Present status of studies on Silurian Trilobites and cephalopods in Japan.

要旨

Since an Encrinurus had been described from the Southern Kitakami mountains by Sugiyama in 1941, additional occurrences of Silurian trilobites were reported from Gionyama of Kyushu, Mt. Yokokura of Shikoku, Hitoegane of the Hida plateau and other places and Kobayashi and Hamada have published a monograph on Silurian Trilobites of Japan in 1974. Recently additional trilobites amplified the Japanese fauna besides Silurian cephalopods from Mt. Yokokura. All of these fossils are in a range from Wenlockian to Ludlovian, if not from middle Wenlockian to middle Ludlovian. Encrinurus and other fossils reveal affinities to the fauna of the Mongolian geosyncline on one side and to eastern Australian one on the other. The Silurian cephalopods indicate the faunal connection from Japan to Bohemia through South China and Turkestan.

主題