BobWill Posted August 29 Share Posted August 29 This came from a bucket of material from Jacksboro Texas donated by @GaryTurner for the Dallas Paleontological Society fund-raising auction, so it's Late Pennsylvanian, Graham Formation. The surface resembles a bryozoan but I haven't seen one with this shape. Scale is millimeters. 1 Link to post Share on other sites
DPS Ammonite Posted August 29 Share Posted August 29 (edited) Could it be encrusting something with that general shape. If so what? BTW, I really like your needle scale; very easy to place in photo.EDIT: I see that it is a regular ruler that is cut off. I like my new idea of creating a scale on a needle. Edited August 29 by DPS Ammonite Link to post Share on other sites
Missourian Posted August 30 Share Posted August 30 Interesting Could it be an echinoderm ossicle, perhaps ophiuroid? 2 Link to post Share on other sites
DPS Ammonite Posted August 30 Share Posted August 30 (edited) 9 minutes ago, Missourian said: Interesting Could it be an echinoderm ossicle, perhaps ophiuroid? Yeah, like that. @BobWill Are there any incrusting sponges that look like that on the surface? Detailed photos? I am familiar with Incrustospongia meandrica. http://www.thefossilforum.com/topic/60707-encrusting-sponges/ Edited August 30 by DPS Ammonite 1 Link to post Share on other sites
BobWill Posted August 30 Author Share Posted August 30 1 hour ago, Missourian said: Interesting Could it be an echinoderm ossicle, perhaps ophiuroid? 1 hour ago, DPS Ammonite said: Yeah, like that. @BobWill Are there any incrusting sponges that look like that on the surface? Detailed photos? I am familiar with Incrustospongia meandrica. http://www.thefossilforum.com/topic/60707-encrusting-sponges/ I don't know of any Incrustospongia meandrica from the site but it's possible. I thought of a bryozoan encrusting a crinoid arm ossicle with a food grove but it didn't seem quite right. I thought someone might recognize the shape. The texture seems a little too open for echinoderm stereom structure. "I like my new idea of creating a scale on a needle." I missed seeing that. It sounds good. I'll look for the thread. Link to post Share on other sites
DPS Ammonite Posted August 30 Share Posted August 30 10 minutes ago, BobWill said: The texture seems a little too open for echinoderm stereom structure I think a bryozoan may have grown over a piece of echinoderm? Link to post Share on other sites
Al Dente Posted August 30 Share Posted August 30 I think it is a starfish terminal ossicle. 2 1 Link to post Share on other sites
Al Dente Posted August 30 Share Posted August 30 Here's a couple examples of starfish terminal ossicles (#7 and #9 in this illustration). 5 Link to post Share on other sites
Mahnmut Posted August 30 Share Posted August 30 2 hours ago, Al Dente said: I think it is a starfish terminal ossicle. If so, the texture would not be an encrustation, but part of the ossicle, right? A quick search turned up these: from here: https://onlinelibrary.wiley.com/doi/10.1111/joa.12881 Best Regards, J 1 1 Link to post Share on other sites
Al Dente Posted August 30 Share Posted August 30 2 minutes ago, Mahnmut said: If so, the texture would not be an encrustation, but part of the ossicle, right? Right. Link to post Share on other sites
Al Dente Posted August 30 Share Posted August 30 Here are a couple examples that I've picked out of the Castle Hayne Formation. These are surprisingly common. 4 Link to post Share on other sites
JamieLynn Posted August 30 Share Posted August 30 Great little find! Yes, agreeing with all above, starfish ossicle. I find them frequently in Cretaceous micro matrix, but none with quite that surface texture, but most do have an interesting surface pattern. 1 3 Link to post Share on other sites
BobWill Posted August 30 Author Share Posted August 30 Mystery solved! I had an idea that shape would get recognized by someone. The fauna list for this formation at Jacksboro just keeps getting longer! 1 2 Link to post Share on other sites
DPS Ammonite Posted August 30 Share Posted August 30 Is there a Texas institution that is interested in samples of every type of Jacksboro fossils? Can you add photos of this to the database on the DPS website of Jacksboro/Pennsylvanian fossils? I see that Rodney Wise has a few photos. Link to post Share on other sites
BobWill Posted August 30 Author Share Posted August 30 (edited) 4 hours ago, DPS Ammonite said: Is there a Texas institution that is interested in samples of every type of Jacksboro fossils? Can you add photos of this to the database on the DPS website of Jacksboro/Pennsylvanian fossils? I see that Rodney Wise has a few photos. Yeah, @rwise has a lot of them on his website too. https://www.txfossils.com/ (not a commercial site) Our TX/Penn Study Group still has that as a goal but we haven't been active in quite a while. Maybe some day. Edited August 30 by BobWill Link to post Share on other sites
Tidgy's Dad Posted August 30 Share Posted August 30 Failing that, I'm most certainly interested. Link to post Share on other sites
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