acquire data over vast and often inaccessible regions quickly, providing a synoptic view that is impossible to achieve through ground surveys alone. 2. Cost-Effectiveness: For initial reconnaissance and regional mapping, remote sensing can be significantly more cost-effective than extensive field campaigns, especially in remote or hazardous areas. 3. Temporal Monitoring: Satellites can repeatedly acquire data over the same area, allowing for monitoring of dynamic geological processes such as landslides, volcanic activity, glacier movement, and changes in land use over time. 4. Multi-spectral and Hyperspectral Data: Remote sensing instruments can capture data across various electromagnetic spectrum bands (visible, infrared, thermal, microwave), revealing geological features, mineral compositions, and vegetation patterns not discernible to the human eye. 5. Non-Invasive: Data acquisition is non-destructive and does not disturb the geological environment. 6. Safety: Reduces the need for geologists to enter dangerous or difficult terrains, enhancing safety. Limitations of Remote Sensing Studies: 1. Lack of Ground Truth: Remote sensing data requires validation through ground truthing. Without field verification, interpretations can be ambiguous or erroneous. 2. Limited Depth Penetration: Most remote sensing techniques primarily provide surface information. Subsurface geology can only be inferred indirectly. 3. Resolution Limitations: While improving, spatial and spectral resolutions can still be insufficient for identifying small-scale geological features o

Question 15

5.(a) Discuss the environment and modes of fossilization.

Accepted Answer

Fossilization is the process by which the remains or traces of ancient organisms are preserved in the Earth's crust. It is a rare event, requiring specific environmental conditions and modes of preservation. Environments of Fossilization: Fossilization is most likely to occur in environments where rapid burial and protection from decay are possible. These include: 1. Marine Environments: Shallow marine settings (e.g., continental shelves, reefs) are ideal due to high sedimentation rates and abundant marine life. Deep marine environments can also preserve fossils, especially in anoxic conditions that inhibit scavengers and decay. 2. Terrestrial Environments: Fluvial (river) and lacustrine (lake) systems can bury organisms rapidly in sediments. Eolian (wind-blown sand) environments can preserve footprints or larger remains. Glacial environments can preserve organisms in ice. Caves can also offer unique preservation conditions. 3. Transitional Environments: Estuaries, deltas, and lagoons, where marine and terrestrial influences meet, often have high sedimentation rates and can be excellent sites for fossilization. Key environmental factors influencing fossilization include: Rapid Burial: Protects remains from scavengers, erosion, and decomposition. Anoxic Conditions: Low oxygen levels inhibit aerobic bacteria and scavengers, slowing decay. Fine-Grained Sediments: Provide a tight seal around the organism, preventing degradation and preserving fine details. Mineral-Rich Waters: Can facilitate permineralization or replacement processes. Stable Tectonic Settings: Avoids subsequent metamorphism or erosion of fossil-bearing rocks. Modes of Fossilization: Fossils are preserved through various processes, broadly categorized as: 1. Permineralization (Petrification): Minerals (e.g., silica, calcite, pyrite) precipitate into the pore spaces of organic tissues (like bone or wood), hardening and preserving the original structure. The original organic material may or may not remain.

Question 16

5.(b) Discuss the tectonic sub-divisions of Himalaya.

