Bird nest fauna - Bird nest fauna

Japanese: 鳥巣動物群 - とりのすどうぶつぐん

A group of marine fauna that lived in the environment surrounding the coral reefs that developed on the Pacific coast of the Japanese archipelago in the Late Jurassic Period (approximately 150 million years ago). It consists of a variety of calcareous algae, reef-building corals that indicate warm waters, stromatoporoids, gastropods including Nerinea, bivalves, ammonites, brachiopods, sea urchins, and crinoids. The Torisu Group, whose type site is Torisu in the Sakawa region of Kochi Prefecture, is a stratum that contains many lenses of reef limestone (black and oily smelling) about 300 m long, and similar deposits and fauna are distributed in a narrow, elongated area from the Sakamoto region of Kumamoto Prefecture through southern Shikoku and the central Kii Peninsula to the Itsukaichi region of Tokyo, and further extends to the Soma region of Fukushima Prefecture.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ジュラ紀後期(1億5000万年前ごろ)に日本列島の太平洋岸に発達したサンゴ礁をとりまく環境に生息していた海生の動物群。多様な石灰藻，暖海を示す造礁性サンゴ，層孔虫，ネリネア類を含む腹足類，二枚貝，アンモナイト，腕足類，ウニ，ウミユリなどからなる。高知県佐川地方の鳥巣を模式地とする鳥巣層群は約300mの礁性の石灰岩(黒色で油臭がある)のレンズを多く含む地層で，同様の堆積物と動物群は熊本県坂本地方から四国南部，紀伊半島中部を経て東京都五日市地方に至る狭長な地帯に分布し，さらにその延長は福島県相馬地方に達している。

出典　株式会社平凡社世界大百科事典第２版について　情報

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