BobWill Posted January 23, 2023 Share Posted January 23, 2023 This came from the Brad Formation, Palo Pinto County of Texas. It's in the Missouri Series of the Late Pennsylvanian. There seems to be crinulations like you see on crinoid stems but there are nubs poking out in a completely random way in every direction. Some of the surface looks a little like calyx plates but there is no obvious symmetry. It could be part of a holdfast since I am not familiar with them but I have no idea for certain. The scale in millimeters. Link to comment Share on other sites More sharing options...
Rockwood Posted January 23, 2023 Share Posted January 23, 2023 I don't have much experience with them either, but it sure seems to fit the description of a holdfast. With perhaps a dab of bryozoan for good measure. Link to comment Share on other sites More sharing options...
westcoast Posted January 23, 2023 Share Posted January 23, 2023 Interesting piece, i can also see both calyx and holdfast options, i just wonder if there might be few pieces cemented together into a little cluster. Link to comment Share on other sites More sharing options...
Rockwood Posted January 23, 2023 Share Posted January 23, 2023 1 hour ago, westcoast said: cemented together into a little cluster. The texture of the would be cement is different from that of the pore containing material. (bryozoan?). I suppose it could be another cementing agent though. Link to comment Share on other sites More sharing options...
minnbuckeye Posted January 23, 2023 Share Posted January 23, 2023 (edited) I am currently working on an ID for a holdfast that I initially thought a calyx and came across this illustration. http://www.uky.edu/KGS/fossils/fossil-of-the-month_2022-12_crinoid-holdfasts_files/4 Barycrinus holdfast.jpg Edited January 23, 2023 by minnbuckeye 2 Link to comment Share on other sites More sharing options...
JimB88 Posted January 23, 2023 Share Posted January 23, 2023 not a calyx; definitely a hold fast Link to comment Share on other sites More sharing options...
minnbuckeye Posted January 23, 2023 Share Posted January 23, 2023 Blackwell Publishing Ltd The root of the problem: palaeoecology of distinctive crinoid attachment structures from the Silurian (Wenlock) of Gotland has an image that is remarkably similar to yours! Link to comment Share on other sites More sharing options...
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