I recently picked up three cow shark teeth with uncertain identifications. I can not be sure myself so I thought I’d get some help sorting this out.
First one is 19mm and comes from the Pico Formation, Ventura County California. I believe it is Pliocene in age. I think it is a Hexanchus tooth but Notorynchus is known from at least one So Cal formation similar in age according to fossilworks. It is missing the largest cone. Even though I lean 6 Gill, I’m almost hoping somebody thinks 7 Gill because a California 7 Gill would be sweet lol Either way, it’s a really pretty tooth.
Next are two from the Miocene deposits of Gironde France. Notorynchus and Hexanchus are both described from this location and they are small partials. I really can not figure out if I have two Notorynchus or one of each. I’m rooting for a 6 Gill but a great location to add regardless of the ID.
All opinions are welcome.