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The Cambrian Substrate Revolution

Bottjer, David J. and Hagadorn, James W. and Dornbos, Stephen Q. (2000) The Cambrian Substrate Revolution. GSA Today, 10 (9). pp. 1-7. ISSN 1052-5173. http://resolver.caltech.edu/CaltechAUTHORS:20160711-142013440

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Abstract

The broad marine ecological settings prevalent during the late Neoproterozoic– early Phanerozoic (600–500 Ma) interval of early metazoan body plan origination strongly impacted the subsequent evolution and development of benthic metazoans. Recent work demonstrates that late Neoproterozoic seafloor sediment had well-developed microbial mats and poorly developed, vertically oriented bioturbation, thus producing fairly stable, relatively low water content substrates and a sharp water-sediment interface. Later in the Cambrian, seafloors with microbial mats became increasingly scarce in shallow-marine environments, largely due to the evolution of burrowing organisms with an increasing vertically oriented component to their bioturbation. The evolutionary and ecological effects of these substrate changes on benthic metazoans, referred to as the Cambrian substrate revolution, are presented here for two major animal phyla, the Echinodermata and the Mollusca.


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Additional Information:© 2000 Geological Society of America. Manuscript received May 9, 2000; accepted June 30, 2000. This contribution has benefited from numerous discussions over the years with M. Droser, A. Fischer, J. Gehling, A. Seilacher, W. Ausich, D. Gorsline, P. Myrow, F. Pflüger, J. Schieber, and B. Waggoner. Helpful reviews were provided by R. Bambach, L. Babcock, and M. Miller. Bottjer thanks J.W. Schopf and the University of California at Los Angeles Center for the Study of Evolution and the Origin of Life for support of this research. Hagadorn is grateful for postdoctoral fellowship support from J. Kirschvink and the Caltech Division of Geological and Planetary Sciences. Dornbos thanks GSA, the Paleontological Society, and the University of Southern California Wrigley Institute for Environmental Studies and Department of Earth Sciences for support.
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Record Number:CaltechAUTHORS:20160711-142013440
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ID Code:68968
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Deposited By: Tony Diaz
Deposited On:26 Jul 2016 23:51
Last Modified:26 Jul 2016 23:51

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