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  1. Can you help determine if these are real as described and any steps I might take to further confirm the details? [seller verbiage removed -- Staff]
  2. I'll start with images I've already posted on the forum. All are from the Kansas City metropolitan area. Winterset Limestone.... Metacoceras: Liroceras: Stenodomatoceras: Undetermined: Domatoceras umbilicatum: Wea Shale.... Metacoceras: Westerville Limestone.... Domatoceras: Chanute Shale.... Mooreoceras or Pseudorthoceras: Liberty Memorial Shale.... Metacoceras: I'll add many more images in the future.
  3. minnbuckeye

    Unknown Ordovician Cephalopod

    My last trip exploring the Maquoketa of Minnesota, a formation that is abundant in cephalopods, provided me with a serpenticone shaped specimen that I do not recognize. Help IDing this would be appreciated. The siphuncle is not visible in this specimen. I did some infill with putty to enhance its look (in my opinion). The small repair is delineated by the red marks.
  4. Tetradium

    Triptoceras lambi

    From the album: Minnesota Ordovician Decorah Cephalopods

    Above view of fragile specimen of Triptoceras lambi
  5. Tetradium

    Triptoceras lambi

    From the album: Minnesota Ordovician Decorah Cephalopods

    different specimen, very fragile. Side view showing the siphuncle. Uncommon in Decorah Formation Twin Cities Minnesota.
  6. Tetradium

    Triptoceras lambi

    From the album: Minnesota Ordovician Decorah Cephalopods

    One of the largest Triptoceras species I have found in Decorah Formation Twin Cities Minnesota. This is a very worn specimen with septae lines barely visible.
  7. Tetradium

    Triptoceras lambi

    From the album: Minnesota Ordovician Decorah Cephalopods

    Side view of the largest Triptoceras species in Decorah Formation Twin Cities Minnesota showing the trademark shape of genus Triptoceras.
  8. Tetradium

    Triptoceras oweni

    From the album: Minnesota Ordovician Decorah Cephalopods

    Triptoceras oweni - heavily bryozoan encrusted specimen. Medium sized for a Decorah Formation Cephalopod. Twin Cities Minnesota Ordovician.
  9. Tetradium

    Triptoceras planodorsatum

    From the album: Minnesota Ordovician Decorah Cephalopods

    Typical view from above. Two specimens - one looked too odd to be a bryozoan.
  10. Tetradium

    Triptoceras planodorsatum

    From the album: Minnesota Ordovician Decorah Cephalopods

    Triptoceras planodorsatum Decorah Formation, Twin Cities, Minnesota. Very small, this is a side view showing the bend.
  11. Tetradium

    Triptoceras planoconvexum

    From the album: Minnesota Ordovician Decorah Cephalopods

    Another view from different side.
  12. Tetradium

    Triptoceras planoconvexum

    From the album: Minnesota Ordovician Decorah Cephalopods

    Triptoceras planoconvexum appear to be medium sized compared to the other Triptoceras species from Decorah Formation in Twin Cities. Rare.
  13. Tetradium

    Triptoceras lambi

    From the album: Minnesota Ordovician Decorah Cephalopods

    Very worn specimen with barely any details left.
  14. Tetradium

    Whitfieldoceras mumiaforme

    From the album: Minnesota Ordovician Decorah Cephalopods

    The cut half which is a very thin shell filled with calcite minerals in a geode meaning it was complete hollow at the time of fossilization process.
  15. Tetradium

    Whitfieldoceras mumiaforme

    From the album: Minnesota Ordovician Decorah Cephalopods

    Apparently Whitfieldoceras mumiaforme lasts into Decorah Formation from Platteville formation. This specimen has barely visible septae and is very thin. Seem to have enlargement on the left side which is constant with Whitfieldoceras and a bend along a certain portion of the shell. Ordovician, Decorah Formation, Twin Cities Minnesota. Rare.
  16. Tetradium

    Cyrtoceras sp.

    From the album: Minnesota Ordovician Decorah Cephalopods

    Side view showing its general "pot belly" shape. It is hard for me to try to get any more details out of it other than this specimen being straighter than most cyrtoceras.
  17. Tetradium

    Cyrtoceras sp.

    From the album: Minnesota Ordovician Decorah Cephalopods

    Top view - Rare in Decorah Formation Twin Cities. Small size, the muddy limestone made it hard to tell what species it is.
  18. Tetradium

    Endoceras proteiforme

    From the album: Minnesota Ordovician Decorah Cephalopods

    A large Endoceras proteiforme. From Decorah shale. Only a little section of the shell remains on the lower half. The segmented part are septum and the smooth part are siphuncle.
  19. Tetradium

    Poterioceras apertum

    From the album: Minnesota Ordovician Decorah Cephalopods

    Poterioceras apertum found in St. Paul Decorah Shale Spring 2023. Rare from the looks of it.
  20. Rock-Guy-17

    Spyroceras crotalum

    From the album: Devonian - New York

    Spyroceras crotalum Moscow Formation Middle Devonian Cole Hill, Madison Co., NY Self Collected - 2023
  21. Collector9658

    Metacoceras? Nautiloid cephalopod fossil

    From the album: Pennsylvanian fossils

    Phylum: Mollusca Class: Cephalopoda Order: Nautilida Family: Tainoceratidae Genus: Metacoceras?
  22. Hello again, here are another two fossils (or not) that I'm unable to place. They come from llandovery formation locality Hýskov from a shallow sea rich with trilobites, graptolites, brachiopods, bryozoans and crinoids. All other llandovery formation localities in Czech republic are deep sea shales with only graptolite fauna and very few brachiopod species. 1) Hýskov is very rich with beautiful graptolite fauna, like this dendroid Dictyonema graptolites. This fossil (if it is fossil) is preserved in a very much same way as the graptolites, while other fauna there is more plastic. 2) This one is probably a cephalopod of some sort, probably related to Cyrtoceras? However I can't see any segmentation. The white structures are probably only some sort of secondary minerals? Thanks in advance for your opinions Ondrej
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