岐阜県上部シルル系一重ヶ根層の層序と新平湯地域の新露頭産オーロポーラ目床板サンゴ類

概要

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A new outcrop of the Hitoegane Formation in the Shinhirayuonsen area, Takayama-shi, Gifu Prefecture is discovered, resulting in a stratigraphic redefinition of the formation as the Late Silurian (mainly Ludlow) shallow marine succession. Fossiliferous limestone (biolithite and bioclastic wackestone), tuffaceous sandstone and shale are principal constituents of the formation, whose thickness ranges 40-50 m, but its original thickness was in excess of those amounts. The auloporid tabulate corals in the present new locality are described. They are Aulopora? sp. indet., Syringoporella yamakoshii Niko, 2001 and Aulostegites? sp. indet. Among them, S. yamakoshii is a common species with the type locality of the formation.