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Knightia alta

North America

A large Knightia fish fossil plate from Wyoming.

Code:USA009

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Availability: till 15 working days

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A large Knightia fish fossil plate from Wyoming. This fish is from the Green River Formation(55 million years ago). It is an ancestor of the Herring. The fish is centered well on the matrix and has very nice detail. Approximate size of the fish is 7,2 cm long and 2,1 tall. Matrix piece is approximately 14,0 x 13,7 cm.


Knightia is an extinct genus of fish well-known from abundant fossils found in the Green River Formation of Wyoming, United States. They rarely exceeded (20-25 cm) in length and are found throughout the formation. Knightia is the state fossil of the state of Wyoming.


Knightia was a slender fish and seems to have been a secondary consumer, feeding mainly on ostracods, algal forms and diatoms, as well as some smaller fish. They were schooling fish, and because of this they are frequently found together in mass mortality layers.


United States of America
Kemmerer, Wyoming
14,0x13,7x1,2 cm
374.2g

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