darrenrx Posted November 25, 2015 Share Posted November 25, 2015 Hi Fossil Forum, I need help in identifying a fossil my friend found in middle Georgia. The area where he found it has been reported to have fossils from the Ordovician Period. It was found in a soft limestone sedimentary rock and appears to be a tusk shell or a sea urchin spine. Any idea what this is? Thanks, Darren Link to comment Share on other sites More sharing options...
DPS Ammonite Posted November 25, 2015 Share Posted November 25, 2015 The curve suggests a tusk shell. Take a photo of the ends to see if it shows the shell and cavity of a tusk shell or if it a single crystal of calcite all the way across with cleavage which suggests that it is an echinoid spine. Each echinoid spine is composed of a single crystal of calcite that grows with age. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Coco Posted November 25, 2015 Share Posted November 25, 2015 Hi, I don't think it is a sea urchin spine. It is very often in calcite, and calcite sea urchin spine often breaks itself with an angle about 45 °, what is not the case here. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
FossilDAWG Posted November 25, 2015 Share Posted November 25, 2015 Tusk shell (Dentalium sp), Eocene, Ocala Limestone. Not Ordovician. Don Link to comment Share on other sites More sharing options...
darrenrx Posted December 7, 2015 Author Share Posted December 7, 2015 My friend went back to the same area in houston county and identified the layer as Tivola limestone from the Eocene period. I have a few more examples and two photos of the tusk shell end. Link to comment Share on other sites More sharing options...
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