京都府夜久野地域の舞鶴層群産呉家坪期(後期ペルム紀)床板珊瑚類

概要

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A Wuchiapingian (early Late Permian) tabulate coral fauna occurs in impure limestone, what is called the "Takauchi Limestone", belonging to the Nukata Formation of the Maizuru Group in the Yakuno area, Kyoto Prefecture, Central Japan. Within the abundant, but relatively low in diversity, corals, three species are identified; namely Praemichelinia lii sp. nov. (Micheliniidae, Favositida), Yakunopora matsushitai gen. et sp. nov. (Pachyporidae, Favositida), and auloporid, gen. et sp. indet. (Auloporida). Among the previously known pachyporid genera closely resembling Yakunopora is Acaciapora. The most diagnostic feature of Yakunopora is the alternately arranged squamulae, whereas Acaciapora lacks such regularity in a squamula arrangement. The Takauchi fauna represents the youngest tabulate corals ever documented from Japan.
2005-12-22