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One point most interesting and important of theKoreo-Manchurian Ordovician is the striking contrastbetween the fauna of South Korea and that of North Korea and South Manchuria. The former bears an intimate relation with the Trilobite facies of the European Ordovician, while the latter shows decidedly an Arcto-American affinity. Lately I have studied a rich collection of the Cambrianand Ordovician fossils from South Korea belonging to the Korean Geological Survey, together with those of Mr. T. Shiraki and my owns; of these materials more than eighty species are distinguished in total and these are available for the stratigraphical correlation and the palaeogeographical study. The stratigraphical sequence observed in the environs of Mt. Tsuibon, Kogen-do, South Korea,is in descending order as follows:

Cambrian and Ordovician Faunas of South Korea and the Bearing of the Tsinling-Keijô Line on Ordovician Palaeogeography