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  1. Tetradium


    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Strophomena septata - found this spring, much better specimens than previous ones. You can see the strong septae running down the middle along with strong muscle ridges which makes it different from other brachiopods. Also smaller too and finer ridges. Hmmmm. I might will have to recheck some Rafinesquina specimens in the future.
  2. Tetradium


    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Furcitella scofieldi - I mistake took pictures of it and mislabeled it as S. septae. Much more flatter than Oepikina inquassa for its muscle scars side. Have low medium septum divide into two check. You can see in the middle of the brachiopod three dark lines - they are raised by compare to surrounding shell.
  3. Tetradium


    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Top portion of Oepikina inquassa. Heavy coating shows it have fine ridges.
  4. Tetradium


    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Oepikina inquassa - While sorting through this spring collection of brachiopods this one stood out. It came from the soft shale so was mostly intact instead of embedded into limestone which makes seeing underside difficult if not impossible. From the documentary: Oepikina inquassa is larger than Oepikina minnesotensis and is less convex. No muscle scar ridges check. Strong medium septum omits S. billingi check. Fine ridges you can see by all that iron particles/clay sticking to it check. Is more delicate than I thought plus this one have a weird quirk - two strong ridges can be seen running do
  5. April 10, 2021 1-4 pm Spring Valley, Minnesota Eagle Bluff Environmental Education Center organized hunt Led by Bev Sandlin, Bluffcountryfossils.net Whispering Winds, Spring Valley, MN Galena Formation Ordovician fossils What FUN!!! And what Great Finds! This hunt was organized by Eagle Bluff Environmental Education Center in Lanesboro, MN. I am doing hunts for them every 2nd Saturday of the month through this season and any private hunts they book as well. We had about 20 participants and it was a whirlwind hunt they all were enjoying as I left them still hunti
  6. Misha

    Ordovician fossils in PA

    Hi everyone, I recently remembered the location of swatara Gap in Pennsylvania, I remember reading about it but the problem is that the site was covered up way before I was even in the United States, there is the swatara state park nearby but that has younger Devonian rocks of the mahantango. My question is are there any similar sites with Ordovician rocks anywhere in PA? I am especially interested in the Cryptolithus trilobites and if those can be found anywhere else around here as that would be a wonderful fossil to add to the collection and have the experience of uncovering.
  7. Ordovician Galena Formation, probably Prosser member SE Minnesota I'm definitely slipping mentally, but I can't seem to figure out what this is! Help?
  8. Tidgy's Dad

    Adam's Ordovician.

    A nice Dictyonema flabelliforme dendroid graptolite from Oslo Fields in Norway. It's Tremadoc, Lower Ordovician in age and is thus maybe around 480 mya. Another angle :
  9. ClearLake

    Old Cincinnatian Paper

    Does anyone have access to a PDF or online version of this paper?: Dalvé, E., 1948. The fossil fauna of the Ordovician in the Cincinnatian region. University Museum, Department of Geology and Geography, University of Cincinnati, 56 p. Thanks
  10. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Here is the third picture of unknown bryozoan species.
  11. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    More close up of unknown Decorah formation bryozoan. You can see the much thicker wall clusters together.
  12. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Close up of the unknown species showing varying walls thicknesses
  13. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Batostoma species from Mifflin portion of Platteville Formation. Since there hadn't been any official researches into platteville bryozoan, I would assume this to be a early forerunner of Batostoma fertile as it looks very similar to it but on average smaller. One rock have a different species running parallel but camera couldn't get more details.
  14. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Unnamed species. I keep getting in over my head with all the vocabulary so most likely not new. I only found this species this year in a new Decorah dig site location. I would had almost tossed it aside if not for the first piece I found which is much longer than the usual rugose decorah twin cities Ordovician bryozoans. On closer inspects it is so different from my Batostoma species. Rarely branching which is very unusual for a rugose bryozoan, very variable wall thickness as seen as under digital microscope. Only found in this one location.
  15. Tetradium


    From the album: Ichnofossils of Platteville to Decorah Formation Twin Cities

    One of the largest most complete Rauffella palmipes feeder burrow fill I have ever found. I hadn't heard of any other trace fossils yet that comes close to this weird one. The invertebrate animal that leaves them makes overlapping spoon shaped burrows with one entry hole.
  16. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Stictoporella frondifera. Very localized abundant in lower Decorah formation Minnesota, Ordovician, Twin Cities.
  17. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Phylloporina sublaxa uncommon Decorah formation Ordovician Minnesota Twin Cities. I tend to find them in pretty small pieces and obviously easily overlooked. Much more finer laces than Stictoporellina cribrosa.
  18. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    "Batostoma minnesotense" Decorah shale Twin Cities Ordovician. I couldn't tell any difference under digital microscope or by eye examination so any similar species are lumped by me under it. Very abundant in Decorah Shale. Only difference between this and Batostoma fertile is by compare of side by side specimens. Batostoma fertile have larger zoarium that is noticeable with the naked eye.
  19. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    The best I could do with digital microscope of close up of Batostoma fertile specimen.
  20. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Compare of two Batostoma species from the same Decorah formation. They both overlaps in shape, size, and are among the largest branching bryozoan in Decorah Formation. The left three are Batostoma fertile and the right 3 are Batostoma minnesotense.
  21. Tetradium


    From the album: Bryozoan of Minnesota Ordovician

    Batostoma fragile Decorah Shale Ordovician Twin Cities Minnesota. When comparing all bryozoan fossils from Ordovician this one stands out as having the largest zoarium. (fossil terms for the pores). Its also the largest branching bryozoan I had found in terms of masses. One thing I have noticed with this is compare to "Batostoma minnesotense" It tend to be ,more lumpy and more flexible into forms, even at times mistook for Prasopora conoidea if not for its larger zoariums.
  22. Dimitar

    Ordovician brachiopod

    Please help to identify what kind of Brachiopod is this: N.1 N.2 N.3 N.3 N.5 N.6
  23. When I found this small piece - I was sure it is a brachiopod... But now after looking on many other things, I am sure it is not a brachiopod. I am thinking about the base of a coral. Please help to identify it. This should be Ordovician. N.1 N.2 N.3 N.4 N.5 N.6 N.7
  24. Dimitar

    Solved: Graptolite

    Hello guys! Initially I was thinking about roots of some plants, then I realized there are no plants during this time period. It's Ordovician. Found between Montreal and Laval, Lac du Preries. Could this be Hallucigenia ? N.2 N.4 N.6 N.7 N.8
  25. Dimitar

    Ordovician fossil

    Hello guys, please assist to identify this fossil. N. 1 N.2 N.3 N.4 N.5
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