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  1. Irongiant97

    Fossil wood or worms or ???

    Found today at new spot in northern Minnesota, part of the cholera one formation. Not sure what it is exactly, possibly fossilized wood with worms or something.
  2. First trip of the year to Decorah Shale Formation in Ordovician Minnesota. This was one of the few fossils I found - I assumed it was a regular Large Gumdrop Bryozoan, Prasopora conoidea. Then when I got to cleaning the clay and soft shale off it looks so different. No noticeable pores and sharp angles. Here's two Large Prasopora conoidea - one smooth form and one rough and layered form on the left side for comparation. There is also a little Hormotoma fragilis gastropod on top. It doesn't even look like a trace fossil, as trace fossils are usually harder than usual shale or gathering of coar
  3. So I went to a new site nearby me where I heard there were shark teeth and while I didn't find any shark teeth I found flint(?) fossils, that, unlike my previous flint(?) fossils, which I believe were deposited by glaciers, I think these ones are native to where I found them, which is an old mine overburden pile (the rock above the ore they're mining for), my evidence for this was the presence of many iron rich rocks that was in the same pile, pictured I have what I believe is botryoidal hematite, which hematite is what they mine here. Also the fossils in these new specimens are different to
  4. I think I already know the answer here but what are your thoughts on this humerus. Found in a creek bank in southern Minnesota. Sediments in the area range from cretaceous to holocoen with a good amount of Wisconsin lobe glacial till. Previously we have found bison, mammoth, and ancient horse...
  5. Does anyone have experience with the Middle Ordovician brachiopod faunas of the upper Mississippi Valley? I came across this odd fragment in rocks from a quarry in south-central Wisconsin. To my knowledge they are known in North America only from the Appalachian Basin (Tennessee, Virginia, West Virginia, Pennsylvania, Quebec, Newfoundland), not the interior basins like the Illinois basin. Has anybody else seen this critter or similar in the Platteville? As far as I am aware, the only species documented from the Platteville that looks anything like this is Megamyonia unicostata, but that h
  6. Tetradium

    Glyptocrinus sp. ?

    Ordovician, Decorah Formation Minnesota Just want your opinions on it before I post it to my image gallery. I'm not a crinoid expert and this is rare - only my second crinoid from the Decorah Formation with more than 60% completeness. The first is a tiny one not even 2 inches from crown to base. This is more of a medium size with 110 mm from head to base. Using paint I pinpointed different areas for helpful info. #1 Is the arms - can't really see in picture but very clear to me some scavenger buried the arms - I could see a few faint tunnels a short distance away.
  7. Tetradium

    Vinlandostrophia amoena

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

    Largest of the two Vinlandostrophia species in Minnesota Decorah formation. Resembles Dinorthis pectinella strongly. Seem to be fragile as I couldn't find any whole specimens of this uncommon brachiopod.
  8. Tetradium

    Petrocrania halli

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

    Outer view. Often encrusted by other animals.
  9. Tetradium

    Petrocrania halli

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

    Interior view - no hinges - irregular cup shaped.
  10. Tetradium

    ?Petrocrania halli

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

    Acanthocrania setigera is described as only difference in having spinosa/pillose ornamentals on the outside which is a vague definition to me and is possible invalid name. So I'm just using Petrocrania halli for now. Occurs in mifflin section of Platteville Formation and Decorah Formation. Most common inarticulated brachiopod in Decorah formation.
  11. Tetradium

    Schizocrania sp.

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

    Rare Inarticulated brachiopod. Author claimed to only found one. Decorah Formation. Rounded with slightly raised edges. Unidentified bryozoan sp. can be seen on a single film covering part of the shell. Have parallel lines going from one end to another.
  12. minnbuckeye

    Polishing Mary Ellen Jasper

    While vacationing in northern Minnesota, I picked up this piece of Mary Ellen Jasper. My goal was to have one side polished in order to bring out the features of the stromatolite. Unfortunately, my attempts to find someone locally to polish it failed. Does anyone have knowledge of someone who could tackle this for me?
  13. dbrake40

    Mystery Bone - Pleistocene?

