Large Ecosystem Perturbations: Causes and Consequences
Ecosystem perturbation caused by a small Late Cretaceous marine impact, Gulf Coastal Plain, USA
Published:January 01, 2007
David T. King, Jr., Lucille W. Petruny, Thornton L. Neathery, 2007. "Ecosystem perturbation caused by a small Late Cretaceous marine impact, Gulf Coastal Plain, USA", Large Ecosystem Perturbations: Causes and Consequences, Simonetta Monechi, Rodolfo Coccioni, Michael Rampino
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The Wetumpka impact event, ca. 83.5 Ma in shallow waters of the northern Gulf of Mexico, caused minor ecosystem perturbations because of the physical effects of a 2.6-gigaton-equivalent impact detonation. The impact event and its consequences had relatively minor, but notable, paleobiologic effects (i.e., preservational effects, biostratigraphic effects, and impact-succession effects). The impact structure served as a local reservoir for an impact-entombed fossil record in two main ways. First, coarse to fine fragments of terrestrial vegetation, probably derived from the adjacent tropical forest, were swept up and incorporated into Wetumpka washback- and surgeback-deposited breccias and sands. Second, intact blocks of...