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- W2356996924 abstract "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.The 'microbes+Calathium+sponges' assemblage was particularly common in shallow marine carbonate environments of the Tremadocian to Floian(Early Ordovician).However in the succeeding Dalpingian Stage(early Middle Ordovician) the sponge component declined in relative abundance so that reef mounds then became dominated by 'microbes+Calathium' only.In the Darriwilian Stage(late Middle Ordovician),this kind of reef was very limited in temporal and spatial distribution,and only occurred in the Tarim Block.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.The habit,or 'framework profile',of Calathium was favourable for entrapment of bioclastic and clastic debris,which enhanced the positive profile of reef mounds.Generally speaking,Calathium reef mounds formed patch reefs.The reef base was formed at the stabilization stage,followed by the reef core at the early stages of colonization and diversification-represented mainly by Calathium and/or sponge bafflestones and microbial bindstones.Profiles of reef core facies,inter reef facies and/or reef flank facies are clearly differentiated.Allochthonous fragments of Calathium also sometimes formed organic shoals over a wider area." @default.
- W2356996924 created "2016-06-24" @default.
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- W2356996924 date "2011-01-01" @default.
- W2356996924 modified "2023-09-23" @default.
- W2356996924 title "EARLY-MIDDLE ORDOVICIAN CALATHIUM REEF MOUNDS:HISTORY AND PALAEOECOLOGY" @default.
- W2356996924 hasPublicationYear "2011" @default.
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