RAS PRE GEOLOGY SYALLBUS

Geology (Code No. 16)

I. Physical Geology and Geomorphology :
Solar system, the earth, its origin, age and internal constitution. Weathering and
erosion. Geological work of river, glacier, wind, ocean and ground water. Types,
products and distribution of volcanoes. Causes, effects and distribution of earthquakes.
Morphology of continents and oceans. Elementary idea of isostasy, continental drift,
sea floor spreading and plate tectonics. Iceages, past climates and coral reefs.
Land forms, their types and relation to lithology and deformation Geomorphological
sub division of India.
II. Structural Geology and Geotectonics and Structure and Tectonics of India:
Dip, strike, pitch and plunge; Clinometer Compass. Determination of top of beds.
Description and classification of folds, faults, unconformities and joints. Cleavage,
schistosity, foliation and lineation. Igneous intrusives and extrusive bodies. Overlap,
offlap, outliers and inliers. Major tectonic sub divisions of India and their characteristics.
Origin of Himalayas, Indoganetic plains and deserts in India.
III. Palaeontology, Principles of Stratigraphy and Geology of India :
Mode of preservation and utility of fossils. Elementary idea of organic evolution.
Morphology and geological distribution of Graptoloidea, Echinoidea, Gastropoda,
Lamellibranchia, Trilobita, Brachiopoda, Cephalopoda and Foraminifera.
A brief study of Gondwana plant fossils and Siwalik fauna; elementary; idea of
evolution of man, elephant and horse, Standard stratigraphic time scale, principles of
stratigraphic correlation and knowledge of stratigraphic classification.
Study of Precambrian, Palaeozoic Mesozoic and Cenozoic rocks of India.
IV. Crystallography and Mineralogy :
Law of crystallography, elements of crystal symmetry, crystallographic notations and
twining. Study of forms and symmetry elements of normal classes of various crystal
systems. Contact goniometer. Crystal bonding and internal structure of crystals.
Physical, chemical and optical characteristics of important silicate mineral groups.
viz., Quartz, Felspar, Felspathoid, Olivine, Pyroxene, Amphibole, Mica, Chloride and
Garnet. Structure of silicate minerals. Physical properties and chemical composition of
important ore minerals. Petrological microscope, micol prism, birefringence,
pleochroism, extinction, uniaxial and biaxial characteristic of minerals. Optical signs.
V. Igneous, Sedimentary and Metamorphic Petrology :
Composition of magmas. Forms, structure, textures and classification of igneous
rocks. Phase rule, crystallisation of unicomponent and bicomponent silicate melts.
Crystallisation of common basaltic magma. Bowen's reaction series, magmatic
differentiation and assimilation. Petrography and petrogenesis of common igneous rocks.
Sedimentary processes, lithification and diagenesis. Heavy minerals. Structures,
textures, classification and depositional environment of sedimentary rocks. Physical
parameters of sedimentary grains. Petrography and petrogenesis of important sedimentary
rocks.
Agents, kind, depth zones, facies and grades of metamorphism. Structures, textures
and classification of metamorphic rocks. Petrography and petrogenesis of important
metamorphic rocks.
VI. Economic Geology and Applied Geology :