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  1. I thought everyone in the Fossil ID forum would get a kick out of this one.
  2. JimTh

    Popped some Mazon concretions

    Hi folks, I went to the spoils pile with ESCONI pre-covid. I've had a bucket sitting out back ever since with concretions. Went through it today and banged a few together. I am not good at recognizing Mazon material, so I thought I would ask for some assistance here. I'm 99% sure 1A is a jellyfish, I haven't sorted out the name yet though. 1B appears to have some whiskers or antennae, so I'm hopeful it's some sort of shrimp or creepy crawly. The rest I'm kind of at a loss on. Any help appreciated!
  3. Tr0xy

    Fossil concretion?

    Hello. I found this fossil matrix in my teens in an area of Northern California that's part of the Chico Formation. The surrounding sea shell fossils were in a layer of hard dark grey shale in a cliff face. I found this loose piece halfway down the hill up against a tree. I was told at the time that it's a concretion. I've never seen a concretion in person but they always look almost spherical in photos online. It weighs 5lb or 2.26kg Shaped like a sectioned log. layer of fossils running horizontal throughout what I've decided is the bottom. Sediment layers in vari
  4. Found this interesting rock and it has me scratching my head but it sure looks like some sort of egg or maybe the pit of a large fruit but then again it could be a concretion but I have my doubts about that. Hope these pictures have the clarity needed for good judgement.
  5. The inside and the outside! What is this? Found in a bunch of river rock/decorative rock from who knows where.
  6. Hello everyone! Today I ventured out to the Mazonia-Braidwood State Fish and Wildlife Area for my first time, and it was… something. This post is going to serve as both a journal of my day, and as a request for assistance as I try to figure out what exactly a concretion looks like. Once I got my permit outside the office (which is just down Huston Rd a bit from the IL-53 and Huston Rd intersection; this is for people like myself who struggled to find an address or location of the office), I headed to Mazonia south unit, where I went to fossil hunting site 3. There were not really a
  7. Hi All I recently hiked to a remote area and only found one fossil, but it's a doozy! I've been wanting to find a shark tooth concretion since I heard about them so I was pretty happy when I found this concretion with what looked like a row of teeth and some cartilage in it. I don't think it's common for cartilage to fossilize this well so maybe the rostrum was really dense? I'd love to know what some of the shark tooth experts think about this one! I've started prepping it and there are numerous teeth still inside the concretion. I had to stop with the air scribe and move to acetic
  8. Here is a video I just published that is just over 1 minute in length. Very funny too. I have an absolute blast putting this together. Enjoy
  9. ncain444

    New fossil

    Hello, I am new here. I am looking for information on this concretion I found.
  10. ncain444

    New fossil

    Hello, I am new here. Just looking for information on this concretion.
  11. tom_mo

    Mazon creek fossil id

    Hello- I am hoping to get some help with identification of a few concretions. These were all found in Mazon creek pit 11 area. Unfortunately, I was only able to find one side of these. The second to last may not be a fossil, but it has a really interesting/symmetrical shape so added it in just to check. I’m happy to take additional photos if needed. thanks in advance, this forum is always very helpful and knowledgeable when it comes to identifying! -tom
  12. As it's too stormy to collect fossils... Jurassic, Callovian, Oxford Clay, Peterborough Member, Whittlesey, Cambridgeshire. This was something very odd I found from a concretion in the Oxford Clay. They are great for three dimensional fossils such as ammonites. It looks like wood, in which case it's my first bit that isn't carbonised, or possibly bone. It could also simply be mineral. Another possibility is fish. I really wish there was more of it, that might have cleared it up, and would appreciate your thoughts.
  13. Samurai

    Nodule #5: Fish Cartilage

    From the album: Muncie Creek Shale Phosphatic Nodules

    One of my larger concretions and personal favorites
  14. Hallo all, please can somebody help me with ID ? Cenoman ...
  15. Neon

    Wonky concretion

    Howdy! I was working on this medium concretion that I thought would have been a crab but after reaching little less than half with a hole and not finding anything I decided there probably wasnt a crab in it and cracked it open. After opening it I saw this, looks like just a crab arm but wasnt entirely sure. Theres been two other concretions from this area that seem to only be arms, havnt finished prepping them, and wasnt sure if its common for washington concretions.
  16. Howdy yall! Its been a while sice I posted because on the same day I collected these concretions me and my digging buddy collapsed a chunk of the cliff onto ourselves and broke a few bones (Its all okay now and also congrats to whoever collected the concretions in the rocks). But all I have is a dremel 290 and these are gigantic concretions that I dont think I can prep by myself. I was just wondering if yall though it would be better if I just bit the bullet and got an actual set up or a ball park price to get someone else to prep it (I really want it well done another reason to get someone el
  17. toddf74

    Mazon trip Nov 14, 2021

    Hello fossil hunters! I am asking for some help as a humble beginner. Yesterday I went out with my son (age 14) to a site just south of Braidwood, IL. We were collecting near Ponderosa Lake, to be more precise. This is our second trip out there. The first time we really had no idea what we were looking for, but now we are getting a little more experienced after reading a lot and digging around. In total we found around 60 intact (good shape, in my unprofessional view) concretions, as well as some interesting fragments. We had a nice time collecting yesterday in the cold. We were t
  18. Lone Hunter

    Coprolite, gastropod, or other?

    Found this in creek, Eagle Ford, at first thought it was part of gastropod but after closer inspection it started looking more like coprolite now I'm undecided so I will leave it up to the TFF court.
  19. Cretaceous Eagle Ford concretion that caught my eye, one part of this disc has what looks like strange sutures but this would be one flat Ammonite if that's what it is so I'm stumped.
  20. erlon

    What is this?

    Found this laying on the surface of a flat sandy area in southern Maine. I'm not sure what it is.
  21. KitKat


    Hi all, this is my first post here. I found this the other day on a north shore Long Island NY beach, down at the water's edge. Looks like a partially peeled hardboiled egg. Was wondering what, if anything, it could be? I've tried to research as much as I could, but running into dead ends. Thanks in advance!
  22. Not the most exciting start to my 1st mazon creek freeze/thaw attempt, but at least its not blank. I am guessing some kind of plant material
  23. One more plea for help - and apologies if this is obvious to all the folks here who know their stuff. Found this on the Potomac River near Montross, VA (the Northern Neck area as it's called). Any help or guesses would be very appreciated.
  24. I found fragments of a cephalopod at the Lost Creek spillway site near Jacksboro Texas on August 21, 2021. Pennsylvanian, Graham formation, Finis Shale member. It includes a 90mm long section and two short phragmacones. The 8 pieces of the longer section were found adjacent to each other and fit together perfectly but the two smaller pieces were a few cm away and no points of contact could be confirmed. The long section exposes the inside of part of the shell and is encased in a concretion on the outside, not the usual way these are found. The smaller pieces exposed the
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