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Shark-bitten vertebrate coprolites from the Miocene of Maryland
Authors:Stephen J Godfrey  Joshua B Smith
Institution:1. Department of Paleontology, Calvert Marine Museum, P.O. Box?97, Solomons, MD, 20688, USA
2. American Institutes for Research, 1000 Thomas Jefferson Street, NW, Washington, DC, 20007-3835, USA
Abstract:Coprolites (fossilized feces) preserve a wide range of biogenic components, from bacteria and spores to a variety of vertebrate tissues. Two coprolites from the Calvert Cliffs outcrop belt (Miocene-aged Chesapeake Group), MD, USA, preserve shark tooth impressions in the form of partial dental arcades. The specimens are the first known coprolites to preserve vertebrate tooth marks. They provide another example of trace fossils providing evidence of prehistoric animal behaviors that cannot be directly approached through the study of body fossils. Shark behaviors that could account for these impressions include: (1) aborted coprophagy, (2) benthic or nektonic exploration, or (3) predation.
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