parsonsian Posted February 17, 2015 Posted February 17, 2015 Found in a sandy wall, we thought these were crinoid stem segments. I took a small piece home and had a closer look. Now I have no idea what they could be. From the Jurassic Sundance formation of Northwest Wyoming. We find isocrinus crinoids, belemnites, gryphaea, clams, and other fossils I the same exposure. Thanks for your time.
parsonsian Posted February 17, 2015 Author Posted February 17, 2015 Most are about 1mm across the rectangle and 3-6mm long. No visible column pattern but they could be worn on the outside.
Ptychodus04 Posted February 17, 2015 Posted February 17, 2015 Mineral possibly? Regards, Kris Global Paleo Services, LLC https://globalpaleoservices.com http://instagram.com/globalpaleoservices http://instagram.com/kris.howe
jpc Posted February 17, 2015 Posted February 17, 2015 Probably sea urchin spines. They are also known from the Sundance.
Herb Posted February 17, 2015 Posted February 17, 2015 I agree with jpc.. "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks
Auspex Posted February 17, 2015 Posted February 17, 2015 graphularia? That's a good thought, but the site is (stated to be) Jurassic; form what I can find, graphularia hasn't been found older than Cretaceous? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease!
parsonsian Posted February 17, 2015 Author Posted February 17, 2015 Thanks everyone, I didn't even know where to start with these. Auspex, have you ever heard of ditrupa from the same formation and location? Found them too.
jpc Posted February 17, 2015 Posted February 17, 2015 I had to look up ditrupa... but yes, tusk shells are also known from the Sundance. The ones I have seen are pretty small.
abyssunder Posted January 1, 2016 Posted January 1, 2016 (edited) Some crinoids like Xenocrinus have quadrangular columnals with a central canal, but in transverse section they are squarish, not circular as seen in the specimen in question. In my opinion, at that dimension and overall shape,compared with the Jurassic Oxford Clay (England) material, I think could be annelid worm tubes like Genicularia vertebralis which were segmented worms with round canals in cross section. Also there are other worms with four-sided tubes,for example Nogrobs (N. quadrangularis, N. canteriata). Edited January 1, 2016 by abyssunder 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library
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