File:Petalodus ohioensis (fossil shark tooth) (Skelley Member, Upper Pennsylvanian; Noble County, Ohio, USA).jpg

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English: Petalodus ohioensis Safford, 1853 - fossil shark tooth from the Pennsylvanian of Ohio, USA.

This remarkable fossil fish tooth comes from the youngest fully marine unit in all of Ohio - the Skelley Member. The Skelley is one of several marine intervals in the Conemaugh Group, an Upper Pennsylvanian cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). The Skelley Member consists of a limestone facies and a shale facies. This fossil was apparently eroded from the shale facies.

The tooth is phosphatic - it is composed of apatite (calcium phosphate). It comes from Petalodus ohioensis, a Late Paleozoic shark. The tooth morphology of Petalodus indicates it was a shell crushing shark. Petalodus likely fed principally on calcareous shelled invertebrates such as brachiopods and bivalves.

Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Petalodontiformes, Petalodontidae

Stratigraphy: shale facies of the Skelley Member, upper Conemaugh Group, lower Virgilian Series, Upper Pennsylvanian

Locality: Noble County, eastern Ohio, USA

See info. on a Nebraska occurrence at:

gsa.confex.com/gsa/2013NC/webprogram/Paper218747.html
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Source https://www.flickr.com/photos/47445767@N05/34078593871/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34078593871. It was reviewed on 10 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 March 2020

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