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Found 129 results

  1. Concretionary?

    From my previous trip to Ellsworth County, Kansas and it's located in Dakota formation, Cenomanian. It appeared as almost like vertebrae but I'm sure it's not verts. Is it by chance some form of ichnofossil? @jpc thinks it's concretionary. No disrespect to him, he's the only one who offered his opinion and I would like to know if anyone else have a different opinion.
  2. Yoshida, H., Ujihara, A., Minami, M., Asahara, Y., Katsuta, N., Yamamoto, K., Sirono, S.I., Maruyama, I., Nishimoto, S. and Metcalfe, R., 2015. Early post- mortem formation of carbonate concretions around tusk-shells over week-month timescales. Scientific reports, 5, no. 14123. Open access Nagoya University PDF link Researchgate PDF link More papers by Ippei Maruyama More papers by Hidekazu Yoshida Related papers are: Yoshida, H., Yamamoto, K., Minami, M., Katsuta, N., Sin-ichi, S. and Metcalfe, R., 2018. Generalized conditions of spherical carbonate concretion formation around decaying organic matter in early diagenesis. Scientific reports, 8(1), pp.1-10. Open access Another PDF link for paper Researchgate PDF link More papers by Hidekazu Yoshida Yoshida, H., Asahara, Y., Yamamoto, K., Katsuta, N., Minami, M. and Metcalfe, R., 2019. 87 Sr/86 Sr age determination by rapidly formed spherical carbonate concretions. Scientific reports, 9(1), pp.1-7. Open access Researchgate PDF link Publisher Correction More papers by Hidekazu Yoshida Yours, Paul H.
  3. Hello. I was just curious about what some good techniques for artificially weathering a concretion to get them open are? I've read that the best way to go is to soak, freeze, thaw, and repeat. But none of the sources I've read describes how long that takes. I'm sure it varies from specimen to specimen but is this process weeks, months or years? Does anyone have any other methods or resources about the process? I was thinking of giving it a try and could use some more information on the process. It seems kind of like the old geode gamble in a way. There's no way of knowing what's inside unless it's partially exposed already. I don't have a geologist's hammer and I think I'd feel bad if I cracked one by hitting it too hard or at the wrong angle. Are there any other tools that are recommended?
  4. Concretions or Eggs

    Hi All, I'm new to the forum and I have no paleontology experience other than a class from undergrad 20 something years ago. My background is structural geology, hence my post here in hopes that I may confirm my suspicion as to the genesis of the specimens in the attached pictures. First a little background: I was in the field yesterday doing some reconnaissance work in east-central Wyoming. The land owners whose property I was on are multi-generational ranchers and they were extremely welcoming and enthusiastic about the geology of the area, despite having limited knowledge. At the end of the day, standing in their yard saying thank you's and goodbye's one of the college-age sons came running up with 2 specimens of what I presume to be concretions. However, the texture was smoother than other concretions I have seen and there was a dimpled character to the extremity of both which I found odd. The kicker is that the southern end of their property has a full section of Jurassic Morrison Fm exposed. When I asked what the rock looked like in the area that he found them, his description matched what could be interpreted as the variegated sands and shales of the Morrison Fm. Of course, it could also describer some of the Miocene sediments unconformably overlying the Cloverly Fm in the area as well. Regarding the photographs attached: I did not take the specimens with me, only the photos attached with my phone in the land owner's front yard. Therefore I do not have scale other than to say the index finger of my left hand is 9.5 cm and my left thumb is 7 cm from tip to base knuckle. Any help would be greatly appreciated as I told the landowner's son I'd be happy to do a little research on his behalf. Much thanks in advance! -WyoOtto
  5. Anyone out there have any Tully Monsters they would be willing to trade. Partials ok. PM if you want.
  6. Good afternoon folks. I am wondering if anyone in our group has a "collection" of mislabeled concretions. If so, post them here it may help others identify some of their unknowns.
  7. CYLINDRICHNUS CONCENTRICUS TOOTS IN HOWARD, 1966(TRACE FOS SIL) IN ITS TYPE LOCALITY, UPPER CRETACEOUS, WYOMING Allan A. EKDALE & Sherie C. HARDING Annales Societatis Geologorum Poloniae (2015), vol. 85: 427–432. doi: http://dx.doi.org/10.14241/asgp.2015.018 asgpichnolspecissueekdalefestschri85_3_507_514 (2).pdf
  8. Mazon concretion IDs...

    Hey guys, I braved the creek yesterday on the first day of hunting season at Mazon. It was a thrilling first time getting to hunt there. These of the surface finds were pretty interesting looking and were among many duds, so I'm wondering if anyone has any ideas as to their classifications. The rest of the lot is in the freezer so look for my thread on that in a bit More concretions in the following posts: Thanks for looking!
  9. Colorado Fossils Show How Mammals Raced to Fill Dinosaurs’ Void An unusually rich trove found in Colorado reveals the world in which our mammalian forebears evolved into larger creatures. https://www.nytimes.com/2019/10/24/science/fossils-mammals-dinosaurs-colorado.html Fossil trove shows life's fast recovery after big extinction by Malcolm Ritter, PhysOrg. October 24, 2019 https://phys.org/news/2019-10-fossil-trove-life-fast-recovery.html Yours, Paul H.
  10. Crab 3.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    This is the only crab I have in the collection however small it may be
  11. Crab 2.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    This is the only crab I have in the collection however small it may be
  12. Crab 1.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    This is the only crab I have in the collection however small it may be
  13. Single Shell no Matrix 10.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  14. Single Shell no Matrix 9.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  15. Single Shell no Matrix 8.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  16. Single Shell no Matrix 7.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  17. Single Shell no Matrix 6.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  18. Single Shell no Matrix 5.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  19. Single Shell no Matrix 4.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  20. Single Shell no Matrix 3.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  21. Single Shell no Matrix 2.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  22. Single Shell no Matrix 1.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    These are the single shell, no matrix specimens. pic 1-4, I believe is the sand sediment taken from the location of these "Ocean Album" fossils. It was laying with the bone section of the collection, however none of the other bone in the collection have this appearance.
  23. From the album 1925 Body & Trace Fossil Collection - Ocean

    I combined the closeups to get a few more of the shells in the album
  24. Tiny Ammonites and Worms 15.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    Once you start looking at this specimen the tiny ammonites just keep appearing. Worm holes have not been vacated.
  25. Tiny Ammonites and Worms 14.JPG

    From the album 1925 Body & Trace Fossil Collection - Ocean

    Once you start looking at this specimen the tiny ammonites just keep appearing. Worm holes have not been vacated.
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