Early-Middle Ordovician Calathium Reef Mounds: History and Palaeoecology
详细信息
- 责任者：Wang Jianpo (Wuhan Center of Geological Survey ; Donghu ; Wuhan 430205 ; China) ; Li Yue
- 刊名：Acta Palaeontologica Sinica
- 出版年：2011
- 卷期：50(1)
- 关键词：造礁生物 ; reef builders ; 古生态学 ; paleoecology
- 页码：p.132-140
- 图表：illus., 44 refs.
- 分类号：1103
- 出版序号：20120381
- issnNo：ISSN0001-6616
- isbnNo：CN32-1188/Q
摘要
The receptaculitid genus Calathium is an extinct genus of sessile organisms of uncertain systematic position but which has most often been attributed to sponge or calcareous Green algae, having a somewhat similar appearance to dasyclads-which still survive at the present day. Calathium ranges in stratigraphic age from Ordovician to Silurian and is particularly notable because it played a major role in reef building during the Early and Middle Ordovician. The base of the Early Ordovician saw the initiation of a major new phase in composition of reefs within shallow marine carbonate settings-in which the mud mounds previously dominantly constructed by microbes became joined in varying proportions by Calathium and by a limited diversity of metazoans, mainly sponges-particularly siliceous lithistid sponges. Finally, reefs with Calathium-dominated eventually vanished in the Late Ordovician, at the same time as the innovation occurred of significantly more diverse metazoan reef communities including corals and stromatoporoid sponges-leading to still more developed and complex reef systems.
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