Accepted Answer

The Himalaya, a classic example of a continent-continent collision zone, is tectonically subdivided into several distinct, generally east-west trending zones, separated by major thrust faults. These divisions reflect the progressive deformation and uplift resulting from the ongoing collision between the Indian and Eurasian plates. From south to north, these major tectonic zones are: 1. Sub-Himalaya (Outer Himalaya): This is the southernmost and youngest tectonic unit, comprising the Siwalik Group of rocks. It consists of molassic sediments (sandstones, siltstones, conglomerates) derived from the erosion of the rising Himalaya, deposited in foreland basins. It is bounded to the south by the Himalayan Frontal Thrust (HFT), which marks the active deformation front, and to the north by the Main Boundary Thrust (MBT). 2. Lesser Himalaya (Lower Himalaya): Lying north of the Sub-Himalaya, this zone is characterized by a thick sequence of Proterozoic to early Paleozoic sedimentary and low-grade metamorphic rocks (slates, phyllites, quartzites, limestones). These rocks are often highly folded and faulted. The Lesser Himalaya is separated from the Sub-Himalaya by the Main Boundary Thrust (MBT) and from the Great Himalaya to the north by the Main Central Thrust (MCT). 3. Great Himalaya (Higher Himalaya): This is the highest and most rugged part of the Himalaya, containing the world's highest peaks. It consists primarily of high-grade metamorphic rocks (gneisses, schists, migmatites) and crystalline granites, representing the deeply buried and metamorphosed parts of the Indian continental crust. The Great Himalaya is bounded to the south by the Main Central Thrust (MCT) and to the north by the South Tibetan Detachment System (STDS). 4. Tethyan Himalaya (Tibetan Himalaya): Located north of the Great Himalaya, this zone comprises a thick sequence of fossiliferous marine sedimentary rocks (limestones, shales, sandstones) ranging in age from Cambrian to Eocene. These rocks represen

Question 17

5.(c) Water bearing characteristics of rocks.

Accepted Answer

The water-bearing characteristics of rocks primarily refer to their ability to store and transmit groundwater. These properties are governed by two fundamental parameters: porosity and permeability. 1. Porosity: Porosity (φ) is a measure of the void spaces within a rock or sediment, expressed as the ratio of the volume of voids to the total volume of the rock. It determines the amount of water a rock can hold. Porosity can be classified as: Primary Porosity: Original pore spaces formed during the deposition and lithification of the rock (e.g., intergranular spaces in sandstones, vesicles in volcanic rocks). Secondary Porosity: Developed after rock formation due to processes like fracturing, faulting, or dissolution (e.g., solution cavities in limestones, fractures in igneous/metamorphic rocks). Factors influencing porosity include grain size, sorting, packing, cementation, and the degree of fracturing or dissolution. Well-sorted, uncemented sands typically have high porosity, while dense, unfractured igneous rocks have very low porosity. 2. Permeability: Permeability is a measure of the ability of a rock or sediment to transmit fluids (like water) through its interconnected pore spaces. It depends not only on the total volume of pores but also on their size, shape, and degree of interconnection. A rock can be highly porous but have low permeability if its pores are not well connected (e.g., clay). Based on these characteristics, rocks are categorized in terms of their hydrogeological function: Aquifer: A geological formation that can store and transmit significant quantities of groundwater. Aquifers are typically both porous and permeable. Examples include well-sorted sandstones, gravels, fractured limestones, and highly fractured igneous or metamorphic rocks. Aquitard: A geological formation that can store water but transmits it very slowly due to low permeability. It acts as a semi-confining layer. Examples include shales, silts, and some clay-rich sandstones. Aqu

Question 18

5.(d) Concept of rainwater harvesting.

Accepted Answer

Rainwater harvesting (RWH) is a simple yet effective method of collecting and storing rainwater from various surfaces, such as rooftops, land surfaces, or rock catchments, for future use. The fundamental concept involves intercepting rainfall before it runs off or infiltrates the ground and diverting it to a storage system. Purpose and Benefits: 1. Water Conservation: RWH is a sustainable practice that conserves water by utilizing a natural, renewable resource, reducing reliance on conventional water sources like groundwater or municipal supply. 2. Groundwater Recharge: Collected rainwater can be used to replenish groundwater aquifers through artificial recharge structures like recharge pits, trenches, or borewells, helping to combat declining water tables. 3. Reduced Runoff and Flooding: By capturing rainwater, RWH systems help mitigate urban flooding and soil erosion by reducing the volume and velocity of surface runoff. 4. Improved Water Quality: Rainwater, especially rooftop runoff, is generally clean and free from pollutants found in surface water bodies, making it suitable for various uses after minimal treatment. 5. Decentralized Water Supply: Provides a localized and independent water source, particularly beneficial in water-scarce regions, rural areas, or during emergencies. 6. Cost-Effective: Once installed, the operational costs of RWH systems are minimal, and they can significantly reduce water bills. 7. Environmental Benefits: Reduces the energy consumption associated with pumping and treating municipal water, contributing to a lower carbon footprint. Methods of Rainwater Harvesting: 1. Rooftop Rainwater Harvesting: Rainwater is collected from the roofs of buildings and channeled through pipes to a storage tank or a groundwater recharge system. This is common in urban and rural households. 2. Surface Runoff Harvesting: Involves collecting rainwater from open spaces, paved areas, or natural catchments. This water can be directed to ponds, reservoirs, or

Question 19

5.(e) Lower Gondwana flora and its significance.

