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  1. Paleo_Adventure

    ID Assistance Please

    Hello, I purchased two of these years ago. I was told it was coprolite. Since then, I have learned allot and have doubts this is actually coprolite. So, what is it? As seen in the pictures, they look like a ball was shoved into a large tight donut hole. For reference, the tile is 12 in square. Both are very symmetrical. It appears to have rust color but no other indication this is an iron concretion. The outer "shell" to me looks like it cracked under pressure, but the center ball did not. Although curious to the possibility of having contents, I do not want to do a destructive investigation. Your input is very much appreciated. I share my finds and information with teachers and students. So, I want to be as accurate as possible. Thank you, Paleo Adventure
  2. dries85

    Concretion with Fossil inside

    I found this concretion with something inside, looks like half of a nodule with something bone alike. Found it while sifting for Miocene shark teeth in a clay quarry in the Antwerp region in Belgium. I think the gravel i'm sifting is Pleistocene with reworked Miocene as i've found pieces of Mammoth bark in it as well. This piece leaves me clueless tho.. The concretion measures 9cm x 5cm sorry about the poor quality pics, that's the best i can get out of my smartphone... Thx!
  3. I've always wondered what a crab concretion would look like when it was CT scanned and had the chance to do so recently thanks to the friendly people at Pacific Radiology here in New Zealand. The concretion contains a Tumidocarcinus giganteus crab from the Miocene of New Zealand. Here is the concretion I scanned, the legs were visible on the side so I knew a crab was inside: One of the slices of the crab after I loaded the DICOM images into 3D slicer. There were 203 slices. By segmenting the images, telling the program what is rock and what is not rock, you can create a 3D image for import into Blender or other 3D images to prepare it for 3D printing. The 3D mesh was made up of 770 142 triangles. After making it manifold (water-tight), I imported it into Cura to generate the GCODE for my 3D printer. It also adds supports to be able to print overhangs. Here is the 3D printed crab sitting outside the concretion. It is accurate in size. I also scanned a penguin concretion which is on my Sketchfab profile (https://sketchfab.com/3d-models/fossil-penguin-ct-scan-segmentation-take-2-dd9cb20684d4471dad2757ab8a53a548) Here is the video of the process: You can look at the 3D model on Sketchfab: https://sketchfab.com/3d-models/ct-scan-of-fossil-crab-inside-concretion-25f26cb23a6046419521ed2422d5741d
  4. orockular

    PNW Estuary Concretion

    Dug this out of estuary mud (fully buried about 8ft out from high tide line) in NW Washington. I’m a newbie, been scouring galleries trying to get some ideas, may just be a fascinating mix of rock but the dark stripe portions strike me as bone or shell. Weighs about 3-4lbs.
  5. FossilFamily_24

    Suspected Crab Concretion

    Hello. We are beginners, and have a large concretion (suspected crab). What is recommended for removing the excess rock to expose what’s inside it? We want to minimize damage to it. It sounds as if breaking and freeze/thaw aren’t ideal for opening it. I’ve been trying to learn, but still not certain and feel safest asking. Money is tight this week, but would like to get something to begin on it and upgrade in a couple weeks. Any suggestions? Thank you. (I was thinking a 290 dremel w/fossil bits and later an air tool…uncertain which is best. Actually, I see that is a UK model.)
  6. Ezio Bonsignore

    Not a fossil (?), but what then?

