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File:Sthenarocalymene celebra fossil trilobite (Cedarville Dolomite, Middle Silurian; Preble County, southwestern Ohio, USA) (15083687337).jpg

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Sthenarocalymene celebra (Raymond, 1916) fossil trilobite (3.45 cm long) in dolostone from the Silurian of Ohio.

This fossil calymenid trilobite specimen is a nice example of dissolution. The original calcareous exoskeleton has dissolved away, and the fossil is now preserved as an internal mold. The host rock is dolostone. Most trilobites found in dolostones are similarly preserved. This trilobite is Sthenarocalymene celebra (Raymond, 1916). Over the years, trilobitologists haven’t agreed on the proper generic assignment for celebra. The species has been variously assigned to the genera Calymene, Gravicalymene, Flexicalymene, and Sthenarocalymene.

Classification: Animalia, Arthropoda, Trilobite, Polymerida, Calymenidae

Stratigraphy: Cedarville Dolomite, upper Lockport Group, upper Niagaran Series (= upper Wenlockian), upper Middle Silurian.

Locality: unspecified locality (probably a quarry) in Preble County, southwestern Ohio, USA.

Many fossils of shelly organisms (e.g., bivalves, gastropods, brachiopods, cephalopods) have had the original hard parts dissolved away. In such cases of dissolution, the fossil itself is an impression of the outside of the shell (external mold) or an impression of the inside of the shell (internal mold).
Date
Source Sthenarocalymene celebra fossil trilobite (Cedarville Dolomite, Middle Silurian; Preble County, southwestern 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@N05/15083687337. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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current18:56, 6 May 2015Thumbnail for version as of 18:56, 6 May 20151,831 × 2,000 (2.31 MB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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