File:Acanthotelson stimpsoni fossil shrimp (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA).jpg

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Acanthotelson stimpsoni Meek & Worthen, 1865 fossil shrimp from the Pennsylvanian of Illinois, USA (public display, FMNH PE 37647, Field Museum of Natural History, Chicago, Illinois, USA).

One of the most remarkable soft-bodied fossil deposits (lagerstätten) on Earth is the Pennsylvanian-aged Mazon Creek Lagerstätte near Chicago, Illinois. In the Mazon Creek area, the Francis Creek Shale consists of concretionary gray shales. The Francis Creek concretions are composed of argillaceous ironstone, and can be fossiliferous or nonfossiliferous. The fossiliferous concretions contain land plants and terrestrial & marine animals, including nonmineralizing organisms.

This Acanthotelson stimpsoni specimen is a dorso-ventrally compressed fossil shrimp in a Mazon Creek concretion.

Classification: Animalia, Arthropoda, Crustacea, Eumalacostraca, Syncarida, Acanthotelsonidae

Stratigraphy: Mazon Creek Lagerstätte, Francis Creek Shale Member, Carbondale Formation, Desmoinesian Stage (= Westphalian D), upper Middle Pennsylvanian

Locality: coal mine dump pile near Essex, northern Illinois, USA
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Source Acanthotelson stimpsoni fossil shrimp (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA)
Author James St. John
This file supersedes the file Acanthotelson.jpg. It is recommended to use this file rather than the other one.

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15342558987. It was reviewed on 21 November 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

21 November 2014

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current19:42, 21 November 2014Thumbnail for version as of 19:42, 21 November 20141,028 × 1,916 (1.51 MB)Animalparty (talk | contribs)Transferred from Flickr via Flickr2Commons

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