Upper Carboniferous Fusulinids from Mt. Maruyama, Mine City, Yamaguchi Prefecture

Abstract

The Middle to Upper Carboniferous Akiyoshi Limestone Group is widely distributed in the Mt. Maruyama area, Mine City, Yamaguchi Prefecture.

Limestones in this area are variable in their organic compositions, such as rugose corals, ammonoids, phylloid algae, brachiopods and fusulinids.

Lithologic facies and sedimentary features indicate a paleoenvironment of the reef flat or by-pass margin between the fore reef part of the Akiyoshi organic reef complex and open sea.

Locality MA66 is abundant in fusulinid species of primitive type- "Triticites". Four species, including three new ones can be discriminated as follows: Protriticites yanagidai Y. Ota, sp. nov., Protriticites masamichii Y. Ota, sp. nov., Protriticites toriyamai Y. Ota, sp. nov., and Protriticites aff. matsumotoi (Kanmera).