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  1. Is anyone familiar with the Paleozoic formations on Bear Mountain, just northwest of Silver City, New Mexico? I have collected there a couple of times but am unsure as to which formation I was sampling. My first guess is that it is the Andrecito Member of the Lake Valley Limestone (Mississippian (Early Osage) but I know that there are also fossils found in the underlying Devonian Percha Shale, especially east of Silver City. There are a variety of brachiopods, bryozoans, rugose corals, and some crinoid bits. The photos show one of the larger brachiopods. Do you recognize it? Thanks.
  2. minnbuckeye

    FLAT Brachiopod

    My recent trip to the Maquoketa Formation of Iowa produced a brachiopod that baffles me. It appears to have both shells but it is extremely flat. Help needed with ID!!! Mike
  3. With the nicer weather last week, I was able to make two brief trips to kick of the year. There still ended up being a lot of snow on the ground, but it was manageable. My first trip was to one of my favorite sites, a roadcut in the Pennsylvanian LaSalle Limestone in Illinois. Lots of the usual stuff was found, but the two trip makers were a small Peripristis shark tooth and a Linoproductus mass mortality plate. Here's the tooth. I think it will clean up nicely. And here are the Linoproductus. There's around 50 individuals present, and they are all quite small com
  4. Erin Presley


    We are avid winter skiers here in NYS. As soon as the temps are above freezing, the snow is gone, we are on the hunt for those Devonian fossils. A nice day trip to Canandaigua Lake, we ventured up a gully that is open to the public. On the south wall we began finding shale and limestone slides. Immediately after fanning away the leaves of fall past, the fossils presented. Many brachiopods, crinoid pieces and a few trilo butts. Our find of the day was this great little complete curled trilo and iron enriched brachiopod. We definitely will be returning. loop
  5. Kane


    Some interesting finds in the field today, but this one made me wonder if this was a brachidium or some other related feature. It looks like a trilobite, so naturally I picked it up. The piece was long exposed to the elements. Length: ~3cm Age: Mid-Devonian (Dundee Fm, Ontario, Canada).
  6. Hi, just wanted to show you prep of a quite nice preserved Lacunosella cracoviensis - endemic specie of my Jurassic area prepped with a Engraver and a little bit of vinegar for surface cleaning. Started as a 20 pounds chunk
  7. Mainefossils

    Chonetes bastini

    Chonetes bastini was first described from the Leighton Fm, also called the Pembroke Fm. It is differentiated from other species by the number of spines and its finer more numerous striae. Most specimens are missing the hinge spines. The above pictures show the pedicle valve. A poorly preserved original or cast of the shell exterior is in the left side photo. Some of the exterior of the shell may be missing since there is a horizontal groove above the shell where shell may have once filled it. The right photo shows an exterior impression or mold. Williams, Henry Sha
  8. Tetradium


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

    not identified yet. Two very similar genus.
  9. Tetradium


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

    Unidentified orthid for now. Strongly resembles Dalmanella sculpta but have sharp edges.
  10. 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.
  11. Tetradium


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

    Zygospira sp. Apparently there are a mystery with this genus when it comes to Twin Cities. I first noticed it only from Middle Platteville Formation - 100% nonexistent from upper Platteville Formation. Much more finer costae compare to Rostricellula minnesotensis and generally smaller. Belongs in Spiriferid family despite it strong resemble to Rhyconellid family. Then after a very long absent either the same species or a very similar species popped up again in upper Decorah formation and became very abundant. I suspects the reason for this seemly weird pattern is they may be much more speciali
  12. Tetradium


    From the album: Platteville to Decorah formation Ordovician Twin Cities

    Another interesting thing about Upper Decorah Formation is numerous of unidentified Zygospira species along with orthids of different sizes. For some unknown reasons Zygospira species are largely missing from lower to middle Decorah Formation even though they're abundant in Middle Platteville as well too in Twin Cities.
  13. Tetradium


    From the album: Platteville to Decorah formation Ordovician Twin Cities

    I think the two large brachiopod, one in NW corner and one SE corner is maybe new to me. The muscle ridges are very different with two parallel to each other extending from hinge line. Also seem like Upper Decorah Formation tend to have more varieties of Strophomenid brachiopods that is rarer in Middle and Lower Decorah Formation. One new thing I just learned today is Sowerbyella minnesotensis tend to be very variable in # from site to site. It is very characterized of Upper Decorah Formation as well too, being entirely absent from Middle and Lower Decorah Formation. One site had Sowerbyella
  14. Tetradium


    From the album: Platteville to Decorah formation Ordovician Twin Cities

    Some orthid brachiopods, mainly Cincinnetina and Dinorthis along with several lookalikes tend to be found only in Upper Decorah Formation. Upper Decorah tend to overlaps with Galena Formation and Richmondian formation. That's why you can find some of the same orthid brachiopod species from Minnesota to Ohio to Kentucky.
  15. Tetradium


    From the album: Platteville to Decorah formation Ordovician Twin Cities

    First Vinlandostrophia brachiopod find of the year! I will have to compare it to the other two species later. Hash is much more fragmentary - I call it bryozoan hash.
  16. Tetradium


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

    ?Oepikina minnesotensis. I'm not 100% sure yet. Oepikina tend to have very fine costae and those specimens are literally loaded with costae making them darker. There's two in the leftmost rock specimens along with a Strophomena. The annoying thing is its hard to see hinge line for a positive id. Among the most inflated brachiopod I have seen from Decorah formation, only inarticulate brachiopods are this inflated.
  17. Tetradium


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

    Sowerbyella minnesotensis. Upper Decorah formation, all of Galena Formation. Tend to be characterizing into identification of Upper Decorah formation (only exposed in Lilydale Regional Park and southern Minnesota). Other locations in Twin Cities tend to be lower (maybe middle) Decorah formation. Very abundant, can make up a big section of some shell hash. The one specimen in the middle is the largest and complete that I had found so far.
  18. 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.
  19. Tetradium


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

    Unlabeled inarticulate brachiopods. Common in Decorah formation and middle Platteville Formation. I had an interesting discussion with another person recently - turn out only inarticulate brachiopods tend to keep their shells - the other extreme lookalike which is non coiled limpet like Monoplacophora tend to be preserved as molds like true gastropods.
  20. Tetradium


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

    Unidentified orthids on the left. Dinorthis pectinella on the right. Very similar but seemly different? Smoother edges is one of the big differences.
  21. Tetradium


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

    Vinlandostrophia (formerly Platystrophia) trentonensis. Practically the only Minnesota Decorah formation orthid that I know of that have wings (Strophomena filitexta from a different family have wings but not as pronounced). Rare - hadn't found any 100% intact adult specimen yet as one wing always seem to be broken off.
  22. Tetradium


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

    Hesperorthis tricenaria - from Decorah formation. Seem like it have more diversity of shapes in Decorah than platteville, mostly in height.
  23. 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.
  24. Tetradium


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

    Dinorthis pectinella Tend to occurs in the same layers as Cincinnetina meedsi. Strongly costae, no inferior costae compare to Cincinnetina meedsi. Also tend to separate in halves when the brachiopod dies.
  25. 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
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