Accepted Answer

The Lower Gondwana flora, primarily characterized by the distinctive Glossopteris flora, represents a significant paleobotanical assemblage that flourished across the Gondwanaland supercontinent during the Permian period (approximately 299 to 252 million years ago). This flora is of immense geological and paleogeographical significance. Characteristics of Lower Gondwana Flora: The flora is dominated by the genus Glossopteris, a seed fern characterized by tongue-shaped leaves with a prominent midrib and reticulate (net-like) venation. Other important genera associated with this flora include: Gangamopteris: Similar to Glossopteris but with a less prominent midrib and more open venation. Vertebraria: The distinctive rootstock of Glossopteris, characterized by a segmented, vertebral-like structure. Schizoneura: A sphenopsid (horsetail-like plant) with jointed stems and whorled leaves. Pterophyllum: A cycadophyte with pinnate leaves. Conifers and Lycopods: Also present, though less dominant than the seed ferns. Significance of Lower Gondwana Flora: 1. Evidence for Gondwanaland: The widespread distribution of the Glossopteris flora across geographically separated continents—India, Australia, Antarctica, Africa, and South America—was one of the earliest and most compelling pieces of evidence supporting Alfred Wegener's theory of continental drift and the existence of the supercontinent Gondwanaland. This identical flora across continents that are now thousands of kilometers apart strongly suggested they were once connected. 2. Paleoclimate Indicator: The Glossopteris flora is adapted to cool, moist, and possibly seasonal climates, often associated with glacial conditions. Its presence in regions that are now tropical or subtropical indicates a significant shift in paleoclimate and continental positions over geological time. It contrasts sharply with the coeval, warm-climate floras of the Northern Hemisphere (Laurasia). 3. Coal Formation: The luxuriant growth of the Glosso

Question 20

6.(a) How would you differentiate between 'in-situ' and 'derived fossils?

Accepted Answer

Differentiating between 'in-situ' and 'derived' fossils is crucial for accurate paleontological and stratigraphic interpretations. An 'in-situ' fossil provides direct evidence of the ancient environment and life forms present at the time of sediment deposition, whereas a 'derived' fossil indicates erosion and redeposition from older strata, potentially leading to misinterpretations if not recognized. In-situ Fossils (Autochthonous Fossils): 'In-situ' fossils are those found in their original life position or very close to where the organism lived and died. They are preserved within the sediments that accumulated around them shortly after their death, reflecting the environment of deposition and the biological community of that specific time. Characteristics: Original Life Position: Organisms like corals, bivalves, or rooted plants are found upright or in growth position. Articulated Skeletons: Complete or largely articulated skeletons suggest minimal transport and rapid burial. Good Preservation: Often show fine details, indicating little to no abrasion or damage from transport. Consistent Stratigraphic Context: The age of the fossil is consistent with the age of the host rock, and the fossil assemblage reflects the depositional environment. Trace Fossils: Burrows, tracks, and trails are inherently in-situ, representing the activity of organisms within the sediment. Examples: A coral reef preserved as a fossil reef, bivalves found with both valves articulated and oriented as they would have lived, rooted tree stumps in ancient soil horizons, or undisturbed burrows. Derived Fossils (Allochthonous Fossils or Reworked Fossils): 'Derived' fossils are those that have been eroded from older rock formations and subsequently redeposited into younger sediments. They are essentially clasts (fragments) of older fossiliferous rock incorporated into a new sedimentary sequence. Their presence indicates a period of erosion and transport. Characteristics: Abrasion and Wear: Often s

Question 21

6.(b) Geological considerations for construction of tunnels in deformed geological terrain.

