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  1. Hello, I found this as well as several more in different sizes in the woods near my home in Northern Michigan. Can anyone give me a clue what it might be? It is hard to tell from the photos, but many parts of this appear to be crystalized. Mostly inside the "holes". I have looked ALL over the area on hikes and have never come across anything even similar to this. They seem to be in just the one area.
  2. Found this stone awhile back, very smooth and round, and perfectly shaped like an egg! I live in the Thumb of Michigan, and found this in the rocks by some shrubs. All the other rocks were definitely not like this. Any ideas what it actually could be?
  3. Sammi21977

    Is this fossilized bone?

    Found in Manistee County Michigan. Can anyone help to identify?
  4. Cassandra Tiensivu

    Actinocrinites Plate or Echinoderm?

    After cracking open this packstone, I happened upon this odd little fossil. I did a bit more excavating to uncover the extra lobe. So far, the speculation is leaning heavily toward some sort of Actinocrinites plate. There are a few people pondering echinoderms. What are the general thoughts here on this piece? From South Haven, Michigan. Mississippian Coldwater Shale.
  5. So many different ideas have been tossed out for this piece now. I thought perhaps some folks who aren’t in the Facebook group I regularly post in might have some clue to be able to narrow this down. The tan-colored half seems to be two layers of diagonal lines stacked on top of one another in a crisscross pattern, creating the holes in between. This is another Mississippian Coldwater Shale packstone from South Haven, MI.
  6. Cassandra Tiensivu

    Part of a crinoid calyx?

    Now, I have never seen one of these before. But… it feels like a crinoid piece of some sort. Only two of the rounded edges are visible, but I believe there are six sides to this. It reminds me of a connecting joint piece for a puzzle kit. Found it after cracking open this Coldwater Shale packstone from South Haven, Michigan.
  7. Cassandra Tiensivu

    Possible bryozoan from Coldwater Shale

    Does anyone have any ideas as to what makes this sort of pattern? The opposite side was just a plain, smooth clay deposit. Found this Coldwater Shale piece in South Haven, Michigan, along the shores of Lake Michigan. I did have someone suggest Fenestate bryozoan. When I tried looking it up though, I found a ton of variants.
  8. Cassandra Tiensivu

    Goniatite in Coldwater Shale

    Hey everyone. I’m looking for more information on Goniatites found in the Mississippian Coldwater Shale. I found this little guy today after cracking open another packstone (second to last photo shows the host stone) I picked up in South Haven, Michigan, along the shores of Lake Michigan. Any insights you could toss my way would be greatly appreciated. Thanks so much for your time!
  9. This slab of what appears to be compressed mud came up when digging a basement. Has a lot of pieces of coral and shell. Looking for help with big item (white is color and looks like 3 pieces coming from a central core) in photo.
  10. ARandomFossil


    Hi all, my uncle found this on my property years ago, thought I would post it here. Any ideas? We live in the Northern Michigan.
  11. Hello again, I was doing some surface collecting in Oakland County michigan-- typically the fossils around here are preserved inside of pieces of limestone... I'm no expert on fish or sharks so I'm not sure what exactly this imprint is, but it reminds me of a tooth. Would anybody be able to confirm/deny this? The rock in question is about the size of a dime. Thank you!
  12. Hello everyone. I’ve been chiseling apart some of my less than fabulous Mississippian Coldwater Shale packstones that I find in South Haven (MI) on Lake Michigan. Typically, I’ll discover various brachiopods, a few gastropods, various bryozoan, some ostracods, and little bits of flora that look like tiny seaweed. However, recently I opened up a packstone with a very different fossil inside. I have nothing else like it in my collection. A few folks I know have speculated the things I mentioned in the title of this post. The second picture is... I guess I would call it a ca
  13. 30 years ago I was in 5th grade and used to hang out nearly every summer day at the back of our property in Van Buren County, field was nearly 60 acres. We would build forts and play in the creek that came off of the Paw Paw River. One day while we were in this deep depression in the ground that the creek went through we found a small black shark tooth. That summer we dug and dug and were able to find about 50 teeth. This week being Spring Break I told my small children maybe we should go look for shark teeth and told them what I did as a young lad. We went back to the old spot I remembered fi
  14. I have some exciting news, thanks to the help of @TqB, who suggested that this tabulate coral I found in southwest Michigan glacial drift a few days ago is much more interesting and unusual than I could have imagined! After thinking about and dismissing a number of favositid possibilities, we realized that this is a cerioid syringoporid. Tarquin suggested that, due to the appearance of domed and/or infundibuliform tabulae inside the transverse and longitudinal sections, along with a few apparent mural pores and a possible syrinx (mural pore tunnel) structure, this might be
  15. Hello, everyone, I could use some help with this odd little tabulate coral I found yesterday in an old gravel pit in southwest Michigan. I can't guess at a formation or age since it's glacial debris, but the things I find range from possible Ordovician (rarely) all the way to lower Mississippian. I think it must be either Devonian or lower Carboniferous. When I first picked it up, I thought it was just another type of Favosites, given the corallite shapes and what turned out to be large mural pores (towards the left) when enlarged: (EDIT: TqB has suggested parasite trac
  16. Hello! First time posting so I'm sorry if the formatting is wrong...anyways, I recieved this big trilobite as a gift from a shop here in Michigan. I'm afraid I don't have any other information, other than it was what I think is cheap for a fossil? Anyways, here's a few pics of this sucker. Thanks!!!
  17. Robert Rankin

