File:Graftonoceras fossil nautiloid (Lockport Dolomite, Middle Silurian; Coldwater, southern Mercer County, western Ohio, USA) (15054984258).jpg

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Summary

Description

Graftonoceras - limonite-stained external mold in dolostone (public display, OSU 24835, Orton Geology Museum, Ohio State University, Columbus, 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 three living species of chambered nautilus - Nautilus pompilius, Nautilus macromphalus, and Allonautilus scrobiculatus.

This external mold of a Graftonoceras nautiloid has a coiled shell. The pattern of its original shell ornament, consisting of curvilinear waves, is still preserved.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Tarphycerida, Trocholitidae

Stratigraphy: Lockport Dolomite, Niagaran Series, Middle Silurian

Locality: unrecorded locality (probably a quarry) at or near Coldwater, southern Mercer County, western Ohio, USA
Date
Source Graftonoceras fossil nautiloid (Lockport Dolomite, Middle Silurian; Coldwater, southern Mercer County, western Ohio, USA)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15054984258. It was reviewed on 18 November 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

18 November 2014

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