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Description: | Specimen of a fossil fish, Knightia alta, collected from the Green River Formation of Tertiary, Early - Middle Eocene, Ypresian - Lutetian (?) age from Green River, Wyoming, U.S.A.. Collected by David M. Lumsden. Single well preserved fish on slab of calcareous mudstone.
This freshwater fossil fish comes from Green River in the USA, one of the worlds 'super fossil sites'. It is the state fossil of Wyoming and was named after the first state geologist, Wilbur Clinton Knight. Knightia is a relative of the present day herring and grew to a length of 10 to 25 centimetres. The fish population died out suddenly when oxygen levels fell dramatically. This is the reason that large numbers were preserved in the fine-grained lake sediments.
The specimen was found in USA.
It is from the Tertiary period (65 - 1.8 million years ago) | Publisher: | Tyne & Wear Archives & Museums | Subjects: | David M. Classification: Chordata Pisces Lumsden | Temporal: | Tertiary period (65 - 1.8 million years ago) | Source: | Tyne & Wear Archives & Museums | Identifier: | http://www.twmuseums.org.uk/geofinder/se... | Go to resource |
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