Missourian Posted December 1, 2011 Share Posted December 1, 2011 Here's a thoroughly chewed crinoid stem, also Pennsylvanian: I've figured that some gastropod is the culprit. Context is critical. Link to comment Share on other sites More sharing options...
Kehbe Posted December 2, 2011 Share Posted December 2, 2011 I found these at a new spot today, the small one, pic1 and pic2, is bulged out somewhat, inflated, in the middle, it appears caused by the 'puncture'. The large one, pic3 and pic4, the bore holes may be where something else was attached to it, in the right light it almost appears to have the radiating lines from center that a crinoid stem does, looking at from the end. Interesting none the less! pic1 pic2 pic3 pic4 It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change. Charles Darwin Link to comment Share on other sites More sharing options...
erose Posted December 2, 2011 Share Posted December 2, 2011 First one may be a gall. Second one is a normal section. The small circles are where cirri had been attached. Cirri are the short arms some crinoid stems had along their length. Missourian, that stem section is pretty cool. Maybe the same culprit as what attacked that cup. Link to comment Share on other sites More sharing options...
Missourian Posted December 2, 2011 Share Posted December 2, 2011 First one may be a gall. Second one is a normal section. The small circles are where cirri had been attached. Cirri are the short arms some crinoid stems had along their length. Missourian, that stem section is pretty cool. Maybe the same culprit as what attacked that cup. I think so too. They remind me of the gastropod borings in modern clam shells. Context is critical. Link to comment Share on other sites More sharing options...
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