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  1. suburbanamateur

    Hello

    Hi, I am a graduate student from Chicagoland looking to get into fossil hunting. I recently started school in Wisconsin and I am hoping that I can make some good finds in this state. I have tried fossil hunting in the Mazon Creek area of Illinois, but I only ever found a single horse tail fossil and a hermit's shanty over there. Overall, the area is a pain to search unless you have a boat to access the islands in the lakes and I am hoping I will have better luck in Wisconsin while I am here.
  2. This ia an object I found on a gravel path on the southern shore of Lake Mendota in Madison, Wisc. I always thought it was a fossilized shark tooth, but after finding this discussion, I'm not as convinced as I once was. Any comments would be appreciated. Thanks.
  3. I went to the beach in Doctors Park in Fox Point, WI over the weekend to hopefully find some Silurian reef fossils. Most of the stuff I saw were poor-quality brachiopod fossils, but I these look kind of interesting. I think the first one might be some kind of a coral, but it does not match any coral fossil descriptions I found on online guides for the area. Yet, it looks more organic the usual porous rocks I on the beaches. I don’t know what it make of the smaller one: it seems to have more of a pattern than the typical rocks I find that look like a bunch of clams fell into a concrete mixer. But, again, it does not match anything else in the local guides. Also, if anyone knows, what kind of rocks typically bear fossils in this area and how to you go about opening them? I’ve only ever used the freeze and thaw method for concretions I found on Mazon Creek, IL, but the stones I find here are completely different.
  4. Hello, I've stumbled onto this site while doing research on doing scientific illustrations of green River fish. I've prepared many specimens over the years, but now want to do accurate illustrations of these fish. The research involves gathering as many fossil images as possible, and then finding living relatives and using them as references. Very time consuming, but for accuracy, one cannot find enough references.
  5. Teemaldrich

    Hello - What is this please

    Hello nice to meet u
  6. suburbanamateur

    Bivalve fossil or something more recent?

    I was at Atwater Beach at Shorewood, WI for a couple of hours today because a cursory online search showed that it’s a place where people have supposedly found Silurian Reef fossils. I did not find anything of note except this rock that looks like a bunch of clams fell on wet concrete. I’m only second-guessing myself because the beach is littered with tiny mussel shells, as well, and I know it would not that that long under the right conditions for bivalve shells and sediment to become squished together into one mass. I have found some rocks that definitely looked like that. But, this one is much heavier and I only see what looks like indentations, not the shells themselves. Not to mention, the patterns on the ridges do not look like those of the native mussel shells that litter the beach. The second picture is the back of the thing.
  7. aquaticrooster

    Possible bryozoa colony?

    I found this heavy triangular piece of what appears to be a bryozoa colony ,but at different angles and lighting I find it to show several other possibilities. This was retrieved from a receding river bed amongst many more corals and lingulla plates I also gathered. If anyone has an input or correction to my guess ,I greatly appreciate it.
  8. Curiocurator

