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amphibole amygdaloidal analysis appears assemblage associated band 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 hills ilmenite India indicate joints khondalite laminations length less limestone locality lower magnetite mainly manganese manganese-ore manganiferous massive material metamorphism metres northern noted noticed occur olivine outcrop phenocrysts places plates porphyritic portion present quartz quartzites range recorded REFERENCES region 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