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  2. Sea Biscuit

    Regularity_in_irregular_echinoids.pdf J. Math. Biol. 44, 330–340 (2002) Mathematical Biology M. Torres , J.L. Aragon, · P. Dominguez , D. Gil Regularity in irregular echinoids @Coco some of you may like: Saucedeetal2007Irregularia.pdf Geol. Mag. 144 (2), 2007, pp. 333–359. Phylogeny and origin of Jurassic irregular echinoids(Echinodermata: Echinoidea) THOMAS SAUCedE , RICH MOOI & BRUNO DAVID
  3. Sea Biscuit

    Thank you for the information. I now know some echinoderm vocabulary. I'll keep that in mind. Thanks!
  4. Sea Biscuit

    Hi, I can't help you, but holes are : - "peristome" (in french but could be the same in english) -> mouth, - "periproct" -> anus. On "regular" sea urchins they are placed in a perfectly vertical axis (periprocte at the centre above and peristome at the middle below). On "irregular" sea urchins the peristoma is always below the center and the periprocte may be on top or on the underside, near the peristoma or not depending on the species. Yours is an irregular sea urchin. Coco
  5. Sea Biscuit

    images from: Porter M. Kier Revision of the cassiduloid echinoids SMithsonian Miscellaneous collections,144/3 NOTE: taxonomy MAY be outdated
  6. Quartz Snail (Gastropod) Fossil?

    I did as you asked. I didn't see any real scratch on the crystal surface after attempting to scratch it with my knife (440 stainless). Vinegar acted as water did. No fizzing at all.
  7. Some different Dino displays

    That is absolutely true lol I’m surprised every time I stop to think about the fossils we have. The Hell Creek collection surprises me. We’ve done well but we had a lot of help too. Please do do keep an eye out. I would love to knock that one out.
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  9. Quartz Snail (Gastropod) Fossil?

    I might suggest that you first do some simple tests to determine whether this is quartz or possibly calcite crystalization. First take a pocket knife and see if it will scratch the crystal surface. Second, place a couple of drops of vinegar on the area that you tried to scratch. Does the vinegar fizz? Finally, wash off the vinegar, rinse well in flowing faucet water, dry the specimen off and report what you saw.
  10. Quartz Snail (Gastropod) Fossil?

  11. Quartz Snail (Gastropod) Fossil?

    It's been a while since I have been on here. Life got in the way of me looking for rocks and fossils. The property that I have access to hunt in has several seasonal creeks on it. This was found in a dry creek bed. I didn't think a lot about it as these type of "snail" fossils are the main thing that I find. When looking at it closer at home, I realized that the fossil itself seems to be replaced with quartz? The surface has been worn down by weathering and by the creek flow during the spring. I am not sure that the images convey the crystal properly, but the clear, crystal structure is there. Is this a common thing in fossils? It is the first that I have found. It was found outside of Willow Springs, Howell County, Missouri, USA and measures 21mm. There is a second "snail" still encased in the rock. The part that is visible is also quartz.
  12. Sea Biscuit

    As well as, I don't know echinoderm vocabulary, the "holes" don't line up the same as Clypeaster. I noticed that in Clypeaster specimens, the "holes" seem to make an elongated U shape. While in Claviaster, they seem to come to a sharp V shape. Mine also comes to a sharp V shape.
  13. Descent into the Pit - Savannah, GA

    Thanks Tim ... Thanks guys ! ... yeah, next time I will be better prepared for the small stuff. I had the 1/4" sifter up in the car but I'd need to haul down a nice bucket and maybe some window screen to see if I couldn't collect and wash it on-site. Cheers, Brett
  14. Sea Biscuit

    I just looked at Clypeaster and compared mine with a variety of species. My specimen doesn't seem to have the "puffy" ness like other Clypeaster specimens do have. I looked at Claviaster, they do look extremely similar.
  15. Some different Dino displays

    One thing I’ve learned is never say never you may be surprised how much your collection will grow in a few years. Even after one year, you’ve managed to knock off almost the entirety of the Hell Creek Formation. A dromaeosaur from the Aguja Formation is definetly obtainable, can keep an eye out for you. Although fauna assemblage should be comparable to Judith River Formation so most likely Saurorniothelestes as well.
  16. Sea Biscuit

    The matrix reminds me of Moroccan material.
  17. Sea Biscuit

    Compare with Claviaster as well.
  18. Descent into the Pit - Savannah, GA

    Great report, Brett! Thanks for all of the great site photos. That site looks like more fun than a barrel of monkeys! If you ever get some of that micro-matrix, sign me up for a trade.
  19. Sea Biscuit

    Clypeaster sp. Providence and age would help in species ID, if available.
  20. 2 teeth...acheroraptor ? & tyrannosaur or dromaeosaur ?

    This next tooth was sold to me as a tyrannosaur or dromaeosaur tooth from the Two Medicine Formation, its still in the matrix , its CH is 20 mm, 11 serrations per 4 mm on the posterior of the tooth, 10 per 4 mm on the anterior....
  21. Dinosaur book for identifying fossils

    Aa a type example of a nice ("TECHNICAL!!!!")sauropod teeth paper: New lower jaw and teeth referred to Maxakalisaurus topai (Titanosauria: Aeolosaurini) and their implications for the phylogeny of titanosaurid sauropods Marco A.G. França1, Júlio C. de A. Marsola, Douglas Riff, Annie S. Hsiou, Max C. Langer PeerJ 4:e2054 https://doi.org/10.7717/peerj.2054
  22. Sea Biscuit

    I bought this at a fossil and rock show at my local state fair, I did not get any identification on it besides "Sea Biscuit". Can anyone help me?
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