18.0" Fossil Fish (Diplomystus) From 18 Inch Layer - Top Quality

This is an absolutely gorgeous 18.0" long Diplomystus dentatus from the famous 18 inch layer of the Green River Formation near Kemmerer, WY. The preparation in this piece is excellent. It's nicely centered on an unbroken 20.4x13" slab of shale, and the preservation is dark and detailed. It is a truly top quality Diplomystus.

This specimen is backed with plywood an equipped with a french cleat hanger. This is done to stabilize the fossil and to make hanging easier and safer.

It comes from the coveted 18 inch layer of the Green River Formation which produces darker and more detailed fish than the majority on the market. The rock from this layer is much harder and more durable. This layer is typically collected at night using low angle light to see the bump in the rock that the back bone creates. They then cut these fish out and take them to a lab where the fish which may be up to an inch under the surface of the rock are meticulously extracted under microscope with hand tools.

50 million years ago, in the Eocene these fish thrived in Fossil Lake fed by Uinta and Rocky Mtn. highlands. The anoxic conditions at the bottom of Fossil Lake slowed bacterial decomposition, prevented scavengers from disturbing corpses, and most interestingly, suffocated creatures that ventured into the oxygen-starved aquatic layer. The result is a miraculous exhibition of Eocene biota in a subtropical, aquatic community within sycamore forests teeming with creatures such as freshwater stingrays, dog-sized horses, menacing alligators, early flying bats, and one of the first primates.
Diplomystus dentatus
Kemmerer, WY
Green River Formation, 18 Inch Layer
18.0" fish on 22 x 11" shale
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