Accepted Answer

Constructing tunnels in deformed geological terrains presents significant challenges due to the complex and often unpredictable nature of the rock mass. Thorough geological investigations and careful engineering considerations are paramount to ensure the stability, safety, and longevity of the tunnel. Key geological factors include: 1. Structural Geology: Folds: Tunnels crossing fold limbs or hinge zones can encounter varying rock strengths and orientations of bedding planes. Hinge zones are often highly fractured and weaker, while limbs may have bedding planes dipping unfavorably relative to the tunnel axis, leading to wedge failures or block falls. Faults and Shear Zones: These are critical hazards. Faults represent zones of weakness, highly fractured and altered rock, and often contain fault gouge or breccia, which are extremely unstable. They can be conduits for groundwater, leading to water ingress and increased pore pressure. Active faults pose seismic risks. Shear zones, similar to faults, are zones of intense deformation and reduced rock mass quality. Joints and Fractures: The orientation, spacing, persistence, and roughness of joint sets significantly influence rock mass stability. Unfavorable joint orientations (e.g., dipping into the tunnel excavation) can lead to block falls, wedge failures, or planar sliding. High fracture density reduces rock mass strength and increases permeability. Stress Conditions: In-situ stress (virgin stress) can be high in deformed terrains, especially in mountainous regions. Tunnel excavation redistributes these stresses, potentially leading to rock bursts, squeezing ground, or excessive deformation, particularly in brittle or highly stressed rocks. 2. Lithology and Rock Mass Properties: Rock Type: The type of rock (e.g., granite, schist, shale, limestone) dictates its inherent strength, abrasiveness, and behavior under stress. Metamorphic rocks (schists, phyllites) can exhibit anisotropic behavior due to foliation, leading to

Question 22

6.(c) Give a stratigraphic account of Vindhyan Supergroup. Comment upon the life during Vindhyan times.

Accepted Answer

The Vindhyan Supergroup represents one of the largest and thickest sedimentary successions in the Indian subcontinent, primarily exposed in central India across parts of Rajasthan, Madhya Pradesh, Uttar Pradesh, and Bihar. It is a classic example of a Proterozoic sedimentary basin, largely unmetamorphosed, providing a crucial window into Earth's history during the Mesoproterozoic to Neoproterozoic eras. Stratigraphic Account of Vindhyan Supergroup: 1. Age and Extent: Age: The Vindhyan Supergroup spans a vast period from approximately 1600 Ma (Mesoproterozoic) to around 600 Ma (Neoproterozoic), making it one of the longest-lived sedimentary basins globally. Extent: It covers an area of about 100,000 sq km, forming a crescent-shaped basin along the northern margin of the Indian Shield, with its type area in the Son Valley. 2. Lithology and Depositional Environment: The Vindhyan Supergroup is predominantly composed of unmetamorphosed sedimentary rocks, including sandstones, shales, limestones, and conglomerates. These rocks indicate deposition in a variety of environments, ranging from shallow marine to fluvial and deltaic settings. 3. Major Subdivisions: The Vindhyan Supergroup is broadly divided into two main parts, the Lower Vindhyan and the Upper Vindhyan, further subdivided into groups: Lower Vindhyan (Semri Group): Age: Mesoproterozoic (approx. 1600-1400 Ma). Lithology: Dominated by shales, limestones, and sandstones, with some conglomerates and volcanic rocks (e.g., Porcellanite Formation). The limestones are often stromatolitic. Depositional Environment: Primarily shallow marine, with evidence of tidal flats and some volcanic activity. Key Formations: Kajrahat Limestone, Porcellanite Formation, Rohtas Limestone, Kaimur Sandstone (lower part). Upper Vindhyan: Age: Mesoproterozoic to Neoproterozoic (approx. 1400-600 Ma). Lithology: Characterized by thick successions of quartzitic sandstones, shales, and limestones, often showing mature, stable shelf deposition. S

Question 23

7.(a) Write short notes on the following: (i) Muth Quartzites (ii) Lameta Formation (iii) Tipam Formation

