Records of the Geological Survey of India, Volume 107The Survey, 1976 - Earthquakes Includes the Annual report of the Geological Survey of India, 1867- |
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Page 160
... nature are apparent in the depth range drilled . Each depositional cycle is represented by fine to medium sand at bottom through fine to very fine sand to yellow clay and caliche layers towards the top . At places , the sand formation ...
... nature are apparent in the depth range drilled . Each depositional cycle is represented by fine to medium sand at bottom through fine to very fine sand to yellow clay and caliche layers towards the top . At places , the sand formation ...
Page 18
... nature . Greyish to blackish varieties have iron ore permeated glassy base , the greenish or greenish grey varieties are epidotised . Alternately zeolitic and non- zeolitic flows appear , the latter being harder than the former , which ...
... nature . Greyish to blackish varieties have iron ore permeated glassy base , the greenish or greenish grey varieties are epidotised . Alternately zeolitic and non- zeolitic flows appear , the latter being harder than the former , which ...
Page 21
... nature is due to intense chloritisation of the rocks . Porphyritic variety of the trap appears only as gradations and it is difficult to say if they are separate flows as well . The porphyritic crystals are of chalcedony , felspar and ...
... nature is due to intense chloritisation of the rocks . Porphyritic variety of the trap appears only as gradations and it is difficult to say if they are separate flows as well . The porphyritic crystals are of chalcedony , felspar and ...
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amphibolite Andhra Pradesh Archaean bands basalt basin bauxite beds Bihar biotite block boreholes carried chalcopyrite chlorite clay Coalfield conglomerate copper cores Deccan Trap Delhi deposits depth Director district Division dolerite drilling epidote exposed felspar folds formation fossil galena geochemical Geol geological mapping Geological Survey Geologists Jr geophysical Ghosh Glossopteris Glossopteris flora gneiss gneissic complex Gondwana grade grained granite gneiss greenish greenstone belts grey Group hill holes horizon indicated investigation Kashmir Kurnool laterite limestone Lower mapped an area metamorphism mineralisation minerals occur Panjal trap pegmatite phyllite pits Project pyrite quartz quartz veins quartzite Quaternary Rajasthan Raniganj regional river rock types samples sand sandstone Sarvashri scale schist schistose seams sediments shale shear zone Shri Singh Siwalik spillway sq km Srivastava stratigraphic studies sulphide Survey of India thickness traverse trending tunnel unconformity Upper upto valley varies Vindhyan