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  1. My winter has been spent thinning and organizing some of my fossil formation collections. The Platteville Formation has been one of my favorites as it produces that occasional spectacular trilobite. My biggest problem has been with some brachiopod identification. Thankfully, @Tidgy's Dad,s Ordovician post has made it relatively easy with the more common brachiopods. Finding great sources for the Platteville is hard. Many of the specimens shown today are MUCH smaller than the normal brachs from this formation. All are numbered and my measuring device is worn and didn't show through too well, so I added sizes. 1 is Campylorthis like but not the same as my others. 2 is similar to Hesperorthis but the valve appears too round. 3, 4, and 11 are plump Strophomena like brachiopods with the height maximum midway, not toward the back as my other Strophomena are. 5 is a confusing Strophomena like brachiopod. It is deeply concave, not showing up well on this photo. It is opposite of the Oepikina which is convex. But their hinge lines are similar. Rafinesquina was a guess but no listing of it in the Platteville. 9 is very ornate! 12 reminds me of Zygospira but can not find mention of it in the Platteville. I considered Rostricellula but a sulcus is not present. 13 is deeply concave, not captured well in the picture.
  2. While cleaning some fossils this week, I came across this large hypostome. Its size would lean me towards Isotelus, but it just doesn't look right. Is it a different species?? Did anyone notice the SMALL hypostome on top of the large one? Any thoughts on it? Thanks for looking. It was found in the Platteville, Ordovician of SW Wisconsin.
  3. minnbuckeye

    Trilobites for identification

    Here are a few trilobites, damaged and partials that were found this summer. After cleaning these up over the last few days, I still am unsure of their identities. The first one I will venture is an Isotelus roller. Rollers always confuse me! It is from the Maquoketa/Ordovician and Isotelus are common. @Kane, @piranha 3. is also from the Maquoketa/Ordovician. Maybe not enough present to tell. The rest are from the Platteville/ Ordovician. 4. Popped out of the matrix during prep. It measures 2.5cm by 2.0cm. I count 9 thoracic segments. This is the back side showing a probable pygidium. Interestingly, the depression in front of the pygidium has a positive to it (saved) which makes me wonder whether it could be a hypostome. I will research further once I can identify the species, or at least genus. 2. Is a smaller trilobite, 2cm by 1.5cm and contains 8 visible thoracic segments, though the end is not complete. 5. This specimen is the real reason that the post was created. It has me completely stumped. Unfortunately a piece is missing. I did not see this in the rock until I began processing a different fossil. Hence the other piece is back at the roadcut that this was found at. Anyways, I suspect but not convinced it is a trilobite. The green dots in the first picture show the fractured area. The dark fuzzy area delineated by the red dots is perpendicular to the fractured face. It was hidden in rock until the Dremel exposed it, The exposed surface is very rough compared to other trilobites I have found. Because of this I was hoping to have a better understanding of what is within this rock before prepping further. Here is what I envision as a possibility Thanks for taking a look!
  4. Tales From the Shale

    Monster Nautiloid

    Never thought I'd see the day where I would hold one of these. But that day came this Saturday when my girlfriend found this. Location: SW Wisconsin Sinnipee Group- Platteville fm Age: Ordovician Total shell Length: 25 in/ 63.5 cm Total diameter of living chamber end: 6.98 cm Living chamber end siphuncle diameter: 2.22 cm Total diameter of tapered end: 3.49 cm *note the tapered end has matrix, however it was still able to be measured semi accurately. Tapered end siphuncle diameter: 1.27 cm The siphuncle appears to be off center. However there is extensive wear, so I'm not sure if it's a result of environment or an attribute of the shell. Much of the shell exhibits a ribbing texture from the septa. They are angled, and not perpendicular to the ends. Apologies for the difficult lighting, I tried to excentuate this trait with an illustration. The ridges formed from the septa appear to sit around about a 15° angle. This feature runs the length of the shell, and I was able to count 82ish from both ends completely. Again, in most parts of the shell it's very hard to capture in images, so I've tried to show it in some form as much as possible. I would love any help on this, I've tried to be as meticulous as possible.
  5. Tales From the Shale

    Platteville Cephalon

    Found this today in the Platteville formation, SW Wisconsin. In the Mifflin member specifically. From what I see, it looks like a trilobite cephalon? I'm thinking Thaleops ovata. (Cap for scale)
  6. Tales From the Shale

