TNPSC சிறப்பு பகுதி

                                                                                      GEOLOGY
                                                                        (U.G DEGREE STANDARD) 
UNIT I - GENERAL GEOLOGY
Origin, Interior and Age of the Earth - Weathering - Types and products - Geological
work of Wind, River, Sea and Groundwater - Volcanoes - Earthquakes - causes and
effects - Seismic zonation - Richter Scale - Principles of Plate Tectonics – fundamental
and geomorphology.
UNIT II – STRATIGRAPHY
Principles of Stratigraphy - Correlation - Geological Time Scale - General
characteristics, descriptive and economic importance of Archean, Cuddapah, Vindhyan
and Gondwana systems of Peninsular India -Cretaceous system of Tamil Nadu.
UNIT III - STRUCTURAL GEOLOGY
Folds - Faults - Joints - Unconformities - Recognition of overturned beds –Stress and
strain relationship – Attitude of beds – Measurement of dip, apparent dip, strike using
Cino and Brunton Compass .

UNIT IV - PALAEONTOLOGY
Fossils – Definitions, Conditions, mode of preservation, uses of Fossils – General
morphology and classification of Graptolites, Mollusca, Coelenterata, Brachiopod,
Trilobita, Echinoids and Foraminifera.
UNIT V – CRYSTALLOGRAPHY
Definition of crystals – Inter facial angles – Goniometer -Symmetry Elements - Study of
Normal Classes of Isometric, Tetragonal, Hexagonal, Orthorhombic, Monoclinic and
Triclinic systems - Twin crystals.
UNIT VI - MINERALOGY
Physical properties of minerals - Petrologcal Microscope and its parts, accessory plates
and uses – optical properties - Isotropic and Anisotropic Minerals - Descriptive study of
quartz and its varieties - Feldspar Group - Pyroxene Group - Amphibole Group - Mica
Group - Garnet Group - Descriptive study of Calcite, Dolomite, Tourmaline, Topaz,
Staurolite, Chlorite and Zircon. 

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