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Found 4 results

  1. Fullux
    Not exactly sure whether this is new information, has already been observed, or if this is just me misinterpreting fossils, but I recently noticed that there are two species of the Coon Creek Formation that look very similar. That being Pterotrigonia thoracica and Trigonia eufaulensis. I noticed while observing a gallery made by @Herb that each species looks very similar, and are almost indistinguishable. Upon observing other examples of each species, I came up with this conclusion: P. thoracica typically has 14-15 ribs on its shell, while T. eufualensis has 16-17. Let me know what you all thi
  2. JamieLynn

    Bivalve Pterotrigonia guadalupae.JPG

    JamieLynn posted a gallery image in Members Gallery

    Bivalve Pterotrigonia guadalupae.JPG

    From the album: Texas Cretaceous Fossils : Bivalves - Clams

  3. Ludwigia

    Pterotrigonia sp. (Van Hoepen 1929)

    Ludwigia posted a gallery image in Members Gallery

    Pterotrigonia sp. (Van Hoepen 1929)

    From the album: German Gastropods and Bivalves

    5.5cm. long. From the Late Cretaceous Heimburg Formation in Blankenburg, Sachsen-Anhalt.
  4. Ludwigia
    Both valves intact.
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