Fossils of polychaetes found from the Lower Miocene Shirahama Formation of Tanabe Group, in Wakayama Prefecture, Southwest Japan

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  • 和歌山県の中新統田辺層群白浜累層下部より産出した多毛類化石
  • ワカヤマケン ノ チュウ シントウタナベソウグン シラハマルイソウ カブ ヨリ サンシュツ シタ タモウ ルイカセキ

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Abstract

The writers discovered abundant fossils of polychaetes from the Lower Miocene Shirahama Formation of the Tanabe Group in the southwestern part of Kii Peninsula. Wakayama Prefecture, Southwest Japan. The formation mainly consists of alternation of sandstone and mudstone, sandstone and conglomerate. The fossils have been occured from the mudstone of the alternation in the S1 Member which is the basal part of the formation. Many trace fossils have been discovered from the same horizon. The mode of the occurence are classified into three types as follows: Type I shows the outersurface of the body, Type II buried with oblique posture and Type III shows specimen exposing the inner structure of the body. Morphological characters of these fossils are shown by cylindrical and string-like form and are ellipsoid to round in the section of the body. Many segments and parapodia on both sides of each segment are well developed in the body. From the many characters of these fossils described here, the writers identified to a kind of family of the order Phyllodocida, but the family and genus names are not known.

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