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  1. mateosfossils


    This is from the Platteville formation. Is it a barnacle? I'll buy a ruler tomorrow lol. Thanks for all the help today!!
  2. 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.
  3. Tetradium


    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    Amphilichas sp. cephalon. This is pretty small - .7 cm across. Platteville Formation Twin Cities Minnesota. Rare. Its cephalon is very distinct, having 5 well definite lobes.
  4. Tetradium


    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    Sceptaspis lincolnensis cephalon with damage to one eye and part of head. 1.7 cm across. Platteville Formation Twin Cities. Rare at least to me.
  5. Tetradium


    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    Unidentified Ceraurid free cheek plus different unidentified cephalon piece. Rare - this is the only one I had found so far - turn out the "lumpy" part is one of its eyes. Platteville Formation.
  6. Tetradium


    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    Calyptaulax plattevillensis (thank Kane for positive Id) uncleansed piece. Cephalon and thorax is visible in picture. Lower Platteville Formation
  7. Tetradium


    From the album: Corals of Decorah Minnesota

    Platteville formation Lambeophyllum profundum. Outer laver are gone. Uncommon to rare.
  8. Tetradium


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

    Pionodema conradi. I knew I had some tiny orthid brachiopod from Middle Platteville Formation but after checking book and this website: https://2dgf.dk/xpdf/bull26-01-02-115-132.pdf Kind of weird. I think Hesperorthis concava was invalid - too similar and two very close look alike can't compete with each other. One other brachiopod mention on the list Campylorthis deflecta look too much like Strophomena species despite a website saying genus name is valid.
  9. Tetradium


    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    Turn out that is where the missing thorax is! So tightly coiled than I thought.
  10. Tetradium


    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    This one specimen is a typical head - it is much more pointed. Then I accidently chopped a piece off and got a surprise.
  11. Tetradium


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

    ?Cincinnetina minnesotensis. Middle Platteville Formation, rare. I hadn't found any Hesperorthis in middle Platteville yet and there's lack of information on Platteville orthid brachiopods as I have one to two other species from middle platteville but they're tiny and difficult for me to photograph at current. The big brachiopod in NE rock is Oepikina inquassa - they have very fine costae and may appear to be darker because of it.
  12. Tetradium


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

    Hesperorthis tricenaria. This is upper Platteville formation which is very abundant and the most easily identified brachiopod from that layer - diversity of fossils in upper platteville while abundant, tend to be very low in diversity. Among brachiopods of upper platteville, mainly Strophomena filitexta, Hesperorthis tricenaria, Oepikina minnesotensis, Rafinesquina sp, and maybe Oepikina inquassa is practically the only brachiopod species found in upper Platteville.
  13. Tetradium


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

    Oepikina minnesotensis. Occurs mainly in upper Platteville formation. I'm not 100% sure if they occurs in decorah formation as I had found unusual circular inflated shells but its much harder to see their hinge line or muscle scars at present. Either the decorah version is a extreme version of Doleriodes pervetus or Oepikina minnesotensis. They usually differs from Strophomena filitexta into being more compact and rounder, also more inflated. They're much smaller compare to Oepikina inquassa and less variable in shapes. You can see the fossil in the farthest left of the picture have unusual we
  14. Tetradium


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

    Not especially preserved top layer of Oepikina inquassa. Oepikina inquassa is very highly variable in shapes and mainly only found in Decorah formation, thought I suspects also exists in Platteville. Tend to be larger than Oepikina minnesotensis.
  15. Tetradium


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

    Rostricellula minnesotensis. Seem to be Platteville formation only for me. Easily mistaken for Rhynchotrema wisconsinense until I noticed something odd with my specimens. The sulcus barely exists and sources usually says Rostricellula generally are smaller than Rhynchotrema. Plus the picture I had seen of Zygospira recurvirostris look significant different.
  16. Tetradium


    From the album: Bivalves of Platteville/Decorah Formation Minnesota

    Vanuxemia sardesoni Platteville only that I know of. Much more flatter and wider than other Vanuxemia species. Uncommon.
  17. citrine.colubrid

    Fragment of something

    I spotted this thing in a hash plate and I'm wondering what it could be. I'm assuming it's a fragment of something like everything else it is jumbled with, but I don't really recognize it as anything. Found in SW Wisconsin in the platteville formation.
  18. citrine.colubrid

    Fossil Algae?

    I've got this big hash plate that I collected last year and I somehow didn't notice this thing poking out until now. It looks like an algae to me. Found in SW Wisconsin in the platteville formation.
  19. citrine.colubrid

    What is this?

    Just came back from a short trip to the driftless region of SW Wisconsin and we found a strange fossil in a road cut. I thought it was an algae at first, but I can't find any similar images. Sort of just looks like the rims of a rugose coral, but tiny? Found in Platteville formation.
  20. ToeKnee


    I found these in the McGregor member of the Platteville formation in SW Wisconsin. Endoceras?
  21. I came across this unusual fossil on a recent collecting trip to Southwestern Wisconsin. It was attached to a hash plate containing mainly brachiopod fragments. It appears to be some type of sponge that I have never encountered before. It is roughly the size of a tennis ball with an opening at the top. There is also a smaller round opening on one side that might have been from predation. Any thoughts on what this might be?
  22. minnbuckeye

    Dolichoharpes reticulata

    Last summer I had the opportunity to explore SW Wisconsin for a short afternoon. I posted my finds back then including this picture: This trilobite was IDed as an upside down Dolichoharpes reticulata by our Fossil Forum trilobite expert. He suggested that I have it professionally prepped due to its rarity. Being a conservative man to begin with, and having never had any of my finds professionally prepped, I was a bit concerned about the fees for this. But I found the right man for the job and he even gave me a great break on the prepping. The results to me were absolutely
  23. Sorry this report is late, but I wanted to wait until prep was complete as I always show unprepped finds lol. Back in May, Laura and I made an impromptu trip to Grant County Wisconsin for some trilobite action. We had spent nearly five hours hunting with only partials and some hash plates uncovered. I decided to sit in the middle of the site and take a break and let Laura search. Being bored, I started to pick up pieces of rock and brush off the dirt and broken pieces of matrix. To my utter shock, I brushed off some dirt and saw a cephalon emerge, with what looked like thoracic segments. I fin
  24. The Great Minnesota Brachiopod Caper of 1892 Equatorial Minnesota, Wednesday, August 31, 2016 http://equatorialminnesota.blogspot.com/2016/08/great-minnesota-brachiopod-caper.html http://equatorialminnesota.blogspot.com/2016_08_01_archive.html A couple of papers: Weiss, M. P. 1997. Falsifying priority of species names: a fraud of 1892. Earth Sciences History 16:21–32. http://earthscienceshistory.org/doi/abs/10.17704/eshi.16.1.8174541832360711 Tweet, J., 2014, Smashed rodents, false preprints, and the BBC:
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