日本新第三紀哺乳類のRangeについて

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The geological range of land mammals in the island or peninsular environment as seen in the Japanese Neogene is much different from that in the continental region. It is more or less reduced from the range in the continent. The Hiramaki and Akashi faunae in the Japanese Neogene are the only ones abounding in land mammals. The former ranges from the Nakamura to the Shukunohora formations (BLOW's N7-N9). Occurrence of Japanese proboscidea in ascending order of horizons is as follows: Gomphotherium annectens, Trilophodon sendaicus, Stegolophodon elephantoides and Stegodon sugiyamai. Stegolophodon has a long lange in Japan. So Japan might have been its native region. Anchitherium (N8) and Hipparion (?) (N18) may be significant in the inter-continental correlation. Various kinds of cervids make their appearance in the Akashi fauna. If the Ashiya transgression of north Kyushu took place in N6, it might have been a very effective disturbing factor of land mammalian migration by way of the Korean land bridge to Japan. Cetacea are very rich in the marine Neogene of Japan and important as pelagic migrants from the other regions of the Pacific Ocean. We know the successive occurrence of Patriocetus (N6-N7), Kentrionodon (N9), Sinanodelphis (N17, N18). Kogia, Grampus (N20) and Pseudorca (N22), etc. Pinnipeds are known as the cold water elements. Eumetopias and Hydrodamalis (N21) are among them Desmostylus and Paleoparadoxia range from N8 to N15, covering the whole period of middle Miocene, thus their beginning and ending are ascertained in Japan.
日本地質学会の論文
1973-03-31

日本新第三紀哺乳類のRangeについて

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