Harleyville, SC fossil shark teeth...Isurus praecursor and Brachycarcharinas??

[fossil_lover_2277]

Hey! I recently found these shark teeth fossils in Harleyville, SC. They come from Eocene strata. As best I can tell, I think they are Isurus praecursor and Brachycarcharias, but I’m no expert in identifying Eocene shark teeth...can someone either confirm or correct this? Thanks!!

[Al Dente]

The tooth with the side cusps is most likely Brachycarcharias. Some or all of the other teeth could be Macrorhizodus praecursor.

[fossil_lover_2277]

Thanks! I looked up Macrorhizodus online and apparently it’s ancestral to Isurus, but then some places it’s lumped together as the same with it, what’s going on with that?