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  1. The concretions I've collected recently are like a jigsaw puzzle. When struck many pieces come apart, mostly along the lines of the fossils. So would it be better to try the freeze thaw method for safer opening of the concretions? The one in particular has a possible large Ammonite in it but is trapped by matrix and shells. Hitting it is out of the question and only a stronger air scribe would be considered, which I don't possess, ATM. Ideas are welcome. Steve
  2. Concretion found in the lethbridge, Alberta river bottom. Broke it open to find a bulbous shell formation within. The Tyrell museum is looking at the photos but I’m curious if anyone could come up with an ID in the interim. IMG_4536.mov
  3. Sauropod19

    Mazon Pit 4 concretion

    Hello! I had the privilege of joining ESCONI to Mazon’s Pit 4 yesterday and came across this concretion. There’s a very good chance it’s nothing, but I thought the 3D shape might be peculiar. The concretion is about 1.5 cm wide in total. Thank you for looking!
  4. jamesKJ

    Herman mo

    Any guesses on what is trapped and sticking out of the concretion.
  5. jamesKJ

    Herman mo

    Closeup of projection from concretion
  6. Hi everyone. I was up in northwest Pennsylvania a few days ago seeing some friends and found this wild thing on their property. It's not my usual hunting grounds and I wasn't particularly looking for fossils at the time, so I never bothered to do research on the area. What I can tell you is that it was found in northern Crawford County, PA, which I believe is Devonian (but may also be Mississippian). Nearby were some brachiopods in sandstone. If extra pictures are needed, just let me know. Please help!
  7. val horn

    mazon creek unknown

    I went surface collecting, looking for fossils near Terra Haute Indiana and and came home with a number of concretions. Most were pretty plant fossils, and one was a plant hash plate and then there was this concretion. I dont know what to make out of it, so any help or suggestions will be very welcome. It is approximately 3 inches by 1 inch , and I am showing upper and lower sides.
  8. ASonney

    Concretion or Something Else

    I apologize for the images. The piece is about 6-7 cm. Found on a Lake Erie beach in New York. Any ideas?
  9. Rockwood

    Fern seed ?

    From the Mazonia wildlife management area in northern Illinois. Is this a fern seed ?
  10. Desrosiers1718

    New fossil prep project

    Been slowly working on this fossil concretion using a dremel tool and some coats of B72, slow progress but I am starting to expose some of the bone. Can anyone give me any tips or advice, this is my first time doing prep work on bone.
  11. finally1one

    Coprolite, Ferrunginous Concretion?

    Hi all, last week I found an interesting rock formation that appears to be cropolite. At least based on a few images I was able to compare it against online. The formation was found on an island beach off the west coast of Michigan. Thank you for any help identifying it!
  12. Ordinarily I would throw something back if I didn't have at least a tentative ID when I saw it or some strong reason to believe it's a fossil, but this I really wasn't sure about. I have no idea what they might be, but I had never seen a concretion quite like them before in the brook, and I found it even more bizarre that I ended up finding two of them. Any thoughts?
  13. CrustaceousBaki

    Mazon Creek ID help

    Earlier this week I had 2 concretions pop open that I weren’t too sure of what they were. Number one has the calcite desiccation cracks that are consistent with Achistrum sp. I guess the shape is what is kind of throwing me off, and the body seems to segmented, which reminded me of a millipede. Number 2 I cant really see any discernible features in it at all but if I had to guess a type of a polychaete worm? Anyway I’m gonna leave this to the experts lol. Any help is appreciated!
  14. Central AL Pottsville Formation What are these round, flat cookie shaped things? Stromatoporoids? Mineral concretions? Thanks for looking!
  15. CrustaceousBaki

    Mazon Creek ID

    Finally after a streak of bad luck with my concretions I think I’ve found something. First concretion I am almost certain contains something. Looks to me like a worm (?) Second I’m not super confident on but looks different from a lot of the other duds I’ve opened. Wouldn’t have much of an idea of what it could be. Third definitely also looks like something to me, one half did break a bit but I should be able to fix that. I hope the pictures are in order! I will try to fix if not. (I put the penny for scale if that helps)
  16. I do lapidary, and cut a lot of rocks. I bought this one, and eventually cut it in half. I assume it was a concretion or a solid geode of sorts. Still interesting so I will send you a few photos. Thank You David
  17. Hello everyone! My name is Paul and I have recently started collecting (or at least trying) and I was wondering if anyone could give me some advice on opening Mazon creek concretions. I made my first two trips last weekend and I think I have some concretions and have been using the freeze thaw method of opening. There are a few I gathered that seem to have what I've been calling an "egg" inside and I am wondering if this is just a rock with an outer layer, or worth freeze thawing until it finally pops. I attached photos of a few of these, one which I stripped of the entire outer la
  18. Hello All- I'm hoping to get some help with a few Mazon Creek concretions recently picked up around Braidwood/Mazonia. I believe this is pit 11. Have had some great help here in the past, so hoping to get some help with these 6 specimen below. I have an idea on some of the below but, but not sure if my eyes are seeing what I want to see- so curious to know if others see the same thing! thanks, -tom
  19. Would like to label the species if possible, I'm hoping the antennae help? Found in Washington (the beautiful one) 260238205_Crab2_83mm.tif Antennae.tif
  20. So I found these in my backyard while working on my chicken coop and I don't know if they are dinosaur eggs or concretions
  21. aaronm1990

    Round concretion?

    Ive found a spherical concretion in uk. Its dense and doesn't feel hollow at all.
  22. My brother found this while hiking I believe around Mammoth Lakes, California. Its almost perfectly round and feels somewhat light so it may be hollow. Google says its a concretion. My mom thinks its a Geode. What do you think?
  23. Tales From the Shale

    Mazon Concretion ID

    Hello all, this is a small concretion I broke by hand from the Mazonia Braidwood locale. Concretion is 1.1 inch or 2.42 cm in diameter. I'm thinking it's simply empty, however in the event it was a hard to see jellyfish I figured I'd ask. I think animals usually appear as white carbonized silhouettes but some of the jellyfish appear colored.
  24. apple3.14

    Fish soft tissue

    I have found a lot of shark or other types of fish cartilage and bone from this site but this looks like soft tissue. The preserved part has several layers with 1 side of the layer being mostly smooth and the other having the textured surface. The concretion is about 4cm long. Any information or other possibilities would be very helpful.
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