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Stasis and extinction of Silurian (Llandovery–Wenlock) trilobite associations related to oceanic cyclicity

Published online by Cambridge University Press:  20 May 2016

Donald G. Mikulic  and
Joanne Kluessendorf
Donald G. Mikulic
Affiliation:
Illinois State Geological Survey, Champaign, Illinois 61820,
Joanne Kluessendorf
Affiliation:
Department of Geology, University of Illinois, Urbana, Illinois 61801,
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Abstract

Silurian trilobites of the central United States belong to a series of temporally-successive associations which appeared abruptly, maintained taxonomic stasis for a time, and then disappeared abruptly. Their disappearance resulted from global perturbations of short-term duration and moderate magnitude, which caused substantial taxonomic replacement but no reorganization of major ecosystems. The most significant extinction and replacement in Silurian trilobite associations in the study area occurs near the Llandovery–Wenlock boundary. This turnover in trilobite associations appears to correspond to Jeppsson's Ireviken Event in his model of oceanic and climatic cyclicity. Major sea-level changes earlier in the Llandovery did not have a similar impact on trilobite associations.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 2: Papers from the Second International Trilobite Conference, August 1997 , March 1999 , pp. 320 - 325
Copyright
Copyright © The Paleontological Society 

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