old digger Posted December 24, 2015 Share Posted December 24, 2015 Hi All, This object was found in the Sunrise Formation of Nevada in direct association with definite Sinemurian ammonites. It resembles an orthoconic nautiloid, but these became extinct at the end of the Triassic. It is possibly a belemnite, but the completely circular cross section is unlike most belemnites I have seen. It appears to have widely spaced septa but there is no evidence of a siphuncle in section. The object is about 60mm long. Any suggestions? Link to comment Share on other sites More sharing options...
fossisle Posted December 24, 2015 Share Posted December 24, 2015 Phragmocone from a large Belemnite Cephalopods rule!! Link to comment Share on other sites More sharing options...
fossilized6s Posted December 24, 2015 Share Posted December 24, 2015 (edited) Looks like a Belemnite to me as well. Edited December 24, 2015 by fossilized6s ~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...
andreas Posted December 24, 2015 Share Posted December 24, 2015 (edited) Hi, It is more probably a phragmocon of Atractites sp. They range from Triassic into the lower Jurassic. The Sipho should be at the side not in the center. This genus is common in the Sinemurian of Austria too. If you want I can take pics from mine. regards Andreas Edited December 24, 2015 by andreas 1 Link to comment Share on other sites More sharing options...
Guguita2104 Posted December 24, 2015 Share Posted December 24, 2015 (edited) Belemnite, in my opinion Atractites as Andreas said. Edited December 24, 2015 by Guguita2104 Link to comment Share on other sites More sharing options...
old digger Posted December 24, 2015 Author Share Posted December 24, 2015 Thanks to everyone for the replies. It does in fact closely resemble pictures of Actractites. Paleontology Database shows numerous occurrences of this genus in the Triassic of Nevada, but none in the Jurassic. It is reported from the early Jurassic of British Columbia. So, this could be the first report of the genus from the Jurassic of Nevada. Thanks again for your help. Link to comment Share on other sites More sharing options...
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