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amphibole amygdaloidal appears assemblage associated bands basalts base bearing beds biotite Cave cent chambers chondrules closely collected colour common contain Cretaceous crystals Cushman deposits described dipping distinct district dune sands east exposed felspar Figured flows folds formations G.S.I. Type Geol Geological grade grains granites grey Hard heavy minerals hematite hills ilmenite India indicate joints khondalite kilometres laminations length less limestone locality lower magnetite mainly manganese manganese-ore manganiferous marked massive material metamorphism metres minor northern noticed occur olivine outcrop phenocrysts places porphyritic portion present quartz quartzites range recorded region represented ridge river rocks rounded rutile samples sand dunes sediments seen side siliceous sillimanite similar species specimen stage strike structure suggests TABLE Test thickness thin trap trend usually Utatur varies veins vesicular Volume width zircon