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Found 5 results

  1. Mikrogeophagus

    Paragassizocrinus tarri, Mineral Wells Fm

    From the album: Desmoinesian Series

    Paragassizocrinus tarri., North TX Mineral Wells Fm Feb, 2023 A stemless floating crinoid.
  2. BobWill

    Bryozoan

    Triangular or "y" shaped cross-section with bifurcating branches. Zooecia radiate out from center. Stratigraphy: there is uncertainty over whether "Deese" should have Group or Formation status. Systematics: This is Prismopora triangulata (White 1878), not Prismopora triangulata Kiseleva 1973 (a Russian Permian form). These are presumably different species and homonyms and it's unclear whether either is taxonomically valid as White's description has no illustrations or type material. Prismopora triangulata (White) has been used in geological survey faunal lists but apparently without formal revision. White's description under the genus Ptilodyctia (usually Ptilodictyia) in: White, C.A. (1878) Descriptions of new species of invertebrate fossils from the Carboniferous and Upper Silurian rocks of Illinois and Indiana. Proceedings of the Academy of Natural Sciences of Philadelphia, 30, 1878, 29-37.
  3. Gramps

    ID help: Deltodus tooth?

    I know very little about shark teeth. I found this one a while back in Pennsylvanian (Desmoinesian) shale in northeastern Oklahoma. I am speculating this may be deltodus only because I see a nearly identical tooth labeled as deltodus on another website. The fossil is very thin (too thin to photograph the edges). Besides confirming the taxonomy, can anyone tell me which surface of the tooth is shown in Side A? Finally, would you say Side B is mainly matrix (other than the edges)? I think matrix is showing through the cracks on Side A, and that may be the only thing holding the fossil together. My wife recently got me a camera, so I am working on a gallery album in the forum. I would like to make sure I have the IDs correct before I post photos in the album, so you may be seeing several ID requests from me over the next weeks. Best wishes
  4. Gramps

    Deltodus Tooth.JPG

    From the album: Pennsylvanian Fossils of Northeast Oklahoma

    This is one of the crushing teeth of Deltodus, from Pennsylvanian (Desmoinesian) shale in northeastern Oklahoma. This tooth is only about 4 mm thick. Deltodus comprised a genus of cartilaginous fishes in the class Chondrichthyes, subclass Holocephali. Modern day holocephalans include chimaeras.
  5. I was fortunate to be able to take two trips recently to the Marmaton group in Northern Missouri and wanted to share my trip report with the forum. It's hard to find information on the Marmaton in Missouri, and I struggled with the geology and understanding what members within the Marmaton I was seeing, but I had a great time non the less. I grew up in this region and have some ‘insiders’ information on a few spots I wanted to check out just from spending time running around the countryside as a kid. The first was in a local creek in the township I grew up in that contains concretions we called ‘dragon eggs.’ I was curious if they would contain fossils so on my first trip in early September I committed to breaking one open. First, here are a few pictures of the site: I was able to break this one open, and it did contain fossils! The blue line on the lower left marks a very thin layer of limestone that the concretions seem to form right above. Here are a few more pictures of the concretions for reference. A particularly large one: And one that is just cracked: Unfortunately for me only the very first one I broke had any fossils. I spent several hours hoping another would reveal some but luck was against me at that point I guess and I failed to find a single one. Frustrated I spent the remainder of the evening searching through the fallen limestone exposures. The next post will contain some of the specimens from the single fossiliferous concretion and the limestone.
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