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Rocks

Processes that shape the earth: II – A presentation by ACWADAM

This presentation by ACWADAM deals with processes that scour the earth’s surface while simultaneously building it elsewhere. The presentation deals with weathering, erosion and deposition of rocks -Read More

  • The process of breaking down and alteration of rocks and formation of new materials from them is known as weathering of rocks.
  • The group of processes whereby the materials of the earth’s crust are moved from one place to another by running water (including rainfall), waves and current, glacier ice and wind is known as erosion.  
  • The processes whereby the material being carried during the process of erosion is deposited either through physical processes (such as drop in the velocity of flowing water) or precipitation of dissolved material under a set of conditions for instance, the deposition of limestones from water rich in calcium carbonate is known as deposition.

Earth sciences in watershed management – A presentation by ACWADAM

This presentation by ACWADAM on earth sciences in watershed management shows how the occurrence of water within a watershed is governed by the rock types occurring both at the surface and within the subsurface, their sequence and their structure. The presentation deals with the basic components involved in the mapping of a watershed –Read More

  • The type of rocks (lithology), and
  • The structure (whether these are folded, faulted, fractured, jointed etc.,)

The structure of the sub-surface – A presentation by ACWADAM

This presentation by ACWADAM deals with the structure of the sub-surface. The lithology and structure of rocks together define the geometric framework for the movement of groundwater. To some extent, these factors also govern the movement of surface water too. In other words, the physical environment of rocks and rock material hosts water, and hence, controls its accumulation and flow in the watershed.Read More

Remote sensing – A presentation by ACWADAM

These presentations by ACWADAM deal with the application of remote sensing and aerial photography techniques in groundwater management. Remote sensing is a technique by virtue of which information about an object, area or phenomenon is obtained with the help of a sensor on board a platform from distance without coming in contact with object, area or phenomenon.Read More

Vertical distribution of groundwater – A presentation by ACWADAM

This presentation by ACWADAM explains the occurrence of groundwater and deals with the vertical distribution of groundwater. To begin with, the openings in rocks in the zone of rock fracture such as intergranular openings, vesicles in volcanic rock, joints & fractures and solution cavities are described.Read More

Type of rocks – A presentation by ACWADAM

This presentation by ACWADAM deals with the three basic types of rocks that are found in nature – igneous, sedimentary and metamorphic. Rocks are classified on the basis of minerals & chemical composition, by texture and by the processes that formed them.Read More

Geology of India - DN Wadia - Macmillan publishers (1919)

Geology of India - Book CoverGeology is the science and study of the composition, structure, physical properties, dynamics and history of the liquid and solid materials/matter that constitutes the Earth, and the processes by which they are formed, moved or changed.

The Geology of India by DN Wadia, a geologist with the Geological Survey of India, is considered to be one of the most important and complete reference works available today on the subject.Read More

Contents
1. Physical features, 2. Stratigraphy of India, 3. The Archaean System, 4. The Dharwar System, 5. The Cuddapah System, 6. The Vindhyan System, 7. The Cambrian System, 8. The Silurian, Devonian and Lower Carboniferous Systems, 9, 10. The Gondwana System, 11. The Upper Carboniferous and Permian Systems, 12. The Triassic System, 13. The Jurassic System, 14, 15. The Cretaceous System, 16. The Deccan Trap, 17. The Tertiary Systems, 18. The Eocene System, 19. The Oligocene and Lower Miocene Systems, 20. The Siwalik System - Middle Miocene and Lower Pliocene, 21-24. The Pleistocene System, 25. Physiography, 26. Economic Geology, 27. Geology and Stratigraphy of Kashmir; Index. Total contents - 398 pages.

The book divides India into three main geological divisions - the triangular plateau of the peninsula, the mountainous or the extra-peninsular region bordering India on the west north and east, and the Indo-gangetic plain extending from the valley of the Indus to the valley of the Brahmaputra in Assam. The desert region of western Rajasthan is considered to be a unique fourth category, as it combines characteristics of two of the three main divisions.

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Geology of India - DN Wadia - Macmillan publishers (1919)11.97 MB
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Arghyam

6.22-2011.07.01-06