5.2 Inch Fossil Priscacara From 18 Inch Layer

This is a nice 5.2 inch specimen of the very elegant looking Cockerellites liops from Wyoming. It was collected from the 18 inch layer of the Green River Formation which yields the best, dark colored preservation. Fossils from this layer are much more valuable than the ligher colored ones from the "split fish" layers.

The 5 inch Priscacara displays wonderful detail, with all the fins, spines and bone structure present. It is centered on a large rectangularly shaped slap of shale. This is really a great display specimen of probably the most aesthetically pleasing fish from the famous Green River Shale.

The matrix on this fish was broken in shipping from the supplier and glued back together, hence the reduced price.

Cockerellites liops is a species of extinct temperate bass found in the Eocene aged Green River Formation of Wyoming. It is characterized by a sunfish-like body and its stout dorsal and anal spines. Originally it was placed in the Priscacara genus but was moved to the newly created genus Cockerellites by D. Jordan and H. Hanibal in 1923. There is still some debate among researchers about whether this new genus is valid.

Cockerellites is found in large numbers in mid-lake deposits, representing 5-20% of the fish unearthed (depending on the layer). It's considerably rarer in shoreline deposits, representing 1-2% of the fish found. Because of this, Cockerellites is thought to have been a schooling fish. They are known to attain a maximum size of about six inches, but rarely exceeds five inches in length.

At first glance Cockerellites liops has a very similar appearance to the rarer species, Priscacara. Size can often be used as a differentiator as Cockerellites did not exceed 6 inches while Priscacara serrata is typically found in excess of 6 inches. Cockerellites also had more dorsal and anal fin rays than Priscacara and a much smaller mouth.
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DETAILS
SPECIES
Cockerellites liops
LOCATION
Kemmerer, Wyoming
FORMATION
Green River Formation
SIZE
5.2" long on 9.5x6 plate
CATEGORY
ITEM
#276
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