    I have kept this thing on a shelf for some 40+ years just because I found it intriguing, but now I'm (lately) getting curious to understand what it could possibly be. I know I have collected it, but I don't seem to remember where - the most likely possibility is the Liaoning region in China, with Pakistan's Baltoro Glacier as a second and rather remote option. I don't see how it could be a fossil, but than what? A concretion? I've seen (not collected, we followed very strict self-imposed rules) quite a few truly bizarre concretions in close to three decades of speleology, but nothing resembling this. Further, it does not feel like a typical concretion to the touch, and rather gives the feeling of pressed sand. Any idea?
  7. I recently collected some Muncie creek concretions from the Kansas City area. I had previously only found a few concretions, but this time I was fortunate enough to end up with about 10. Several had Conulariid sections preserved, which I was excited about. Back home, I cracked open the remaining concretions. One of them had a tiny little brachiopod, and I didn't think much of it. Later, looking at it under magnification, I was astounded when I found the remains of the preserved pedicle! This is where I am sad to say, that in my excitement, I forgot to take pictures of the fossil prior to me prepping around the shell to aid in id. Anyways, after prepping around the shell with a hand scribe, I was excited to find that it was also my first lingulate brach. Orbiculoidea capuliformis Sorry for making you read all of that, here are the photos: Scale is in cm. Here are several interesting articles/papers for anyone interested. https://www.diva-portal.org/smash/get/diva2:373816/FULLTEXT01.pdf https://www.researchgate.net/figure/a-b-The-brachiopod-L-chengjiangensis-represented-by-stout-pedicles-marked-by-numbers_fig1_24424671 Despite being small, there is a lot of potential with Muncie Creek shale concretions. I learned a lot about them, and their existence, here on TFF. @Missourian has found many astonishing finds, and I noticed that soft tissue preservation is prevalent in many of his best concretions. Hope y'all enjoyed this. Have a great day, and a great weekend -Jay
  8. sonarcop

    Dino Egg or Concretion?

    I have received conflicting responses from numerous geologists on my find. Even had one geologist remark that my find was a fake, which I can assure is not. Found in dry riverbed off mountain road in Portola Valley, California. Any advice or suggestions on identification is truly appreciated.
  9. Mike Vick

    Identification please

  10. I have had great luck finding fossils in creeks and wild places, but this afternoon was my first construction site success (other than Grayson nautiloids and a few shoe clams), and the first success I’ve had in northern Johnson county at a Mansfield construction site. I barely lifted this into my trunk and the car immediately lowered by a few inches. lol! I like creeks because erosion isn’t only visible for a few days until a big slab covers the entire ground, but it sure is easier to find ammonites by the curb..when they’re right there! If only I could have a cell phone alert for active tractors in the Tarrant Formation..
  11. Rockwood

    Mazon Creek

    This was found in the southern unit of the Mazonia Wildlife Management area in northern Illinois. Ma nature had already opened it, so it may be in kind of rough shape. Is there enough here to identify it ?
  12. Entoloma

    12kg Tumidocarcinus prep

    A few months ago, I came across this big crab concretion sticking out of the sand. It was my second largest of the day, but only by a mere 10kg! Still! 12kg aint too bad. Where I found it, was quite sandy, and another fossil hunter had been there before me, but fortunately he hugged the cliff face, there and back. I walked towards the ocean and spied some legs sticking out of the sand! I started this prep with my ZOIC chicago and rounded chisel tip. It removed 2kg of rock in two hours. Not the fastest, but it beats my old dremel by a long shot!
  13. Fullux

    Strange concretion.

    Howdy all, Found this in my usual spot in the Drakes formation. Looks like some sort of concretion, what do y'all think? Louisville, Kentucky.
  14. MsLine

    Septarian Nodule...I think

    Hello, first time here. I've been looking around trying to identify this fossil, and it seems that is a septarian nodule, or concretion, or both? I don't know much about fossils, so any information anyone could share would be much appreciated. It is about 2.5-3" across and about 1" thick. It's pretty heavy for its size. It looks like yellowish limestone, but harder, and the veins are gray. Found in Meridian, TX. Would it be worthwhile to have it polished, or just keep as an unusual object? It's pretty small. We do like it
  15. Hello! I was hoping someone could help with identifying this fossil. It was found at an abandoned rental property in Copperas Cove, Texas about 15 years ago. I do not know where it was originally found. I hope these pictures are adequate. Thanks for any help!
  16. Terrygross

    How to cut a large nodule?

    Please advise…which tools do I need to slice a septarian nodule the size of a basketball and dense, about 100lbs?
  17. 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
  18. 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
  19. 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!
  20. jamesKJ

    Herman mo

    Any guesses on what is trapped and sticking out of the concretion.
  21. 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!
  22. 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.
  23. 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?
  24. Rockwood

    Fern seed ?

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