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  1. DarasFossils

    Miocene Pea Crab Preparation

    Hello, I am new to fossil preparation but I bought one of those Miocene Crab concretions, but I am not sure how to separate the rock without damaging the crab inside. I only have dental tools and chisels, but they are not enough to separate the two sides for a pos/neg display that I could like. What sorts of tools could I use for the job? It is something similar to the picture below.
  2. MudstoneMullusk

    Ghost Shrimp Carpus

    What I believe to be a carpus of the major chela of a ghost shrimp. Not an unusual find for me, but this was found near an exposure of Pittsburgh Bluff formation where previously I have only found them in Astoria formation.
  3. ChrisSarahRox

    Just a rock?

    Was very curious as to how this one came to look as it does. Any help is appreciated. Some of the photos are before and after a good cleaning.
  4. ChrisSarahRox

    What kind of rock is this?

    Looking for help with this one, any input is welcome. Found in Grant County NM near the Gila National Forest.
  5. Hi all Just a quick question , I have been very interested in the material from Mazon Creek since I won a great auction lot from Ralph that included a few fine specimens . While looking today online I spotted a trilobite pygidium that was labelled Mazon Creek it looks like the right type of siderite concretions but it could be from some where else . So what do we think? I don’t think they was native to Mazon creek but maybe transported there by floods ?
  6. Hello all! In my hunt to find crab concretions I started out at the beaches of the Olympic Peninsula. I wanted to share what I have found! I have gone three times so far and the close to six hour round trip was a bit rough, but very well worth it and I can't wait to learn and discover more. I am struggling to find crabs, but I am continuing my research and hope to figure something out soon. If there is anyone that could point me in the right direction that would be greatly appriciated as well! The first concretion I opened, It took no effort to crack. I speculate it cou
  7. My son picked this up while visiting his grandpa. We aren’t sure but know it’s probably a concretion. Would love it to be a real egg!
  8. Sauropod19

    Mazon Creek find

    Hello! I recently went to Mazon creek and was in the process of thawing my concretions when I saw this, and was wondering if y’all could help me ID it. I’m thinking maybe a shrimp, but am not very familiar with the fauna (or flora for that matter) of the area. Thank you!
  9. Location is in Missouri The area is dated to the Pennsylvanian Formation: Muncie Creek Shale Found this very small tooth like structure and was wondering if anyone could confirm if it is a tooth or not. Normally I can identify teeth if they are large enough, but this specimen is very small. I have found teeth before in these concretions but much larger such as a possible Symmorium or Glikmanius along with a tooth from a member of Eugeneodontida. Here are some images I edited that might make some details more clea
  10. Vopros

    Fossil wood?

    I wonder what do you think about this opalized ironstone https://www.mindat.org/photo-1239325.html can it be a wood?
  11. mary61948

    Help identify please

    Can anyone help figure out what these heavy rocks are?
  12. I have tried looking up the difference between a concretion and nodule and can’t seem to get a clear answer. I have seen both terms used on the forum but don’t know the difference and would like a clear answer so I can know what I’m talking about. Thanks ahead of time!
  13. I thought everyone in the Fossil ID forum would get a kick out of this one.
  14. 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!
  15. 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
  16. 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.
  17. The inside and the outside! What is this? Found in a bunch of river rock/decorative rock from who knows where.
  18. 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
  19. 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
  20. 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
  21. ncain444

    New fossil

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

    New fossil

    Hello, I am new here. Just looking for information on this concretion.
  23. 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
  24. 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.
  25. Samurai

    Nodule #5: Fish Cartilage

    From the album: Muncie Creek Shale Phosphatic Nodules

    One of my larger concretions and personal favorites
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