rwise Posted January 28, 2015 Share Posted January 28, 2015 I found these items in Jacksboro, TX, Pennsylvanian, Graham formation, finis shale.....and I need help identifying.... The first looks like coprolite, but has crinoid features on the very end.....maybe worn byrozoan on crinoid???? 1. 2. See the Crinoid features? The second I have no clue. Looks like an oyster of some sort, but is not like others I have found in Texas. 3. 4. 5. Thanks in advance for your help. Thanks for your help in advance. Link to comment Share on other sites More sharing options...
fossilized6s Posted January 28, 2015 Share Posted January 28, 2015 Your first item appears more to be a Rugose coral or something similar. Crinoids will almost always have a center cavity running through the middle (like stacked Cheerios). That being said, im not 100% what it is. ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
BobWill Posted January 28, 2015 Share Posted January 28, 2015 I find just as many crinoid stems without the hole in the center as with. I think that's a stem with a bryozoan around it. The second one is from Mars Link to comment Share on other sites More sharing options...
fossilized6s Posted January 28, 2015 Share Posted January 28, 2015 Interesting. The lumen must be filled. I have always been under the impression that the lumen houses the Crinoid's nervous system (hence why it's an animal and not a plant). But im not an expert. http://www.ucmp.berkeley.edu/echinodermata/stem_lumen.html ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
BobWill Posted January 28, 2015 Share Posted January 28, 2015 That's correct but like most empty spaces they often fill in with water-borne minerals during fossilization. The individual disks are usually found with the inside eroded out but all of my longer stems are filled in with material that doesn't just wash out. Link to comment Share on other sites More sharing options...
erose Posted January 28, 2015 Share Posted January 28, 2015 What is the size of the first item? Link to comment Share on other sites More sharing options...
dragonsfly Posted January 28, 2015 Share Posted January 28, 2015 Couldn't 3,4,5, be a cast of crinoid arms/fronds ? I have many similar from IL. and that's what I thought they were, that or some sort of trace. John Link to comment Share on other sites More sharing options...
Missourian Posted January 28, 2015 Share Posted January 28, 2015 (edited) I vote 'crinoid stem' for the first one, though the anastomosing 'sutures' in the first image are odd. The second one reminds me of the trace fossil Zoophycos. A pelecypod shell fragment (myalinid?) is another possibility. Edited January 28, 2015 by Missourian Context is critical. Link to comment Share on other sites More sharing options...
rwise Posted January 29, 2015 Author Share Posted January 29, 2015 First picture the specimen is 1.5 inches long Thanks for your help in advance. Link to comment Share on other sites More sharing options...
erose Posted January 31, 2015 Share Posted January 31, 2015 The first one may be a section of crinoid stem with a "gall". In one photo there appears to be a round hole or boring visible. There were some worms or other critters that did this to crinoids, causing the crinoid to enlarge the stem in response. The stem also appears to be polymeric (more than one component for each layer of the disc) which would be different. The second piece may be an odd algal form. Link to comment Share on other sites More sharing options...
fossilized6s Posted January 31, 2015 Share Posted January 31, 2015 The first one may be a section of crinoid stem with a "gall". In one photo there appears to be a round hole or boring visible. There were some worms or other critters that did this to crinoids, causing the crinoid to enlarge the stem in response. Parasites often did this too. It's actually kind of cool looking. ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
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