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  1. Hello, it’s been a while. I finally found some things that look half-decent at several Milwaukee County, WI beaches where there are supposed to Silurian reef fossils. Can someone help this amateur out? I included side and back pictures of some of them if there is anything visible from those angles that can help with ID. 1. 2. 3. 4. 5.
  2. I found this rock/fossil while walking along the shoreline of Lake Michigan in Southeastern Wisconsin, USA. I have never found anything quite like it previously. It has the appearance of a sliced swiss cake roll - concentric rings on each end and having a solid skin. My initial thoughts were some type of horn coral (though only the main shape is similar) or possibly a chert/chalcedony nodule that had both ends break off. Other suggestions (which are probably more likely) are Stromatolite or Stromatoporoid, but I'm not seeing any similar photos in my online searches. Someone in my Facebook group suggested that it is a ramose form Stromatoporoid. Side A: Side B: Edge/Skin:
  3. TerahB

    Rock identification

    My brother found this cool rock in his farm field in Cadott, WI (about 2 hours east of Minneapolis, MN.) He didn’t weigh it but said it’s heavy as you would expect. I touched it and it’s rough so maybe it originally broke off something? It didn’t feel like sandstone. It’s about 2.5 feet long and 8 inches wide. Thanks!
  4. Kurvinosaurus

    Crinoid fossil?

    Hello! I’ve been doing some fossil and rock hunting on a Lake Michigan beach in Wisconsin, and I was just wondering if this could be a crinoid fossil? There’s chain coral in the rock on both sides. I tried sanding a little around what I think is the crinoid, but I didn’t uncover anything else. Thank you for any help!
  5. PamAm

    Possible fossil

    This is both sides of rock found in southeast WI on Lake Michigan. I thought maybe a fossil.
  6. Selamore

    Unidentified Tiny Fossil!

    Hello! I found this tiny fossil in the Chippewa River in Wisconsin. I was agate hunting and I picked up this rock because it shares the characteristics of an agate. When I flipped it over I was surprised by the tiniest little fossil! I am hoping to get some help with identification. The actual fossil is about as big of a pencil eraser.
  7. Anomotodon

    Trilo-bit from Milwaukee

    Hi everyone! I visited an exposure of the Milwaukee formation within Milwaukee city, Wisconsin this weekend. Found lots of brachiopods, corals and bryozoans, and brought some rocks home. Then today I decided to smack some of them with a hammer - and this trilobite pygidium emerged out of nowhere. I don’t know a lot about inverts - can anyone help with the ID please, if it’s identifiable at all? I’m pretty sure it is from the Lindwurm member of the Milwaukee formation (Givetian - Middle Devonian). Thanks!
  8. suburbanamateur


    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.
  9. 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.
  10. 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.
  11. 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.
  12. Teemaldrich

    Hello - What is this please

    Hello nice to meet u
  13. 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.
  14. 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.
  15. 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!
  16. 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
  17. 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.
  18. 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
  19. 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.
  20. 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.
  21. 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.
  22. Hi Guys! I finally cleaned up the last batch of rocks from my papa and grandma‘s estate. I know from my last post that I’m not supposed to get some of them wet but they were filthy so I had to clean them before bringing them into the house. Any feedback you have is appreciated. if you saw one of my previous posts, you’ll know that my grandparents collected rocks in Arizona, Wisconsin and Illinois. Most of these are probably from Arizona. I think the one piece of orangish petrified wood #3 is very cool. I would love to know if any of the other ones are petrified wood. To me it’s sort of looked like a pork tenderloin when I was cleaning it today! Maybe that’s just because I didn’t stop for lunch. Ha ha. It was so fun to spend time looking at each and every one. I have a critter living in one of them. Some sort of insect. I did my best trying to encourage him to get the heck out today using water and air but I might have to pull out the tweezers tomorrow! Thanks for looking and have a great week…
  23. SilurianSalamander

    Trilobite pygidium or brachiopod?

    Each square is one centimeter. What is this mould of? Thank you!
  24. 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!
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