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Echinosphaerites
释义
Echinosphaerites
fossil genus
genus of cystoids, an extinct group related to the sea lily and starfish, found as fossils in Ordovician marine rocks (between 505 and 438 million years old). It is a useful guide, or index, fossil for Ordovician rocks and time.
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更新时间:2025/2/19 16:46:08