    Fossil found in Wisconsin River

    Hello! We found this in a river bed in south Central Wisconsin. What do you think it might be? Some of us think it is a mushroom and something maybe a seashell. Thank you!
  9. In my Secret Santa gift last Christmas from @connorp I received (among other nice items) a very nice little hash plate from the Mifflin Member of the Platteville Formation (U/M Ordovician, Blackriverian, ~453 MY) from SW Wisconsin. The picture below is the plate as it was received and in my 12/20/22 post about getting it I said: “A great hash plate. I already see two or maybe three different trilobite types with a couple of them tantalizingly partially buried and an interesting gastropod that I am not familiar with. I think a little prep work will make this even more spectacular. As an added plus, it represents my first fossils from the state of Wisconsin.” I finally got around to doing the prep I talked about and spent a little time exposing some of the more prominent fossils and giving it a gentle going over with air abrasion to bring out some of the features. I think it looks even better than it already did and I was even more impressed with the wide variety of fossils on the small section of rock. Below is the cleaned up plate: Here is a collage of the plate just turned at different angles to the sunlight in case it helps to bring out any features: There are hundreds of fossil fragments on this one small piece of rock, but I want to highlight the top couple dozen specimens. With the help of some TFF members via previous posts and replies in a couple of ID threads I put out (thanks @Tidgy's Dad, @connorp, @piranha, @minnbuckeye and others), I have identified several trilobites, brachiopods, gastropods, ostracods, bryozoans, and a crinoid and want to show you this wonderful diversity in such a small space. If anyone sees changes to my ID's please feel free to chime in. Some will be very specific ID's and some will be a bit more general. The picture below is the key to where each of the numbered specimens is on the slab (see number in upper left of each specific picture). We will start with the trilobites. Although each is only a partial, there is enough present to get a pretty specific ID on most of them. All are new genera or species in my collection. Here are the brachiopods: Here are a couple of specimens of a really neat gastropod which was new to me. So often it seems Paleozoic gastropods are just internal molds or rather plain forms, but this first one is very nice. Here are a few bryozoans and one very small horn coral. There were several of these small corals, I'm not really sure of the ID, I didn't research them much yet. Just a couple of small crinoid columnals were found. And last but not least are the ostracods. I am used to small ostracods (which some of these are) but there is also this one form that is huge (by ostracod standards) coming in at about a centimeter long. At first I thought they were brachiopod fragments until I looked at them closer. These things are the size of a kidney bean! Note the scale difference between the Eoleperditia and all the others. Most of my ID's are questionable as I was using a reference that is for the immediately overlying Decorah Formation until I can find a listing for the Mifflin Member. OK that is everything for now. I hope you have enjoyed the wonderful diversity of this small slice in time. With a little more investigation, I may yet tease out a few more specimens worthy of an ID. Thanks for looking. Mike
  10. Please help identify. I have been trying to find any information on this fossil I found while digging here. its been a long search. I have been told a few thing but have been told here is the place to get things identified. I have only cleaned a few sections because Im afraid of breaking it. it is semi fragile and other sections are very hard.
  11. sleepyjoe

    Small Silurian Trilobites?

    Hi, I was recently looking at some small fossils under magnification and think I might have a couple trilobite parts mixed in with a bunch of brachiopods? One fossil appears to be a "cheek" and is about 8mm on it's longest axis, the other appears to be the side of the body and is only about 3mm long. These are from the lower Silurian in Door County, Wisconsin, USA. This area is part of the Niagara Escarpment and trilobite fossils are pretty rare in this area (although I'm sure they were here). I work at a local museum and I'm trying to put together a comprehensive list of confirmed silurian fauna specimens actually found in the county. Thanks in advance for your help! Joe Taylor
  12. Baking Geologist

    Joining the fun from Illinois

    Hello! I’m Ellen B and I’m currently living in far NE Illinois where there is plenty of glacial till and a brevity of outcrops. By day I do computer support now. But I have a MS in geology with a specialty in sedimentary rocks and paleontology. I also am a hobby baker hence my moniker.
  13. I have a nice little slab of Platteville Formation (Mifflin Member) from the Ordovician of SW Wisconsin that I received from @connorp late last year. I am working on a post that describes all of the great things in it, but want to get a couple of ID's cleared up so I can be more concise in that post. Here are three trilobite pieces found on the slab that I have taken a stab at an ID, but would love confirmation/correction. Hopefully there is enough there for some of our trilobite experts such as @piranha , @Kane or any others to offer some advice. Thanks for any insights anyone can offer. Each picture is numbered in the upper left. Mike Here is a picture of the small slab with the location of the trilobites in question numbered. The sharp eyed will see another trilobite cephalon in the lower portion of the slab. I am fairly certain that one is Gabriceraurus mifflinensis. Here is the first question. This looks like the best match I can find for species listed from that formation, but I'm not certain. I wish I could get this one a bit cleaner, but the matrix left is pretty hard and stuck to the pygidium. This one may be a stretch as there is not much there, but maybe enough to be recognizable (or maybe not). Thanks for any help.
  14. I have a nice little slab of Platteville Formation (Mifflin Member) from the Ordovician of SW Wisconsin that I received from @connorp late last year. I am working on a post that describes all of the great things in it, but want to get a couple of ID's cleared up so I can be more concise in that post. Here are 8 brachiopods found on the slab, some of which I feel pretty good about the ID (but always open to corrections) and some I have no clue on. I have been through several posts by @Tidgy's Dad, @minnbuckeye, and others but still need some help. Thanks for any insights anyone can offer. Each picture is numbered in the upper left. Mike Here is a picture of the small slab I'm pretty sure on this one (#2 below) even though much of it is not visible, but I think the shape and coarse ornamentation gives it away for the species found in this formation. I am torn on this one and despite the beautiful preservation on the exterior. It would be really helpful to see the interior or even the hinge line. But I'm hoping this will be distinctive enough for the experts out there. Not really certain here, this was my best guess, but I could be way off. This one is hard as it is only partially exposed and right at the edge of the slab. Ornamentation is very similar to #3 above, but it has more curvature from what I can see. I'll try to put together some better pictures. This ID looks pretty good with the strong ridge down the center even though much of the shell is buried. I just don't know, there are several similar looking forms found in the formation. I wish I could get this cleaner, but that matrix is very hard at this point. But that ornamentation should be very distinctive, even if half of it is only peeking out. It almost looks more like some bivalves I have seen, but nothing like it in the Ordovician that I am aware of. Thanks again for any suggestion anyone can offer.
  15. SilurianSalamander

