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Found 5 results

  1. Echinoid Coenholectypus Austin.JPG

    From the album Central Texas Fossils

    Echinoid Coenholectypus Sea Urchin Found in Travis County
  2. Big Echinoid

    It was a beautiful day here in Austin and I decided to get a few quick hours in on some local Walnut Formation exposures. Lower Cretaceous. I think I found the largest Coenholectypus planatus I’ve ever seen. It is slightly crushed but would be a full 5 centimeters in diameter. My largest prior specimen was maybe 4cm. Tell/show me your largest of this species.
  3. I have a couple of Coenholectypus from the Glen Rose which have the morphological characteristics of Coenholectypus nanus as described by Cooke, 1955. Some Cretaceous echinoids from the Americas. Geological Survey Professional Paper 264-E, page 96. In an aboral view, the periproct is clearly observed as a notch on the side of the test. It winds around the ambitus and terminates about three fourths of the way to the peristome. It is not Coenholectypus planatus. This is one of the specimens I wish to include in my book on Texas Cretadeous echinoids. However, I am just a little hesitant to classify it as Coenholectypus nanus as Cooke emphasizes that the examples from the Pawpaw rarely exceed 10 mm in diameter. This is remarkably close in size to a morphologically very similar species that Dan Woehr finds in the Boquillas. The ones I have are around 21.5 mm in diameter. Has anyone found examples in the Glen Rose that are similar in size to the ones that I have, or does anyone have a good idea as to what my examples may be if they are not C. nanus?
  4. From the album Kcw Site 2, Callahan Co., Tx

    Same fossil assemblage from SE Callahan County showing Oral surfaces.
  5. From the album Kcw Site 2, Callahan Co., Tx

    An assemblage of fossils found in Lower Cretaceous, Comanche/Walnut Formation at a site in SE Callahan Co., Tx. Phymosoma texana, Coenholectypus planetus?., Tetragramma sp. (all showing Aboral surfaces), Tylostoma sp.
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