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Dead by degrees; articulate brachiopods, paleoclimate and the Mid-Carboniferous extinction event

Anne C. Raymond, Patricia H. Kelley and Carol Blanton Lutken
Dead by degrees; articulate brachiopods, paleoclimate and the Mid-Carboniferous extinction event
Palaios (April 1990) 5 (2): 111-123

Abstract

The mid-Carboniferous extinction event is a relatively minor mass extinction, probably caused by the onset of continental glaciation in the Southern Hemisphere. Changes in Paleozoic paleoclimate are difficult to trace because there is no coherent isotopic history of Paleozoic ocean temperature. However, the migration patterns of Northern Hemisphere articulate brachiopods during the early and middle Carboniferous suggest that high-latitude warming occurred between the middle and late Visean and that both high-latitude cooling and equatorial warming occurred at the time of the mid-Carboniferous extinction event in the early Namurian. Visean high-latitude warming may have been caused by the collision of Laurussia and Gondwana, which deflected warm currents north and south along the east coast of Pangaea. Namurian high-latitude cooling coincided with the onset of Southern Hemisphere glaciation. For articulate brachiopods in the Northern Hemisphere, rates of generic extinction increased during the time of high-latitude cooling and glacial onset (Namurian A). The extinction event began earlier (late Visean) in the Southern Hemisphere and may have been more severe. Immediately following the mid-Carboniferous extinction event, the rate of generic origination in both equatorial and nonequatorial latitudes rose as brachiopods radiated within the newly-established climatic zones. Marine invertebrates showed similar patterns of migration and evolution associated with glacial onset in the Miocene, which suggests that the patterns of faunal migration and evolution associated with glacial onset are predictable, and can be used to identify the cause of similar mass extinctions.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 5
Serial Issue: 2
Title: Dead by degrees; articulate brachiopods, paleoclimate and the Mid-Carboniferous extinction event
Affiliation: Tex. A&M Univ., Dep. Geol., College Station, TX, United States
Pages: 111-123
Published: 199004
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 57
Accession Number: 1990-062599
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, sketch map
Secondary Affiliation: Univ. Miss., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 1990
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