Accepted Answer

(i) Muth Quartzites Muth Quartzites represent a significant geological unit primarily found in the Lesser Himalayan region of India, particularly well-exposed in parts of Himachal Pradesh and Uttarakhand. This formation is characterized by its distinctive white to pinkish-white, highly pure, and often vitreous quartzites. Geologically, the Muth Quartzites are considered to be of Silurian to Devonian age, making them part of the older Paleozoic successions in the Himalayas. Lithologically, they are composed almost entirely of quartz grains, indicating a mature sedimentary source and extensive reworking. The purity of these quartzites suggests deposition in a high-energy, shallow marine or coastal environment, possibly a beach or tidal flat setting, where clastic sediments were subjected to intense wave and current action, leading to the removal of finer particles and less resistant minerals. The formation often exhibits well-developed cross-bedding and ripple marks, further supporting a shallow marine depositional environment. Stratigraphically, the Muth Quartzites typically overlie older formations like the Haimanta Group or Vaikrita Group and are often overlain by younger Carboniferous or Permian sequences. Their widespread occurrence and distinctive lithology make them an important marker horizon for regional correlation within the Lesser Himalayas. Economically, due to their high silica content, Muth Quartzites can be a potential source for high-grade silica, used in glass manufacturing, ceramics, and metallurgical industries. (ii) Lameta Formation The Lameta Formation is a crucial geological unit predominantly found in central and western India, particularly in states like Madhya Pradesh, Maharashtra, and Gujarat. This formation is famous for its rich paleontological content, especially dinosaur fossils, and represents a significant period in Earth's history, spanning the Late Cretaceous epoch (Maastrichtian stage), just before the K-Pg extinction event. Litholo

Question 24

7.(b) Describe the significance of microfossils in petroleum exploration.

Accepted Answer

Microfossils, defined as fossils that are generally less than 4 millimeters in size and require a microscope for detailed study, play an indispensable role in petroleum exploration. Their abundance, rapid evolutionary rates, wide geographic distribution, and preservation in various sedimentary environments make them powerful tools for understanding subsurface geology and identifying potential hydrocarbon reservoirs. The significance of microfossils in petroleum exploration can be broadly categorized into several key applications: 1. Biostratigraphy and Chronostratigraphy: Microfossils are excellent biostratigraphic markers. Different species or assemblages of microfossils (e.g., foraminifera, ostracods, radiolarians, diatoms, palynomorphs like spores and pollen) evolved and became extinct at specific geological times. This allows geologists to: Date Sedimentary Sequences: Accurately determine the age of rock layers encountered in wellbores, even in the absence of other dating methods. Correlate Strata: Establish time-equivalent relationships between rock units across different wells, basins, or even continents. This is crucial for understanding basin architecture and identifying potential reservoir trends. Identify Unconformities: Recognize gaps in the geological record, which can indicate periods of erosion or non-deposition, often associated with structural traps for hydrocarbons. 2. Paleoenvironmental Reconstruction: Microfossils are highly sensitive to environmental conditions such as water depth, salinity, temperature, oxygen levels, and nutrient availability. By analyzing microfossil assemblages, geologists can reconstruct the ancient depositional environments, which is vital for predicting the distribution of source rocks, reservoir rocks, and seals: Marine vs. Non-Marine: Distinguish between marine, brackish, and freshwater environments. Water Depth: Estimate paleobathymetry (e.g., shallow shelf, deep marine) based on specific benthic foraminifera or radiola

Question 25

7.(c) Discuss the geological considerations for selection of a dam site in Himalayan terrain.

Accepted Answer

The selection of a dam site in the Himalayan terrain is a complex undertaking, fraught with significant geological challenges due to the region's active tectonics, rugged topography, and diverse lithology. A thorough understanding and careful consideration of various geological factors are paramount to ensure the safety, stability, and longevity of the dam structure and its associated reservoir. Key geological considerations include: 1. Lithology and Rock Type: The type and quality of foundation rock are fundamental. Ideal dam sites are typically founded on strong, competent, and impermeable rocks such as massive granites, gneisses, quartzites, or sound basalts. Weak, highly weathered, or soluble rocks (e.g., shales, phyllites, limestones prone to karstification) are generally unsuitable as they can lead to foundation instability, excessive seepage, or differential settlement. The engineering properties of the rock, including strength, deformability, and permeability, must be thoroughly investigated. 2. Structural Geology: The Himalayas are a young, tectonically active mountain range characterized by intense folding, faulting, and fracturing. The presence and orientation of these structural features are critical: Faults and Shear Zones: Active faults pose a severe seismic risk and can compromise foundation stability. Even inactive faults or shear zones can be zones of weakness, high permeability, and potential differential movement. Their orientation relative to the dam axis is crucial; faults parallel to the dam axis are generally more problematic. Folds: Tight folds can create zones of weakness and varying rock competence. Overturned folds can lead to unfavorable dip directions of bedding planes. Joints and Fractures: The density, orientation, and infilling of joints significantly influence rock mass permeability, strength, and stability. Closely spaced, unfavorably oriented joints can lead to block failures or excessive leakage. 3. Seismicity: The entire Himalaya

