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- W2316988892 abstract "Abstract Stromatoporoid sponges first appeared during the late Mid-Ordovician (mid–late Darriwilian) accompanying an important ‘Chazy’ reef-building episode. Representatives of the order Labechiida appeared first, initially splitting into two sister groups: those from North China (nine genera) and those from Laurentia (four genera). Two genera were common to the two regions, but others in North China and Siberia were endemic. This initial provincialism was not maintained into the Late Ordovician (Sandbian) as labechiids attained a wider dispersal, covering Laurentia with peripheral terranes in Northwest Scotland and Chukchi Peninsula, cratonic Siberia, the Urals (eastern margins of Baltica), and East Gondwanan blocks of Tarim North China, marginal Tasmania and the peri-Gondwanan New South Wales island-arc terrane. Only a few endemics remained present in the Sandbian – three in Laurentia, and one in Tarim. In the Katian, maximum diversification of labechiids occurred (19 genera, including a genus possibly transitional to first actinostromatids). Also four genera of the Clathrodictyida first appeared, and overall distribution continued to increase. The Hirnantian marked a dramatic decline in the global distribution (only Anticosti Island, Manitoba, Norway and Estonia) and marked diversity loss of labechiids. Altogether c. 70% of stromatoporoid species disappeared in response to end-Ordovician global cooling events. Llandovery stromatoporoids were widespread in Laurentia, Baltica and Siberia, with clathrodictyids as dominant and labechiids accessory (the latter group more common in Siberia and China). Gradual diversification and expansion of stromatoporoids followed in the late Llandovery, with appearances of the orders Actinostromatida and Stromatoporida. The stromatoporoids became most widespread and most diversified during the Wenlock, with clathrodictyids maintaining their leading position, and the appearances of the earliest Stromatoporellida and Syringostromatida. Rapid spread of new phylogenetic stocks indicates that widespread pandemism prevailed among Wenlock stromatoporoids. The Ludlow was characterized by final closure of the Iapetus Ocean, accompanying uplift of palaeocontinental regions, and declining prominence of stromatoporoid-bearing shallow carbonate shelves. However, clathrodictyids and actinostromatids remained dominant, whereas the incoming of Amphiporida in several regions (Somerset Island, Baltic area, West Ukraine, West and East Urals, Novaya Zemlya, Tien Shan, Japan and New South Wales) and restricted distribution of some other taxa suggest a certain provincialism developed. With regional regression and stratigraphic hiatuses, the stromatoporoids (mostly hangovers from the Ludlow) became less common in the Pridoli, and apparently even entirely absent from Gondwana and Siberia." @default.
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- W2316988892 date "2013-01-01" @default.
- W2316988892 modified "2023-09-27" @default.
- W2316988892 title "Chapter 7 Biogeography of the Ordovician and Silurian Stromatoporoidea" @default.
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- W2316988892 doi "https://doi.org/10.1144/m38.7" @default.
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