Hello guys!
I saw these shark teeth from Ryazan, Russia.
The first 6 ( you can put numbers to the teeth according to the order of the pictures ) are identified as Archeolamna.
The second 4 are identified as Cretalamna.
I am very sure some are not IDed correctly, some swapped btw Cretalamna and Archeolamna and some are completely different species.
I really appreciate the help, and if someone could tell me the complete specie name from that location, that would be awesome