Question 26

8.(a) What do you understand by groundwater recharge? Describe various methods used in this process.

Accepted Answer

What is Groundwater Recharge? Groundwater recharge is the hydrological process where water moves downward from the land surface into the groundwater system, replenishing aquifers. It is a critical component of the water cycle, balancing the discharge of groundwater to springs, rivers, and wells. Recharge can occur naturally through precipitation, infiltration from rivers and lakes, or artificially through human interventions designed to enhance the rate of water entering the aquifer. Natural Recharge: This occurs when precipitation infiltrates the soil, percolates through the unsaturated zone, and eventually reaches the water table. Factors influencing natural recharge include rainfall intensity and duration, soil type, vegetation cover, topography, and the presence of surface water bodies like rivers and lakes that can leak water into underlying aquifers. Artificial Recharge (Managed Aquifer Recharge - MAR): This refers to the intentional process of augmenting the natural infiltration of surface water or reclaimed water into groundwater aquifers. The primary goals of artificial recharge are to increase groundwater supplies, manage water resources more effectively, prevent saltwater intrusion in coastal areas, mitigate land subsidence, and improve water quality through natural filtration within the aquifer. Various Methods Used in Groundwater Recharge Artificial groundwater recharge methods can be broadly categorized into surface spreading techniques and well injection techniques, along with other innovative approaches: I. Surface Spreading Methods: These methods involve spreading water over a large land area to allow it to infiltrate naturally through the soil and unsaturated zone to reach the aquifer. They are generally suitable for unconfined aquifers with permeable soils and shallow water tables. 1. Recharge Basins/Pits: These are excavated or constructed depressions (ponds or pits) where water is impounded and allowed to infiltrate. They are effective in areas

Question 27

8.(b) Give an account of evolutionary trends in Equidae.

Accepted Answer

The evolutionary history of the horse family (Equidae) is one of the most complete and celebrated examples of mammalian evolution, providing a classic case study of adaptive radiation and gradual change documented by an extensive fossil record. Originating in North America during the Eocene epoch, the Equidae lineage underwent significant transformations over approximately 55 million years, adapting from small, forest-dwelling browsers to the large, swift, grassland-dwelling grazers represented by modern horses, zebras, and asses (Equus). Several key evolutionary trends characterize the Equidae lineage: 1. Increase in Body Size: The earliest known horse ancestor, Hyracotherium (also known as Eohippus), was a small, dog-sized animal, standing about 20-60 cm tall at the shoulder. Over millions of years, there was a general trend towards increasing body size, culminating in the much larger modern Equus species, which can stand over 150 cm tall. This increase in size provided advantages for escaping predators in open environments and for processing larger quantities of fibrous plant material. 2. Reduction in Toes and Development of a Single Hoof: Perhaps the most dramatic and well-documented trend is the reduction in the number of toes. Hyracotherium had four functional toes on its front feet and three on its hind feet, each ending in a small hoof-like structure, suitable for walking on soft forest floors. As grasslands expanded and horses moved into open plains, there was strong selective pressure for increased speed and efficiency of locomotion on hard ground. This led to: Loss of Side Toes: The lateral toes gradually diminished in size and function, becoming vestigial splint bones in modern horses. Enlargement of the Central Toe: The third (middle) toe became progressively larger and stronger, eventually forming the single, weight-bearing hoof of Equus. This adaptation provided a more efficient spring mechanism for running and reduced the risk of injury on hard surfa

Question 28

8.(c) Give a geological account of Deccan volcanic province.