    Wisconsin Ordovician 09/27/22

    Years of searching Wisconsin's various websites and old Geo surveys have always yielded varying levels of success ranging from mediocre, to misses entirely. Not this time, this is effectively the best hunting I've ever had in my home state. Period: Ordovician Formation: Platteville Location: SW Wisconsin Endoceras? I say that primarily based on size. Goniaceras, the flattened curved shape seems to support that? Gabriceraurus mifflinensis? It is a fragmentary cephalon, but that species is more common than other Ceraurids that I've read about. Sinuites? A common gastropod, I saw maybe 30 of these, but only grabbed a few. Unkown gastropods and a large bivalve that I recovered. I've only ever found one other bivalve from Alabama. An unkown brachiopod. Reminds me of Enteletes from Kansas. I really can't seem to find anything on these at the moment. A Strophomenid brachiopod. These are my favorite variety, I've got at least 200 from Michigan alone. Some various hashplates with Rugose corals, gastropods and other various Fauna. I found 3 productive locations worth a repeat on my scouting trip. Here was a singular find I recovered out in the boonies near the Iowa border. Ive got some 3 and 4 foot long associated crinoid stems from Kentucky, but this is far better than any little fragement I could ever get in Milwaukee. Measures roughly 7 inches. This trip was a real game changer, I understand now that Wisconsin is ripe for fossil plunder, for those able to find its secrets.
  7. This spring, a trilobite was found in the Platteville/ Ordovician that I have tentatively identified as Bumastus (Bumastoides) milleri, at least until @piranha proves me wrong. The point of this post is to give credit where credit is due......... The prepper of my find was the fabulous @Ptychodus04. Thanks so much for the great work!! Mike
  8. 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.
  9. 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 has a single costa rather than the several apparent here and in the types of Ptychoglyptus. Platteville Fm, probably in P. undatus biozone = Upper Ordovician, Sandbian stage (old North American Turinian Stage)
  10. 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 members of the Platteville Formation. The lower massive dolomite is the Pecatonica Member, the middle thinner bedded limestone layer is the Mifflin Member, and the slightly thicker bedded limestone above is the Grand Detour Member. These can be tough to differentiate on unweathered outcrops, but become quite distinctive after weathering. Next I checked out a couple of my favorite Maquoketa Formation stops in NE Iowa and had some luck, although I have nothing to show as everything is off being prepped. I also stopped at a very long roadcut exposing the top of the Decorah Formation and the entire Galena Formation. This picture shows the contact of the Ion Member of the Decorah and the overlying Dunleith Member of the Galena. The Ion is well known for having an abundance of the gumdrop bryozoan Prasopora. The one on the right below is itself encrusted with other bryozoans. This was the end of the first day. On the second day, I made my way up to SE Minnesota for the first time. The picture below shows the contact between the Prosser (Dunleith equivalent) and Stewartville (Wise Lake equivalent) Members of the Galena Formation. The Stewartville is well known for the lovely large gastropod molds that can be found, such as this very displayable Maclurites. I finished off the trip at two sites in the Maquoketa. Graptolites were probably the most commonly encountered fossil, although they weather quickly and you need to split rock to find nice fresh examples. And to finish off the report, here is the best of the trilobites I found. The cephalon has some damage, but it is otherwise a nice inflated specimen. Anataphrus vigilans Elgin Member, Maquoketa Formation Fillmore Co., MN Prepped by Malcolm T. Thanks for looking, hope you enjoyed!
  11. 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?
  12. 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 center and noticed and when I looked it may have a similar trilobite? Thanks, appreciate your help!
  13. Tetradium

    100_9177

    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.
  14. 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 all the way through as far as I can tell. Some possibilities: stelleroid crinoid (but where anatomically? cystoid (but where anatomically? Up for other ideas or insights. Seen anything like this before?
  15. 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!
  16. 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).
  17. Crusty_Crab

    Trilo??

    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?
  18. @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 the air. To show their appreciation for my time, I was gifted a few fossils. Cretaceous ferns and shark teeth. THANK YOU!!! Randy and his wife (see, I told you I would forget your name) are such a lovely couple, and I love it that both husband and wife like to fossil hunt together. While scouting the area ahead of their arrival, I stumbled on this stromatolite that I would love to set in my back yard as a table. This site has all of the normal Ordovician fossils which "Randy's wife" concentrated on. But I sensed ahead of time that Randy had an interest in finding a trilobite and he was successful!!!! Notice the X. It marks Randy's honey hole!! Don't tell him I showed you. A close up of his trilobite: A nice complete roller of an unknown trilobite to me, to go with countless pygidiums and cephalons of many species. @piranha Not bad for a few hours hunting. Here are a few more from this site, unfortunately, some found after their departure. Isotelus? Hopefully more embedded in the matrix. This is going home to Pennsylvania. This unknown specimen was found too late to send it with: I just noticed in the last photo something bumpy below the trilobite. An eye? Next is a Cerarurus?? Unfortunately, bit weathered. This site is where I found my complete Dolichoharpes reticulatus so it was surprising another great find came my way. Not nearly as rare but absolutely complete. A Thaleops ovata. Both points on the cephalon are there and the genial spine on one side perfect, the other side hopefully embedded in the matrix. I will have this one professionally prepped to ensure the front of the trilobite can be displayed properly.
  19. 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!
  20. 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)
  21. 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.
  22. 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!)
  23. 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 evaluate this and give me their opinion. Maybe, just maybe something special??? I will cross my fingers. Thanks for the opinions, Mike
  24. minnbuckeye

    Trilo-bits

    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
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