New Members caggis Posted July 5 New Members Share Posted July 5 I have acquired this mako tooth, it is from the Oligocene and comes from Summerville, SC. In your opinion is the species desori of retroflexus? Thanks in advance! 1 Link to comment Share on other sites More sharing options...
Fin Lover Posted July 5 Share Posted July 5 (edited) I believe Isurus are Miocene or younger, not Oligocene. Edited July 5 by Fin Lover Clarification Fin Lover Link to comment Share on other sites More sharing options...
New Members caggis Posted July 5 Author New Members Share Posted July 5 I am no expert, in fact I am new to collecting shark teeth. However most sources seem to agree that Isurus was an established genus in the Oligocene, in fact their ancestor Macrorhizodus dates back to the Eocene. Link to comment Share on other sites More sharing options...
Fin Lover Posted July 5 Share Posted July 5 (edited) Sorry, let me rephrase that. The genus itself may have originated in the late Paleocene, but the oxyrinchus and retroflexus that you find in Summerville are coming out of Miocene-Pliocene formations (or reworked in Pleistocene lag deposits)...at least, according to everything I've read and from personal experience. If you have something stating otherwise, I'd love to read it...the more I can learn about the area, the better. Edited July 5 by Fin Lover Fin Lover Link to comment Share on other sites More sharing options...
New Members caggis Posted July 5 Author New Members Share Posted July 5 Thank you I was not aware of this! I am from Italy, have never been to the area and have no in depth geologic knowledge of it. As I said this is new for me. I purchased this tooth online, could the information about it have been inaccurate? What do you think it could be then? An upper narrow hastalis perhaps? Link to comment Share on other sites More sharing options...
Fin Lover Posted July 5 Share Posted July 5 I think it's an Isurus, I just doubt that it came out of an Oligocene formation. Summerville is a mess/mix of formations and epochs, so it's easy to get formations wrong there, especially since a lot of fossils are found ex-situ. From what I've heard, some sellers just use the Chandler Bridge Formation (Oligocene) as a catch-all for teeth found in the area, even if it's not accurate. Fin Lover Link to comment Share on other sites More sharing options...
New Members caggis Posted July 5 Author New Members Share Posted July 5 Do you think this is a longfin? It was listed as desori but it seems very broad to me. I do not understand how to properly recognize shortfin and longfin teeth. There seems to be a great deal of overlap especially for anterior teeth. I have read about the ridge on the labial side but it is not very clear from the photos I have seen. Could you offer some insight on how to differentiate them? Thanks again. Link to comment Share on other sites More sharing options...
Fin Lover Posted July 5 Share Posted July 5 I would say oxyrinchus (desori) 1 Fin Lover Link to comment Share on other sites More sharing options...
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