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Found 6 results

  1. WildwoodWizard

    Green River Formation Identification help

    Hey there, this is my first post and my second big trip to go fossil hunting. Attached are what I think these fish are identified as, but I think I will need a bit of help seeing as I still have novice eyes. Any help on identifying or noticing differences between differe nt species would be incredibly helpful. These were found in Kemmerer Wyoming at one of the split quarries. Thanks!
  2. RobFallen

    Diplomystus dentatus

    From the album: Robs Fossil Collection

    Small Diplomystus dentatus fossil fish Green river formation, Wyoming USA Matrix size 9.5cm x 6cm x 1.7cm
  3. Fossildude19

    Diplomystus dentatus - gift from a friend

    From the album: Fossildude's Purchased/Gift Fossils

    A beautiful Diplomystus dentatus from the Green River Formation, Wyoming. This was a gift from my entirely too generous, good friend, Jeffrey P.

    © 2021 T.Jones

  4. Fossildude19

    Misidentified prep project

    From the album: Fossildude's Purchased/Gift Fossils

    I came upon this very inexpensive fossil on an auction site. It was misidentified as a Knightia eocaena. I could see it was actually a Diplomystus dentatus. (The thickened post cranial bones, the upward facing jaw, and the pectoral fin position were my clues.) I will be prepping this out shortly. I have a larger example that was given to me by Peat Burns, but I wanted something to practice on, first. This will be my first true Green River Fish prep. Wish me luck.

    © 2020 T. Jones

  5. From the album: MY FOSSIL Collection - Dpaul7

    Diplomystus dentatus Fish Fossil GREEN RIVER formation, Kemmerer, Wyoming USA Eocene age (56 Million years ago) Diplomystus is an extinct genus of freshwater clupeomorph fish distantly related to modern-day extant herrings, alewives, and sardines. The genus was first named and described by Edward Drinker Cope in 1877. There are seven species of Diplomystus: D. dentatus (Cope, 1877), D. birdii, D. dubetreiti, D. shengliensis (Chang 1983), D. kokuraensis (Uyeno 1979), D. primotinus (Uyeno 1979), and D. altiformis. D. dentatus (Cope, 1877) is well known from lower Eocene deposits from the Green River Formation in Wyoming. Specimens range from larval size to 65 cm and are commonly found in close association with the extinct herring Knightia sp. The Green River Formation is the remnant of a large lake whose mud would eventually be transformed into soft calcite-bearing shale. D. kokuraensis (Uyeno 1979), D. primotinus (Uyeno 1979), and D. altiformis were dominant members of an Early Cretaceous lake fauna (the "Diplomystus-Wakinoichthys Fauna") in what is now Japan and Korea. Dimensions: 4.6 Inches Long & 3 Inches Wide (Plate) Fish is 4.2 Inches Long & 1.5 Inch Wide. Diplomystus Dentatus morphology, including its upturned mouth, is prototypic of a surface feeding fish. The genus is herrings that likely fed on small surface-dwelling fish as Knightia is evidenced by numerous fossils found with Knightia is the stomach or mouth. The unusual chemistry of fossil lake prevented decay and scavenging of dead organisms while millimeter-thick layers of alternating limestone matter slowly accumulated. The result is laminated limestones that contained the highest concentration of fossil fish in the world. These fish, other aquatic organisms, and associated geologic features make Fossil Lake the world's best Paleogene record of the freshwater lake ecosystem. Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Clupeiformes Family: †Ellimmichthyidae Genus: †Diplomystus Species: †dentatus
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