This is an excellent 50 million-year-old plate of fossil fish from the world-famous Green River Formation of Wyoming. The plate is from the 3/32 Ash Layer, hence its lovely reddish color, and features three fish and the faint impression of a fourth. Two of the fish are of the genus Knightia and one is of the genus Diplomystus. This fossil plate was personally collected by Ruby Lane shop owner Bryan Roberts from a private quarry in the Kemmerer, Wyoming area and measures 9" x 10.25". The longest fish is approximately 3.5" long and all of the specimens exhibit amazing detail and preservation. The plate comes with an acrylic display stand and makes an impressive display piece as an objet d'art. It would also make a wonderful unique gift, however, for a child or grandchild who is interested in fossils, dinosaurs, or geology.
A note on the geology: The Eocene-age sediments of the Green River Formation were laid down in a massive lake that was located in what is now southwest Wyoming. The 3/32" Ash Layer represents a volcanic event that caused an expansive mortality event. As a result, most pieces of the 3/32 Ash Layer have multiple specimens and thus is highly prized by collectors. Because it is a single thin layer, however, access to it is often hard to obtain. Although fish are the best-known fossils from the formation, crustaceans, amphibians, plants, insects, fresh water skates, and even birds and bats have been found. All in all, the Green River Formation represents the best record of a Cenozoic lake ecosystem ever discovered.
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