    What do I have here.

    I have more photos but limited to only 3.95 MB. Egg?
  18. mcwal10

    Picked up at a rock shop

    Hello all, I'm not even sure if this is a fossil to begin with, as I'm an amateur fossil hunter. I found this piece in a rock shop called 'Prospector's Paradise', near the center of the Keweenaw Peninsula in Michigan. After talking to the shop owner, it sounds like it could have been found in the Northern part of the Keweenaw. It is possible that he did not find the piece himself, and could come from a different location. I apologize in advance, because it is not much to go on, and it's not a big deal if it can't be solved. The reason I thought it might be a fossil is because one side is
  19. These are so-called Petoskey Stones, as I found them along Lake Michigan shoreline. These Devonian age Hexagonaria coral pieces should polish finely.
  20. Here are some finds from a late August to early September long loop road trip, fossil hunting through Ohio, Michigan, Wisconsin, Indiana and Kentucky. I'll appreciate detailed specimen identification help. First photo shows brachiopods & a trilobite from the Devonian Silica Shale Formation near Sylvania, northwestern Ohio.
  21. We found the following in Harbor Springs, MI in July. Initially thought it might be petosky, but it’s a lot lighter in color and smaller markings. Thanks in advance!
  22. LisaL

    Halysites (?) specimen

    I found this pretty little chain coral in southwest Michigan glacial drift a couple of days ago. I'm interested in whether it's possible to narrow the ID down between a Halysites species or another genus, like Quepora. My simplistic understanding is that coenenchymal tubules would indicate a Halysites species, so that's what I've been focusing on, although I know there are many other indicators, like size and shape of corallites. size of ranks, shape of luminae, structure of longitudinal tabulae, etc. This piece is probably too silicified to tell without thin sections, anyway, but I thought I'
  23. I went up to the UP this week doing mostly sightseeing with my friends. They were aware of my predilection for rockhounding so we often made stops to areas that might bear good fossils/agates. In particular I knew there were some 'lagerstatten' in the Stonington Peninsula region of the UP. The most important formation I know of is the 'Big Hill formation' (correct me if I'm wrong). Some links about it here: https://www.researchgate.net/publication/308005515_A_new_Lagerstatte_from_the_Late_Ordovician_Big_Hill_Formation_Upper_Peninsula_Michigan https://www.ncbi.
  24. MagicPlants

    Various Fossils from Lake Michigan

    Hey everyone, New user here, very minor experience with fossils. I was curious if anyone would be interested in possibly identifying some specimens from Lake Michigan, from North Shore Beach in Ferrysburg, Michigan. It's on the West Coast of Michigan, but it would be the Eastern side of the Lake. Hope that isn't too confusing and I hope that I find you all well during these trying times. I have a couple more as well, if it's cool. Thanks for reading. Here are my humble hypotheses: 1: Some sort of Petoskey/Charlevoix stone or similar perhaps.
  25. MadeinMichigan

    Another Northern Haul

    Greetings! Each summer I visit a small, secluded town in the Northern lower peninsula of Michigan. This beach in particular is just loaded with fossilized corals and shells, and I always come home with some beautiful finds. The area is known for horn corals, petoskey stones, and a related coral fossil known as the Charlevoix stone. Take a look! *Note: the last jpeg is two pictures of the same stone.*
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