Stratigr- aphy of the mount Jolmo Lungma region in southern Tibet，China

This paper, based on the material of the scientific expeditions to the Mount Jolmo Lungma region made during the years 1966—1968, deals briefly with the Ordovician, Silurian and Devonian marine strata discovered for the first time there, as well as their classifications and correlations. The marine strata, about 10,000 m in thickness and ranging from Ordovician to old Tertiary, were deposited almost continually. The fossils were abundant, being more than twenty kinds in all, and some were discovered for the first time in the Mount Jolmo Lungma region, or even in the Himalayas. The stratigraphical development of the southern part of the Mount Jolmo Lungma region is quite different from that of the northern: in the former, strata ranging from the Ordovician to the old Tertiary were exposed more completely, and the sediments seem to be of the so-called platform type; while in the latter, only the Permo-carboniferous and Mesozoic were seen, and the sediments there resemble those of the so-called geosycline type.