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Post Oak Creek Cretaceous Fossils

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Post Oak Creek Cretaceous Fossils

 These are my finds from a nice sample of sandy micro matrix from the Post Oak Creek in Sherman, TX.

 

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.

I have included a few of the more interesting bones some of which are probably of Pleistocene origin.

Any corrections are welcomed.

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36 images

2 Album Comments

ThePhysicist

ThePhysicist

Posted

Very nice images, glad you managed to find some cool stuff!

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old bones

old bones

Posted

Thanks so much, @ThePhysicist. I very much enjoyed the opportunity to search this rich matrix!

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  • Image Comments

    • Teeth during acid preparation

      By izak_ · Posted

      Indeed! This matrix is incredibly rich. I just use acetic acid for this material. 
    • Unidentified

      By izak_ · Posted

      Thank you! Photos are taken with the Laowa 25mm 2.5x - 5x lens on a Nikon Z7. The images are all focus stacked for depth of field. I use diffused light sources for contrast, but also most of these photos are taken of teeth submerged in water which reduces glare. I don't like this method for all specimens but it seems to work well on larger objects. 
    • Unidentified

      By LSG Lab · Posted

      Very interesting, this one and the next. How was such resolution and contrast achieved? Did you take photographs through a microscope?
    • Teeth during acid preparation

      By LSG Lab · Posted

      So many? This is a very rich layer! I have etched some blocks from France to get some teeth, but there is much less and it`s all submillimetric, and roots are almost always missing. What acid and procedure do you use by the way?
    • 'Chertized' Neospirifer cameratus

      By Jaybot · Posted

      Thank you Brian!
    • 'Chertized' Neospirifer cameratus

      By Brian James Maguire · Posted

      Really nice
    • Delocrinus cf. vulgatus, Strawn Group Undivided

      By Mochaccino · Posted

      This is a very nice specimen.
    • Texas sharks

      By Jaybot · Posted

      That is a beautiful Squalicorax tooth, thanks for sharing.
    • Unidentified

      By izak_ · Posted

      Thank you very much, I appreciate it! A copy of the full paper would be great  
    • Unidentified

      By ThePhysicist · Posted

      Very nice tooth and photography! I agree with juvenile cardabiodontid, looks fairly convincing.

      http://oceansofkansas.com/sharks/Kansas/Cardabiodon/FairportCard02.jpg
       
      Looks like it compares specific tooth positions. Also keep in mind this may not account for ontogeny. (lmk if you'd like the full paper.)
       
      "Dental differences between Dwardius and Cardabiodon gen. nov. include: (1) the anterior teeth are markedly enlarged relative to the anteriorly situated lateroposterior teeth in Dwardius (see Woodward 1894, pi. 6, fig. 2), but not in Cardabiodon (Fig. 5); (2) the second to fourth upper anterior teeth have a markedly distally directed cusp in Cardabiodon. In Dwardius, anterior teeth appear to have a more or less straight cusp (see Woodward 1894, pi. 5, fig. 25a?, d, e, n?; pi. 6, fig. 2b?, d, f); (3) the teeth of the lateroposterior files in both the upper and lower jaws have a more distally directed cusp in Cardabiodon than in Dwardius; (4) distally situated lateroposterior teeth are more compressed labiolingually in Cardabiodon than they are in Dwardius, which has unusually stocky commissural teeth."
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