北上山地南部の坂本沢累層からのペルム紀四放サンゴの一新種

概要

論文の詳細を見る
The Sakamotozawa Formation exposed in Hikoroichi Town of Ofunato City, Iwate Prefecture, southern Kitakami Mountains is well-known to one of the standard lithogenetic units of the Lower Permian System in Japan. The formation consists mainly of well-bedded and dark colored limestone; it is subdivided into Sa to Sc members in which the detailed biostratigraphic subdivisions are established by a comprehensive account of fusulinaceans. The occurrence of rugose corals is rare but several characteristic species have been documented in this formation. During the recent quarry operation by the Ryushin Mining Co. Ltd., many large colonies of Wentzellophyllum are collected from limestone of the lower part of Sc member of the Sakamotozawa Formation. The corals are identified as a new species of Wentzellophyllum, W. pacificum that is described herein. This species probably represents one of the primitive forms in about 50 described species of this well-known genus.
国立科学博物館の論文
2004-12-22