Hexanchus or Notorynchus

[fossilsonwheels]

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. 

[Notidanodon]

for the french ones i would lean towards notorhynchus

[Thecosmilia Trichitoma]

I can’t help, but I love the blue color of the first one!

[fossilsonwheels]

29 minutes ago, will stevenson said:

for the french ones i would lean towards notorhynchus

That is my lean as well.

[fossilsonwheels]

16 minutes ago, Thecosmilia Trichitoma said:

I can’t help, but I love the blue color of the first one!

It is a really pretty color and a pretty cool location too. Quite happy with it.

[JBMugu]

51 minutes ago, fossilsonwheels said:

It is a really pretty color and a pretty cool location too. Quite happy with it.

I am jealous, I live in Ventura County and I haven't found anything like that!

[fossilsonwheels]

1 minute ago, JBMugu said:

I am jealous, I live in Ventura County and I haven't found anything like that!

I got lucky. Happened to be on the auction site when it got listed. I could not hit buy it now fastest enough lol 

[Ludwigia]

The first one is definitely a Notorhynchus lateral, although it's missing the main point. The large root is an indicater. Hexanchus has a more narrow oblong one. The partials are also from Notorhynchus laterals.

[fossilsonwheels]

11 hours ago, Ludwigia said:

The first one is definitely a Notorhynchus lateral, although it's missing the main point. The large root is an indicater. Hexanchus has a more narrow oblong one. The partials are also from Notorhynchus laterals.

I can definitely go with that ID. Thank you