    Mystery bone fragment. Partially mineralized. Found on a riverbank in southern Minnesota. Deposits on the river are mostly Pleistocene to modern ( with a couple Cretaceous band cut through). My first thought was a very old very tumbled calcaneus (horse or bison size). But the depression, pointed out in red circle, does not seem to match either of those. I know its very worn but thought I'd give it a shot here.
  14. Tetradium

    Oepikina inquassa

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

    Highly variable brachiopod species which had two invalid species merged into a third species. O. inquassa is the largest of the two Oepikina species. Mainly Decorah Formation but maybe in Platteville Formation but I hadn't found hard evidences yet. #1 shows (its harder to photograph) distinct septae that is pronounced in some individuals and absent in others. It always start with a curved septae and one central septae that goes out a bit of distance. Then in some individuals there are clearly short septae random radiates outward from the center. #2 shows the clear distant growth lines that Oep
  15. Tetradium

    Strophomena billingsi

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

    The major difference between S. billingsi and S. filitexta is the lack of enclosed muscle scars and S. billingsi tend to be smaller. #2 shows the difficulty for me - it shows a muscle scar - is it a broken enclosed one or is this normal for S. billingi? I don't know for sure. #3 S. billingi wasn't reported by authors as occurring into Platteville formation but I found shell hashes full of it into Mifflin Formation. I still have to look through a lot of individual platteville fossils in the future to see if other Strophomena species are represented - I have seen hints of possible S. septae. S
  16. Tetradium

    Strophomena filitexta

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

    Most abundant of the three Strophomena species in Decorah Formation and the largest. #1 shows the most significant feature that differs S. filitexta from S. billingi - the complete enclosed muscle ridges. #2 shows the significant different (at least in individuals that have both halves of shells) between Strophomena from Oepikina/Rafinesquina. Only Strophomena have the triangular structure enclosing where its weak hinge teeth are. #3 Shows the diversity into shapes - this is one of the few highly inflated forms I have found of S. filitexta. I have a lot of difficulty telling the smaller indivi
  17. Tetradium

    Strophomena septae

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

    Locally common? Most of those individuals were found in one layer this year. One of three official species of Strophomena from Decorah/Platteville Formation at least in Minnesota. #1 It resembles Strophomena filitexta into having an enclosed muscle scar. But it differs greatly from Strophomena filitexta into several ways - one of the most noticeable ways is into having a prominent central septae that run down the center. The other two Strophomena species lacks that prominent central septae that runs all the way down the shell. #2 is a false sulcus that runs down the outside of the shell. In va
  18. Tetradium

    Oepikina minnesotensis

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

    Found in both Decorah and Platteville Formation. One of two official Oepikina species found in Decorah and Platteville Formation. #1 shows a distinct feature of Oepikina that most sources doesn't seem to mention that makes it distinct from rest of family branch at least for Decorah/platteville formation - A distinct growth line that always occurs 80% to 90% of the distance from hinge teeth. #2 shows that compare to most if not all brachiopods from Decorah to Platteville Formation, Oepikina is the most extreme in inflated shells, often resembles a cannon ball cut into two dues to its fine cos
  19. Tetradium

    ?Cyrtodontula compressa

    From the album: Bivalves of Platteville/Decorah Formation Minnesota

    Darken image and no paints to enhance the natural appearances.
  20. Tetradium

    ?Cyrtodontula compressa

    From the album: Bivalves of Platteville/Decorah Formation Minnesota

    Whitella is an invalid genus name - all specimens once called Whitella is in Cyrtodontula. Found in Decorah shale - the largest uncommon bivalve I have ever found in Decorah Shale as of 2021. There could be others since all bivalves are listed as uncommon to rare in Decorah shale. It could be my bias but oddly enough I only find mold impressions of this one (all 3 individuals) as negative molds in limestone without any hard shale encrust in the hollows. Trying Paint to show outlines - strongly resembles modern Anadara notabilis in general shape for example - its NOT related to Anadara. I'm on
  21. 99 Rockhounding

    Is This Petrified Wood?

    I found this mystery rock on a lake shore in central Minnesota. Is it petrified wood? How does one tell whether or not a rock is petrified wood? Thanks for the help!
  22. J.Parshley

    I need help with a tooth

    Today I was walking up a small stream in western Minnesota and I grabbed a large rock to toss and under it was this thing that kinda looked like a tooth. I emailed it to my paleontologist friend and while he couldn’t identify it (he specializes is Texas fauna and actually identified a Patelodus tooth for me last month) he found it interesting. I found this forum and knew it was the next best place to try. I have no expectations and I appreciate any and all thoughts. I’ve followed the topic and I’m happy to answer any questions. Thanks -Jeff IMG_
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