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File:Mioplosus labracoides & Knightia eocaena fossil fish (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) (15521638032).jpg

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Mioplosus labracoides & Knightia eocaena fossil fish in lacustrine marlstone from the Eocene of Wyoming, USA (~28.5 cm across).

The Green River Formation of Utah-Colorado-Wyoming is famous for having vast oil shale deposits and for having exquisitely-preserved fossils. Fossil Butte National Monument in southwestern Wyoming preserves and displays some of these high-quality fossils. Leaves and fish are the most common large fossils in the Fossil Lake Basin of the Green River Fm.

This fossiliferous marlstone has a fossil fish mass mortality surface. Such bedding planes are moderately common in the Green River Formation's Fossil Butte Member. The large fish is Mioplosus labracoides, a fossil perch. The nine smaller fish surrounding the Mioplosus are Knightia eocaena, which are fossil herrings.

Stratigraphy: Eighteen Inch Layer, Fossil Butte Member, Green River Formation, upper Wasatchian Stage (Wa4)/Ypresian Stage/Lostcabinian, Lower Eocene

Locality: Fossil Lake Basin, southwestern Wyoming, USA.
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Source Mioplosus labracoides & Knightia eocaena fossil fish (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA)
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@N05/15521638032 (archive). It was reviewed on 15 January 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 January 2019

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current09:15, 15 January 2019Thumbnail for version as of 09:15, 15 January 20192,566 × 1,995 (1.56 MB)Animalparty (talk | contribs)Transferred from Flickr via #flickr2commons

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