Biostrome

Japanese: biostrome
Biostrome

...In the case of fossil beds, the origin of the beds is emphasized, as they share a common bedding plane with the surrounding non-fossil areas, indicating that the two formed simultaneously. There are also bioherms and biostromes, which are classified based on morphology and fossil content. Bioherms are mound-, dome-, lenticular-, or reef-shaped rock masses, composed mostly of the calcareous remains of sessile organisms such as corals, crinoids, foraminifera, mollusks, and stromatoporoidea, and are surrounded by sedimentary rocks of a different rock type.

*Some of the terminology that mentions "biostrome" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…化石床の場合は,周囲の無化石の部分と共通の層理面をもっていて,両者が同時的に形成されたことを示すというその成因が重視されている。また形態や化石内容に基づいたものにバイオハームbiohermとバイオストロームbiostromeがある。バイオハームは塚状,ドーム状,レンズ状または礁状の岩塊で,ほとんどサンゴ,ウミユリ,有孔虫,軟体動物,層孔虫のような固着性生物群の石灰質の遺骸で構成されており,周囲を違った岩質の堆積岩で取り囲まれているものを指す。…

※「biostrome」について言及している用語解説の一部を掲載しています。

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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