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  1. Hello again forum! Remember that bucket “goodie bag” I took home from the torn up Post Oak Creek a few months ago? I finally went through it and found some excellent stuff! (Im actually wow’d with some of this stuff because I’m just an amateur!) Surprisingly- I found tons of other stuff that ARENT shark teeth for once! I grabbed a 5 quart bucket and took a big shovel scoop of gravel/mud from various parts of the entrance of the creek where the construction was and some from the first sandbar. Im working on an educational frame display I might actually eventually donate (there IS a massive park being built there for tourism !) and wanted to label found bones correctly. You’d think because I come here SO often I’d be an expert at the finds here but I’m not a real paleontologist or biologist, just an outdoorsy lass who can find fossils and loves learning about ancient animals. I tried my best to ID some of these finds myself, however I just found myself stuck and not very confident with IDing these bones. Because there’s so many mammal remains found here as well I wanted to ask you guys for help- and give me pointers how to ID cretaceous reptile bone, fish bone, and mammal bones. (Teach this woman to fish metaphorically. ) Unfortunately my bone finds are worn and some are tumbled fragments which make it harder for a novice like me. Any help appreciated, and happy to learn! Post Oak Creek is in Sherman, Texas. Cretaceous, Eagle Ford and theres also “Ice Age” fossils and even more recent fossils found here too. Everything here I can confirm is fossilized and very much stone. I also added in 3 bones from last trip than need ID’d plus a few other cool things. ***I took a TON of pictures and have to load them on seperate posts-please be patient! I will add captions to them all as well so wait until I post “Done!” Sorry for super dry hands. The process! The Finds: all spread out! Ruler is in MM (milimeters). I labeled them by letters and there’s some bonus things in there to ID! These are the bones Im most curious about! (More photos below) These are more recent fossils, I feel confident at least that G, I, & J are turtle shells. No idea about H or K but might also be turtle? M & L look and feel lighter but are still very much stone- maybe mammals. Someone already helped me ID that N and O are fragments of mammoth teeth but what the heck is P!? Could it be a pig tooth or even…human!? * Bonus Round! * ?1 I think is the tiniest ptychodus tooth ever! I have no idea of the species however it’s probably one of the tony teeth in the outtermost bottom part of the jaw (the teenie long ones!) ?2 I think is some sort of spine? It almost reminds me of a belemnite or sea urchin spine. Its definitely organic and not man-made. ?3 I THINK I FOUND A NATIVE AMERICAN CLAY BEAD! I find a few of these every once in a while there, usually small. Are these little Cretaceous sponges?
  2. DPS Ammonite

    Ostrea alifera var. pediformis Craigin

    This is a Cretaceous oyster that I found in Post Oak Creek in Sherman, Texas. The oyster has traces of a yellowish calcite-cemented sandstone found in the upper part of the Arcadia Park Formation of the Eagle Ford Group. "Pediformis" in the name, Ostrea alifera var. pediformis, means foot-shaped or pediform because the oyster looks like a foot or boot. In Hill 1898, the author eliminated the Ostrea alifera Cragin, and Ostrea alifera var. pediformis Cragin names because he considered them to be Ostrea lugubris Conrad. I disagree with Hill's decision because my oyster is larger than most O. lugubris (now Cameleolopha lugubris) and lacks an attachment scar characteristic of O. lugubris. My oyster may be a genus Cameleolopha since both Cameleolopha bellaplicata and Cameleolopha lugubris occur nearby. Unless new information can be found, my oyster should be called: Ostrea alifera variety pediformis Craigin. For more information and drawings of Ostrea alifera and Ostrea alifera variety pediformis Craigin see: Cragin, F. W. 1893. "A Contribution to the Invertebrate Paleontology of the Texas Cretaceous", Austin, Texas, B.C. Jones & Co., State printers. Hill, Robert T. & T. W. Vaughan. 1898. The Lower Cretaceous *Grypheas* of the Texas region. U. S. Geological Survey, Bulletin 151: 139 pp.
  3. As usual, we found the usual shark teeth in Post Oak Creek in Grayson County, but I’m unsure about this tooth. I’m very new at this, but it doesn’t have a flat backside like the typical shark tooth that we find, but it is almost a perfect oval shape. Any help is greatly appreciated. Have a great day!
  4. ThePhysicist

