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amphibole amygdaloidal analysis appears assemblage associated bands basalts base bearing beds biotite Cave cent chambers chondrules closely collected colour common contain convolute Cretaceous crystals Cushman deposits described dipping distinct district dune sands dykes east felspar Figured flows folds formations G.S.I. Type Geol Geological grade grains granites grey Hard heavy mineral hematite hills ilmenite India indicate joints khondalite kilometres laminations length less limestone lower magnetite mainly manganese manganese-ore manganiferous massive material metamorphism metres northern noticed occur olivine outcrop phenocrysts places plates portion present quartz quartzites range recorded REFERENCES 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