Ptychodus mammilaris
White Chalk, Cretaceous
South Ferriby, Humberside
This is a rare crushing shark tooth from the chalk of Humberside. I have only seen a handful of specimens from this location and much rarer than than specimens from the south coast. It is small and incomplete but a very rare specimen for the specialist collector.
The tooth measures approximately 18mm's x 17mm's x 11mm in height