    Chiloscyllium greeni

    From the album: Post Oak Creek

    Small "bamboo" shark teeth, about 1 mm tall.
  5. ThePhysicist

    Ptychotrygon slaughteri

    From the album: Post Oak Creek

    Tiny sawskate oral teeth - less than 1 mm in size.
  6. ThePhysicist

    Post Oak foraminifera

    From the album: Post Oak Creek

    The shell of a "foram" (test). It looks like a snail or ammonite, but is actually a marine protist (only found in the oceans).
  7. ThePhysicist

    Chiloscyllium greeni

    From the album: Post Oak Creek

    A small "bamboo" shark, just 1 mm tall.
  8. ThePhysicist

    Post Oak denticles

    From the album: Post Oak Creek

    Various denticles from sharks and rays sitting on the face of a dime.
  9. ThePhysicist

    Rhinobatos

    From the album: Post Oak Creek

    Rhinobatos teeth are so small they make me angry Here you see a dozen guitar fish teeth sitting on the face of a dime! The largest is a bit under 1 mm tall. R. incertus has a pointed crown, R. caseiri has no point.
  10. ThePhysicist

    Septarian nodule

    From the album: Post Oak Creek

    This is a septarian concretion from POC. It's about the size of a good strawberry. Collected 9/28/19.
  11. ThePhysicist

    Scapanorhynchus raphiodon

    From the album: Post Oak Creek

    I'm pretty sure these are S. raphiodon teeth. They are much smaller than S. texanus with a narrow main cusp and finer striations than S. texanus. Compare: http://oceansofkansas.com/sharks/Kansas/shscap3.jpg
  12. ThePhysicist

    My smallest Cretodus

    From the album: Post Oak Creek

    I'm fairly certain this is a posterior Cretodus - a shark known for producing Texas-sized teeth! At just 1 mm tall, this may be the smallest Cretodus tooth possible.
  13. ThePhysicist

    Ginsu shark tooth

    From the album: Post Oak Creek

    The famous "ginsu shark" is a rarer species that can be found here. This is a lateral position; a tooth farther back in the mouth. I've only found a handful and none are complete.
  14. ThePhysicist

    Goblin symphyseals

    From the album: Post Oak Creek

    Symphyseal teeth are found in the midline of the shark's jaw. They are usually small and squashed-looking. Since only a few rows produce these teeth, they are much rarer than other positions.
  15. ThePhysicist

    Varied preservation

    From the album: Post Oak Creek

    The fossils in the creek can have varying levels of preservation: from the pristine glassy enamel seen at the top, to more river-worn seen below.
  16. ThePhysicist

    Cameleolopha bellaplicata

    From the album: Post Oak Creek

    These oysters are common in the creek, and support the Turonian age of the fossils.
  17. ThePhysicist

    Cameleolopha bellaplicata

    From the album: Post Oak Creek

    These oysters are common in the creek, and support the Turonian age of the fossils.
  18. Sherman turning Post Oak Creek into fossil park By Lauren Rangel, KXII Channel 22, July 8, 2022 Yours, Paul H.
  19. Caaaleb

    ID Needed: More POC Finds

    Hello! I have yet again grouped up some more fossils that I found in Post Oak Creek that I found interesting and would like to be ID'd. Thank you for the help! (1) very nice tooth (2) shark or other fish? (3) one if my biggest teeth (4) I think this is a Fossil? I was thinking enamel or ray but I'm not sure (5) I'm pretty sure this is a Fossil, but I could not get any good pictures of it up close unfortunately (I could try to get better ones later)
  20. Caaaleb

    Sherman teeth ID

    Hello! I went out to Post Oak Creek in Sherman, Texas, this April and I found my first batch of shark teeth ever, about 46 teeth! I got some pictures of the six main ones I found interesting and that I would like y'all to ID for me. Thanks! (1/2) (3) cutie (4) Shark or Mosasaur? (5) These three goobers (6) Biggest boy I've ever found!
  21. ThePhysicist

    Ptychodus whipplei

    From the album: Sharks

    An odd shark from the Cretaceous of North Texas - these sharks had crushing teeth suited for hard-bodied prey.
  22. ThePhysicist

    Cretodus tooth

    From the album: Post Oak Creek

    The "big guy" to find at POC. Though, this one is smaller, the preservation is as good as it gets for this location. In fact, it makes me believe that POC could draw from layers adjacent to the Eagle Ford Group. I've found matrix pieces that are consistent with the geology of EFG, but need to find matrix pieces with this kind of preservation to confirm Atco or something else. I'm also not sure that this is C. crassidens anymore since this smaller, narrower form differs so much from the holotype. I currently believe it's an undescribed species since I haven't found something that matches. Please let me know if you find a paper that fits this tooth (and the others at POC).
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