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  1. I was cleaning up my Platteville finds from last fall and came across this. It in all likelihood is an ichnofossil but if anyone have additional thoughts about it, please reply!! The Platteville has plenty of trace fossils but I have yet to see one with this appearance. Would love to have an idea of it's maker.
  2. 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
  3. Last month I was able to make a brief trip to hunt the Ordovician rocks of the Upper Mississippi Valley. The stratigraphy up here was very confusing to me at first since a lot of the units are very similar looking. To that end, I am endeavoring to include more site pictures in my trip reports of this area, in the hope that it will assist others when collecting this area. My first stop was in SE Wisconsin. Unfortunately the right of way was much narrower in person than on Google Earth so I did not feel comfortable collecting here. But it was a great site to observe the three lowest
  4. I've been super excited for this book to be released since I heard about it last year. The diversity in the Platteville is astounding, but there are not a huge number of publications on its fauna, and most without pretty pictures. I just ordered my copy. Dennis Kolata is the Platteville expert, so I have no doubt this will be a phenomenal book. https://isgs.illinois.edu/achievements/august/fossils-upper-ordovician-platteville-formation-upper-midwest-usa-overview
  5. This specimen is from the Ordovician Platteville Formation of Wisconsin. The top part looks like a crinoid stem, but the larger disc at the bottom is throwing me off. My only thought was possibly a holdfast. Any thoughts?
  6. Hello! After losing 2020, and then winter, I was finally able to get out and look around in my new area, NE Iowa and near Grant County, Wisconsin. I walked down a few rivers in the Ordovician areas, Platteville Formation, Grant County, and picked up what I think might be a Trilobite? Based on the Various publications of the region, it may be Sceptaspis lincolnensi, but this is really my first Trilobite I have found (in many years of walking along looking at rocks) I haven't cleaned off any of the matrix, just a nice scrub. I also found this hash plate nearby, I liked the Gastropod? In the cent
  7. Tetradium


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

    Ceraurid hypostome. Platteville Formation (SW corner specimen) and rest are Decorah Formation. For a long time I thought it was little rolled up trilobites, that's how much the hypostome look like. Tiny .5 cm for Decorah ones and .6 cm for platteville ones. Decorah ones seem to be uncommon to common and very easily overlooked because of its tiny size. Heck I wonder how many had I overlooked over 5 years.
  8. We've been finding these oddball puffy stars in the Late Ordovician (Sandbian) of eastern Missouri (Illinois Basin), in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group (Katian). We've been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but these I'm at a loss on. They seem to be calcite and preserve in the same texture and color as other echinoderm material in the same rock. They vary in convexity and in the presence of a central hump or divot, but there never seems to be a lumen that goes
  9. connorp

    Possible Ordovician Graptolite?

    I found this small specimen in the Platteville Formation (Middle Ordovician) in Wisconsin. My first reaction was that it might be a graptolite fragment, especially as it looks to be preserved as a carbonaceous impression. However, I would appreciate a second opinion. Thanks!
  10. I'm slowly making my way through finds from the summer and have come across a couple specimens I don't recognize. The first one is from the Platteville Formation of SW Wisconsin (Middle Ordovician). The second one is from the Maquoketa Formation of NE Iowa (Upper Ordovician).
  11. Crusty_Crab


    This was found in the Ordovician Platteville Formation near Platteville, Wisconsin. Only a tip was exposed and i thought it might be a trilobite but prepping it further, it looks like just a fragment. My best guess is that its part of the cephalon but its curved and I can't really tell which part it might be from. Any opinions?
  12. @GeschWhat had the opportunity to join us in this hunt, but requested a picture of my find instead. To appease her request today, I hastily put this report together: @RandyB and his lovely wife are currently on a 2-3 week fossil tour of the western US and I volunteered to provide them with a little fossil hunting during a rest period on their way west. We had a wonderful time, maybe chatting as much as fossil hunting during their short break from driving. We were in the middle of dairy country and the smells of fresh cut alfalfa mixed in with a little "coprolite" permeated
  13. gieserguy

    Unknown Ordovician fossil?

