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  1. Hello, everyone! Below are a few finds from the North Sulphur River and Post Oak Creek, and I’d love to get some help with identification. The ruler is in centimeters. 1. This first picture includes two mammal teeth (top two)(fossilized or no?), ???, and a small bone that appears to be fossilized. these were found at Post Oak Creek. 2. This bone was found at the North Sulphur River. 3. Nautilus found at NSR. Could anyone help with identifying the species? 4. Jaw fragment? Found at NSR. 5. Coprolite? It appears to have fragments of bone(?) in it. Found at NSR. 6. I found this tooth at NSR a while back, but someone recently IDed it as Latoplatecarpus (mosasaur). I can’t find too much literature on Latoplatecarpus; could anyone give me more information on this tooth and the animal it comes from? Thank you!
  2. These are my finds from a nice sample of sandy micro matrix from the Post Oak Creek in Sherman, TX. As others have attested, there are many fossils of sawfish to be found at the micro level. I very much enjoyed picking these as I find them as aesthetically pleasing as the denticles that I love to collect. The scale throughout is one millimeter. The stream wear made the ID of the oral teeth a bit difficult at times, so I lumped Ptychotrygon and Texatrygon sp. together. It was a real treat to find these Sawfish Rostral spines which I believe are those of Ischyrhiza texana. I found lots of interesting denticles. The Cantioscyllium decipiens and Chiloscyllium greeni teeth were distinctive enough for me to ID, but the ‘regular’ shark teeth were a bit too worn for me to be sure. Any help there is much appreciated. I think I found at least one Hybodus sp. tooth. (Cretalamna appendiculata ?) The fish material included the ubiquitous Enchodus sp. teeth and palatine bones, many fish coprolites, and lots of otherwise unidentified teeth. I photographed a few the more interesting bones some of which are probably of Pleistocene origin. continued...
  3. Hello, Looking for help with these Upper Cretaceous shark teeth from Post Oak Creek, Sherman, Grayson Co., TX, USA (Warning: Some of these are heavily eroded). Thank you! Squalicorax? Species? Cretodus or Cretalamna? Mix of both? Scapanorhynchus sp? @ThePhysicist
  4. Thanks in advance for your help! Post Oak Creek, Sherman, Texas. Turtle scute or part of vertebra?
  5. Thanks for your help in advance. Post Oak Creek, Sherman, Texas Crustacean?
  6. Hello all! I did a little sifting for shark teeth today in Post Oak Creek (Sherman Texas) and ran across a piece of fossilized bone I need help identifying… I’m guessing is an arm or leg bone from a small mammal (raccoon, rabbit, squirrel, etc.) but I would love to hear from the brain trust on what this may be. I also added a pic of the larger teeth I picked up today. thanks and have a great one! FreeRangeTraveler
  7. old bones

    Post Oak Creek micros for ID

    Exploring a nice sample of Post Oak Creek micro matrix was a new fossil adventure for me. Each new matrix comes with an additional learning curve, and I have managed to identify most of the finds in this one with the help of the excellent collections of fellow TFF members: @ThePhysicist, @JamieLynn, @EPIKLULSXDDDDD, @Jared C, and the informed opinions of @Al Dente and @MarcoSr to name a few. I am also an avid collector of PDFs regarding each new matrix that I explore. I could use some help with these 4 finds. The scale is 1mm in every image. I am having trouble deciding if they are Onchopristis dunklei or Ischyrhiza mira, or something else altogether… Thanks for looking
  8. My son found these today 4/10/23 at Post Oak Creek - Just curious if anyone can help us identify them. Thanks!!
  9. I found this tiny tooth while searching through some matrix collected from Post Oak Creek in Sherman, Texas. I believe the formation there is the Eagle Ford Group, Cretaceous. For scale, the grid in the pictures is 5x5mm, the tooth measures just under 3mm. I've been looking into Palaeogaleus and Galeorhinus, but neither seem to fit (I don't see any bulge with a crown that overhangs the root). Are either of these even known from this formation? Any thoughts on the ID of this tooth are appreciated, thanks!
  10. ThePhysicist

    Ptychodus atcoensis

    From the album: Post Oak Creek

    P. atcoensis was a rare species of durophagous shark that lived during the Late Cretaceous. Its contemporary P. whipplei was far more abundant and tended to have a higher, bullet-shaped crown; this disparity in morpholgy suggests they may have preyed on different things. From Shawn Hamm's thesis: "Diagnosis. Tooth Crown high and rounded, oriented 90° to the margin area in the medial files; crown crossed by six to eight thick, chevron-shaped parallel ridges; lateral files have moderately high crowns with four to five parallel ridges; posterior teeth are low crowned with two to three ridges; differs from other species as the ridges are thick, chevron shaped and terminate sharply at a coarsely granular and concentric margin."
  11. ThePhysicist

    Ptychodus atcoensis

    From the album: Post Oak Creek

    P. atcoensis was a rare species of durophagous shark that lived during the Late Cretaceous. Its contemporary P. whipplei was far more abundant and tended to have a higher, bullet-shaped crown; this disparity in morpholgy suggests they may have preyed on different things. From Shawn Hamm's thesis: "Diagnosis. Tooth Crown high and rounded, oriented 90° to the margin area in the medial files; crown crossed by six to eight thick, chevron-shaped parallel ridges; lateral files have moderately high crowns with four to five parallel ridges; posterior teeth are low crowned with two to three ridges; differs from other species as the ridges are thick, chevron shaped and terminate sharply at a coarsely granular and concentric margin."
  12. ThePhysicist

    Coniasaurus crassidens

    From the album: Post Oak Creek

    When I initially found this I was hoping it was Mosasaurid, however upon some reading, I decided it's more likely to be a sister group squamate. In particular, the labial sulcus convinced me it is probably C. crassidens (see Caldwell 1999). It is however much larger than any Coniasaurus teeth I've seen published.
  13. ThePhysicist

    Coniasaurus crassidens tooth

    From the album: Squamates

    When I initially found this I was hoping it was Mosasaurid, however upon some reading, I decided it's more likely to be a sister group squamate. In particular, the labial sulcus convinced me it is probably C. crassidens (see Caldwell 1999). It is however much larger than any Coniasaurus teeth I've seen published.
  14. Chelsie

    Shark Teeth from Post Oak Creek

    I’d like for my Post Oak Creek collection identified (specifically the shark teeth), but I can’t find much information online about the species of shark whose teeth are found here (Post Oak Creek in Sherman, Texas). When I HAVE come across general information about the creek and other peoples findings online, there aren’t any pictures of the teeth or nobody else knows exactly what they have. It’s also hard to tell if I’m grouping them correctly, so I apologize if I’m mixing some species together. The longer teeth have very similar characteristics, but greatly differ in size. And the only teeth that I HAVE been able to identify are the ptychodus teeth (not pictured), but only because they’re so unusual in appearance. Excuse the quality of the images. I don’t feel like setting up my camera right now, but I do plan on taking clearer images once I’ve correctly identified each specimen.
  15. I’ve decided to post this one separately. Very unusual composition. If you watch the video, you’ll see that light refracts off of tiny crystals in the center of each segment (which I’ve circled in red in another image). It’s hardly noticeable. The specimen is very smooth and rounded. Another member said in a different post of mine that it could possibly be an inoceramid hinge, though my own research resulted in nothing. I can’t find anything online that remotely resembles my specimen (inoceramid or otherwise). I found it at Post Oak Creek in Sherman, Texas. FullSizeRender.MOV
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