    Trilobite pygidium or brachiopod?

    Each square is one centimeter. What is this mould of? Thank you!
  16. SilurianSalamander

    Agatized/silicified cephalopods?

    Are these cephalopods in chert? They appear to be agatized as well. The first two pictures are from a chunk of chert and agate that I split to find what looks like the chambers of a nautiloid cephalopod. Is this a fossil or just some way silica forms? Thanks so much!
  17. This looks similar to some jawless fish bone I’ve seen. Could this be some? Ordovician, Wisconsin, Dane county, Madison.
  18. Tales From the Shale

    Estabrook Park 09/30/22

    I went to Estabrook two days ago just because I was in the area. I've hit this area multiple times before. Despite its low fossil yield I think it's an excellent place to start for any new fossil hunters getting into the hobby. The sole outcrop to be found here lies under the bridge overlooking the river rapids. It extends for roughly 30-45 feet. There are soils in the area that occasionally produce small bits of brachiopod and crinoid stem fragments as well. However I mostly keep to the main rock outcrop. Your most common finds within the park are tons of brachiopod fragments. If you're lucky, you'll find a complete one. I also frequently find dissarticulated crinoid stem fragments and ossicles, most are so small I usually dont collect them. The third and final fossil I've encountered were small (usually) bluish gray bryozoans. They can be found alone or mixed into hashplates with crinoids and brachiopods. I've heard of people finding trilobites such as Eldregeops and some unidentified taxa. I haven't collected any of these yet, however any newcomer could. One person I correspond with at my university claims to have found Placoderm remains from Eastmanosteus, but I have no evidence for that claim. Regardless the easy to access location and ammentities from the park make this spot excellent for people who have young children. Just be wise with your collecting, and stick to non hammer collecting, as the authorities frown upon that within the park.
  19. I've been fishing along Cedar Creek for years, and I know there are some good limestone formations along the creek. Anyone in the area know of some good spots to look for fossils? There's got to be some spots that trilobites can be found.
  20. SilurianSalamander

    Blastoid?

    Are these both blastoids? The larger one is about 2 cm across at its widest point and the smaller is about half a cm across. Ordovician, Dane county Madison Wisconsin. Thanks!
  21. I’ve been told these blastoids appear to be Mississippian in age. That surprises me because the rocks in Dane county Wisconsin are late Cambrian - early Ordovician and the nearest Carboniferous rocks are a long ways away. I’ve done some research into the history of the buildings on the UW Madison campus where I find these fossils and they were supposedly quarried only a few miles from where they now lie. I was also told that blastoids didn’t appear until the Carboniferous. From a quick google search I got the impression that, while they massively diversified in the Carboniferous, they first appeared during the Ordovician. I’m just confused and curious as to how old these rocks are. They’re packed full of fossils and I often find tiny fossils that have eroded out of them and fallen to the ground to collect. attatched are the 2 or 3 blastoids and some of the other fossils I’ve found in these rocks. Any help as to what the age could be would be wonderful! also any IDs on some of the other fossils more specific than “gastropod” or “cephalopod” or “crinoid” are also appreciated. Thank you so much! Y’all are great.
  22. SilurianSalamander

    Foram or snail?

    Been finding a lot of these tiny spiral shells. While some are definitely gastropods this one looks similar to some forams I’ve seen. Would love to know which this one is! Thanks
  23. SilurianSalamander

    Echinoid?

    Hi all! I found this tiny fossil today. It is a bit under half a cm long at its longest point. I can only imagine this is an echinoid but some confirmation would be great! Found in some very fossiliferous rock on the UW Madison campus in Dane County Wisconsin, known for being late Cambrian - early Ordovician. No clue where this rock was quarried. Thanks so much!
  24. Can you help determine if these are real as described and any steps I might take to further confirm the details? [seller verbiage removed -- Staff]
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