Accepted Answer

The Deccan Volcanic Province (DVP), commonly known as the Deccan Traps, is one of the largest and most significant Large Igneous Provinces (LIPs) on Earth, located in west-central India. It represents a colossal outpouring of volcanic material that profoundly impacted global climate and ecosystems, potentially contributing to the end-Cretaceous mass extinction event. 1. Age and Extent: The Deccan Traps primarily erupted during the Late Cretaceous to Early Paleocene epochs, with the main phase of volcanism occurring around 66 to 60 million years ago. This timing remarkably coincides with the Cretaceous-Paleogene (K-Pg) boundary, a period marked by a major mass extinction event. While the present-day exposed area covers approximately 500,000 square kilometers across Maharashtra, Gujarat, Madhya Pradesh, and parts of Karnataka and Andhra Pradesh, geological reconstructions suggest its original extent might have been as vast as 1.5 million square kilometers, with an estimated volume of over 1 million cubic kilometers of lava. 2. Lithology and Structure: The DVP is predominantly composed of tholeiitic basalts, which are dark, fine-grained volcanic rocks rich in iron and magnesium. These basalts form extensive, horizontal or gently dipping lava flows, often hundreds of meters thick, giving rise to a characteristic step-like topography (hence the term "Traps," derived from the Swedish word "trappa" meaning stairs). Individual flows can extend for tens to hundreds of kilometers. Interspersed within the basaltic flows are minor occurrences of more evolved rocks like rhyolites, trachytes, and lamprophyres, particularly in the western parts. The volcanic sequence is also intruded by numerous dykes and sills, which acted as feeders for the surface flows. 3. Origin and Tectonic Setting: The most widely accepted hypothesis for the origin of the Deccan Traps is its association with a mantle plume, specifically the Réunion hotspot. As the Indian plate drifted northward after its se

Geography Optional 2017 Paper I

28 Questions Available

Geography Optional 2017 Paper I

28 Questions Available

Question 1: Seismic hazard zones of India

Question 2: Origin of Karst topography

Question 3: Digital image processing

Question 4: Morphological classification of rock cleavage

Question 5: Fault zone rocks

Question 6: Discuss different types of plate boundaries and enumerate their characteristic features.

Question 7: Compare the geomorphological and geological features of peninsular and extra-peninsular regions of India.

Question 8: What are joints? Discuss the types of joints developed during folding.

Question 9: What are river terraces? Discuss their geological significance.

Question 10: How would you differentiate between a fault and an unconformity in the field?

Question 11: Giving suitable examples discuss the strategies which may be adopted to control river water pollution.

Question 12: 4.(a) Discuss the recent advances and achievements of Indian Space Programme.

Question 13: 4.(b) Explain, how the geometry of minor folds are helpful in deciphering the geometry of regional folds in an area.

Question 14: 4.(c) Discuss the advantages and limitations of remote sensing studies with respect to conventional geological field work.

Question 15: 5.(a) Discuss the environment and modes of fossilization.

Question 16: 5.(b) Discuss the tectonic sub-divisions of Himalaya.

Question 17: 5.(c) Water bearing characteristics of rocks.

Question 18: 5.(d) Concept of rainwater harvesting.

Question 19: 5.(e) Lower Gondwana flora and its significance.

Question 20: 6.(a) How would you differentiate between 'in-situ' and 'derived fossils?

Question 21: 6.(b) Geological considerations for construction of tunnels in deformed geological terrain.

Question 22: 6.(c) Give a stratigraphic account of Vindhyan Supergroup. Comment upon the life during Vindhyan times.

Question 23: 7.(a) Write short notes on the following: (i) Muth Quartzites (ii) Lameta Formation (iii) Tipam Formation

Question 24: 7.(b) Describe the significance of microfossils in petroleum exploration.

Question 25: 7.(c) Discuss the geological considerations for selection of a dam site in Himalayan terrain.

Question 26: 8.(a) What do you understand by groundwater recharge? Describe various methods used in this process.

Question 27: 8.(b) Give an account of evolutionary trends in Equidae.

Question 28: 8.(c) Give a geological account of Deccan volcanic province.