File:Pseudorthoceras sp. (fossil cephalopod) (Lower Mercer Limestone, Middle Pennsylvanian; Rock Cut, Muskingum County, Ohio, USA) 4 (34373732065).jpg

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Description

Pseudorthoceras sp. - straight-shelled fossil nautiloid in fossiliferous limestone in the Pennsylvanian of Ohio, USA.

Nautiloids are squid-like creatures that construct long and slightly tapering or coiled, aragonitic, hollow shells with regularly-spaced internal walls. In the fossil record, the original aragonite shell has usually dissolved away, leaving an internal mold (an impression of the shell's interior). Nautiloids were relatively common components of Paleozoic oceans. Most species had straight, slightly tapering shells, but some had loosely coiled or tightly coiled shells. The entire group is represented in today's oceans by five living species of chambered nautilus, all of which have a coiled shell: Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus.

This photo depicts an internal mold of a Pseudorthoceras nautiloid, which had a fairly narrow, slightly tapering shell.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea (or Orthoceratoidea), Pseudorthocerida, Pseudorthoceratidae

Stratigraphy: Lower Mercer Limestone, Pottsville Group, Atokan Stage, lower Middle Pennsylvanian

Locality: Rock Cut railroad cut - large talus block along Ohio Central Railroad tracks (west of milepost 134), ~southwest of Copeland Island & south-southeast of the town of Dresden, northern Muskingum County, eastern Ohio, USA (~vicinity of 40° 04’ 24.41” North latitude, ~81° 59’ 11.25” West longitude)
Date
Source Pseudorthoceras sp. (fossil cephalopod) (Lower Mercer Limestone, Middle Pennsylvanian; Rock Cut, Muskingum County, Ohio, USA) 4
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34373732065. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

24 June 2017

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current17:39, 24 June 2017Thumbnail for version as of 17:39, 24 June 20173,724 × 2,154 (6.83 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via Flickr2Commons

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