    I found this back in July from the Ordovician Platteville Formation in Oregon, IL. This is the only picture I have of it, and unfortunately, since it’s at home and I’m at school, this is the only picture of it that I have. It’s less than 2cm from side to side. I just don’t know with this one, my best guess is part of trilobite maybe? Any help would be appreciated. Thanks!
  14. Reklaw

    Odd horseshoe shaped fossil

    Hello all, This strange fossil is from the Platteville of Beloit Wisconsin and I have no idea what it is. It is fairly well preserved with a fine granular texture to it. Any ideas are welcome! (3 inch post it note for scale)
  15. Reklaw

    Platteville Cephalopod

    So this is a fossil from Beloit Wisconsin found in the Platteville formation. I am pretty sure it is a cephalopod but I have no idea what genus or species. The siphuncle is hollow except for two septa that run right through it. 3" post-it note for scale.
  16. Reklaw

    Ordovician trace fossil?

    This is another piece from the Platteville formation in Beloit Wisconsin. Inside a gastropod shell there is a hexagonal pattern that sort of looks likes Paleodictyon, but I think this fossil formed in too shallow of water for Paleodictyon to occur, but I am not sure. Its on a 3" post-it note for scale. (There is also a nice Pterotheca to the left!)
  17. minnbuckeye

    Plattville Ordovician Unknown

    I had a fun weekend hunting for fossils. The first day was spent in East Central Iowa with the fossil club that I belong to. A special find occurred there (placoderm tooth) and identified on the forum yesterday. I then headed east and looked at the Ordovician Platteville of SW Wisconsin. While at home looking at the specimens I returned with, I stumbled across this. Has me baffled. A stem taking a right angle turn leading to a sunburst type of pattern up top. Probably a few different bryozoans that come together suggesting what I see. But I would like some more intelligent people than me to e
  18. minnbuckeye


    I just went through my bag of trilobits from this summer. Most are identified. I am getting better with time!! Here are a few Small pygidiums, all between 1 and 2 cm. These small non descript tails are hard for me to identify. If there are ones that stand out, let me know, and why you think so! That way I will know for next summer's specimens. They are numbered. Thanks, Mike
  19. 2018 was the year that I finally took some time to explore Ordovician aged sites in Southwestern Wisconsin and Eastern Iowa. Inspired by past forum posts (special shoutout to Caleb Scheer who was unfortunately taken from this world way to young) along with an invite from a fellow Fossil Forum member, I was able to make several trips into the fossil rich Platteville and Maquoketa formations. I was mainly focused on finding some of the amazing trilobites that these formations are known for. I also collected some nice representative examples of the various other fauna. Most of my e
  20. RCFossils

    Platteville Wisconsin Crinoid Help

    I think that I found a small crinoid in the Ordovician aged Platteville Formation of Southwestern Wisconsin. i know there is not much to go on but am hoping someone can confirm that it is a crinoid. Any idea on species would also be appreciated. The specimen measures around an inch.
  21. Locally, I find quite a few large cephalopods. Here is an example: Unfortunately this specimen was deteriorated. and I collected only it's exposed siphuncle. After gluing it back together, I noticed definite narrowings that I do not understand. Other siphuncles I have found have raised areas on them, not narrowings. Any ideas on this anatomical aspect??? Here is another cephalopod I found that day. Love the crystals inside.
  22. Walker_Weyland

    Unknown Ordovician Fossil

    This fossil is from the Platteville formation in southern Wisconsin, which is Ordovician in age. It does not seem to be a compress spiral, but rather composed of separate pieces or plates that alternate on either side. At the tip there are two sections that are positioned in the middle rather than on either side like the rest of the sections seem to be. I put it under the microscope but there is not much finer detail besides the individual grains, so it does not seem to be a Bryozoan or Coral. If anyone has any leads they would be much appreciated. The scale is in centimeters.
  23. RCFossils

    Help With Wisconsin Mystery Fossil

    I had a chance to collect an Ordovician aged roadcut in Southwestern Wisconsin (Platteville Formation). i found this unusual spiral shaped fossil and was hoping someone on the forum might recognize what it might be. It measures approximately a centimeter across.
  24. I visited SW Wisconsin last week and found a prone partial trilobite. This formation always gives me my best trilobites but they are always upside down. I guess beggar can't be choosy! Could anyone ID this bug?? And I am open to suggestions whether this is good enough to have prepped out by a "Professional".
  25. Hi everyone. Haven't posted in a long long time. Been trying to get back out there to some sites in the upper Midwest. Took a day trip recently to several sites within the Platteville formation of western Wisconsin. Did a lot of research and looked at some previous posts by other members here - but I was going in pretty much blind to the various roadcuts in terms of where I should be looking. Took a while but started to have some luck. A second trip would probably turn out far more productive as I have a better understanding of the what is in the different rock strata now. I found
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