Limestone Posted July 26, 2017 Share Posted July 26, 2017 Hello, found this in northern Puerto Rico - middle to late oligocene limestone. Am I correct on the ID? thank you Link to comment Share on other sites More sharing options...
Carl Posted July 26, 2017 Share Posted July 26, 2017 I'm getting more of a crustacean feel from this one. 2 Link to comment Share on other sites More sharing options...
Arizona Chris Posted July 26, 2017 Share Posted July 26, 2017 Like a crab claw? ---------------------------------------------------------------------------------------------------------------------------- Arizona Chris Paleo Web Site: http://schursastrophotography.com/fossiladventures.html Link to comment Share on other sites More sharing options...
izak_ Posted July 26, 2017 Share Posted July 26, 2017 11 minutes ago, Arizona Chris said: Like a crab claw? To me more lobster or crayfish. I could be wrong. Link to comment Share on other sites More sharing options...
Carl Posted July 27, 2017 Share Posted July 27, 2017 Looks more like a limb segment than a claw. Link to comment Share on other sites More sharing options...
Al Dente Posted July 27, 2017 Share Posted July 27, 2017 Reminds me of the urchin spines found in the Ocala Limestone of Florida. The hollow nature of your fossil makes me question whether it really is an urchin spine since they tend to be solid with calcite growth filling the pore space. 1 Link to comment Share on other sites More sharing options...
Limestone Posted July 27, 2017 Author Share Posted July 27, 2017 Thank you all for your feedback. I wish I could take better pictures but I only have my phone at the moment. Link to comment Share on other sites More sharing options...
abyssunder Posted July 27, 2017 Share Posted July 27, 2017 I think you are correct with the echinoid (cidaroid) spine. cross sections of spines, excerpt from here pictures from different sources on a Google search I almost missed this spine structure 2 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Carl Posted July 28, 2017 Share Posted July 28, 2017 I'm an expert in neither echinoderms nor crustaceans so I'll go with the majority vote. Link to comment Share on other sites More sharing options...
caterpillar Posted July 28, 2017 Share Posted July 28, 2017 It could be an echinoid spine but I don't think so. An echinoid spine is like a crystal of calcite. When it's broken you see the calcite Here the fossil seems hollow like a crustacea limb http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
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