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