gturner333 Posted May 1, 2018 Share Posted May 1, 2018 I have found these small pacman-like segments at Jacksboro, TX (Lost Creek Reservoir), which is Pennsylvanian, and have always thought that they were a segment from a crinoid stem. I then found what looks like a stem with about 7-8 segments along with more of the individual segments. However, the segments never have any of the radial lines that I often seen in other crinoid segments. Any idea what these are? Thanks. Link to comment Share on other sites More sharing options...
Herb Posted May 1, 2018 Share Posted May 1, 2018 they look like crinoid pieces to me also "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 Link to comment Share on other sites More sharing options...
Bone guy Posted May 1, 2018 Share Posted May 1, 2018 Interesting. They look like mini cheese wheels! I would probably eat a few before I realized why they were so crunchy Link to comment Share on other sites More sharing options...
erose Posted May 1, 2018 Share Posted May 1, 2018 Yes, crinoid arm segments. Link to comment Share on other sites More sharing options...
gturner333 Posted May 1, 2018 Author Share Posted May 1, 2018 Well, i was close. Thanks Link to comment Share on other sites More sharing options...
BobWill Posted May 1, 2018 Share Posted May 1, 2018 1 hour ago, erose said: Yes, crinoid arm segments. Correct, and the missing wedge forms the food groove leading to the mouth. You can see from the one resting on it's edge that they taper slightly from one side to the other and the taper alternates so that one with a thicker left side sits on top of another with a thicker right side. This probably giver the arms greater strength than if they were the same thickness all the way across. Some arms use an interlocking system for greater strength. Link to comment Share on other sites More sharing options...
gturner333 Posted May 1, 2018 Author Share Posted May 1, 2018 Thanks Bob. Good info. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted May 1, 2018 Share Posted May 1, 2018 Very interesting crinoid bits! Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
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