Fossil Fish

Most of our fish come from the Green River Formation located in Southwestern Wyoming, and are Eocene in age. The Green River Formation is a fossil lagerstatte caused by anoxic conditions in prehistoric lakes that allow for the phenomenal presentation you see here. The formation has several layers, but the two most common commercial layers are the split fish layer and the 18-inch layer; the former produces brown to orange fossils with good definition, and is typically prepared using sharpened files, while the 18-inch layer is harder and typically darker in color, and requires significantly more manpower when it comes to prepping. The results, however, show that it’s worth the effort!

Fine Knightia eocaena


$8 per specimen

These are well-preserved Knightia eocaena with good bone detail and preservation, and are perfect for novice collectors or nascent paleontologists! These fossils are fifty one million years old, and are great for teaching about fossilization with a complete fish. Specimens average 2-3″ long on 3-4″ matrix, but some pieces may be a bit larger. All of our Knightia are from the split fish layer of the formation.

Excellent Knightia eocaena


$15 per specimen

These are exceptionally preserved Knightia eocaena with great bone and fin detail, and are suitable for the discerning collector looking to expand their collection. These specimens average 3-4″ on 4-6″ long matrix, but some pieces may be on a larger matrix.

Study Grade Knightia eocaena


$3 per specimen

These Knightia fish from the Green River Formation are excellent for teachers to show the preservation or comparative collections for invertebrate fans. These specimens are incomplete or have damage, but show the excellent preservation of the site on a budget! Specimens average 2-3″ long on a similarly sized matrix, although some pieces may be bigger. If you have specific requests please let us know; discounts are available for educators.

Fine Diplomystus dentatus


$15 per specimen

Less common than the Knightia, Diplomystus was a predatory fish in the Eocene lakes of the Green River formation. These examples measure 3-4″, though some may be larger, and have good bone detail and preservation perfect for an advancing collector interested in vertebrate fossils. All of our Green River fossils, unless otherwise stated, have no coloration or repair, and these Diplomystus are no exception!

Well Preserved 6″ Diplomystus dentatus



This is an affordable example of a larger Diplomystus dentatus from the Green River Formation. This piece has great bone definition and strong preservation overall, and is situated aesthetically on a large matrix excellent for display. At six inches long, this is a larger example from the split-fish layer, though Diplomystus can exceed 20″ in length!

Large, Excellent Diplomystus dentatus



This phenomenal Diplomystus measures nearly 19″ long, and comes from the 18-inch layer of the Green River Formation. This piece offers excellent details and fine preservation, but the preparation is what makes it an exceptional display piece. The matrix has been cut and polished to outline and accent the fish, which would be at home in any study, kitchen, or library. We are happy to provide more pictures upon request.

Heliobatis radians Partial Stingray

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One of the most prized fossils from the Green River Formation, Heliobatis radians is a stingray perfect to round out otherwise complete collections as will as excellent, and unusual, display. This stingray is a large example with good articulation, measuring 10″, though it is incomplete. It displays wonderfully as it is, and is available for the fraction of a price of a complete specimen. It has been repaired around the edges of the rock, which has been stabilized. There is a complete, well-preserved Knightia eocaena on the back, just adding to an excellent piece.