File:Eurypterus lacustris (fossil sea scorpion) (Bertie Group, Upper Silurian; Ridgemount Quarry, Ontario, Canada) (36011768825).jpg

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Eurypterus lacustris Harlan, 1834 - fossil sea scorpion in dolostone from the Silurian of Ontario, Canada.

The eurypterids, or sea scorpions, are an extinct group of chelicerate arthropods. They have an elongated, scorpion-like body that could reach enormous sizes (2.5 to 3 meters!), with a nonmineralizing exoskeleton composed of chitinous material. They are generally found in shallow to very shallow water marine and marginal marine facies.

Eurypterus lacustris is a classic example of this bizarre group of creatures. It, and other eurypterid species, is well represented in the famous Bertie Dolomite of Ontario and New York State. The host rock is fine-grained dolostone (dolomudstone).

Classification: Animalia, Arthropoda, Chelicerata, Merostomata, Xiphosura, Eurypterida, Eurypteridae

Stratigraphy: Williamsville Formation or Fiddlers Green Formation, Bertie Group, Upper Silurian

Locality: Ridgemount Quarry, near the town of Fort Erie, Bertie Township, Welland County, far-southeastern Ontario, southeastern Canada

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en.wikipedia.org/wiki/Eurypterus
Date
Source Eurypterus lacustris (fossil sea scorpion) (Bertie Group, Upper Silurian; Ridgemount Quarry, Ontario, Canada)
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@N05/36011768825 (archive). It was reviewed on 29 March 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

29 March 2018

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current21:41, 29 March 2018Thumbnail for version as of 21:41, 29 March 20182,207 × 3,692 (6.13 MB)Magnus Manske (talk | contribs)Transferred from Flickr via #file_candidates

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