Ptychotrygon triangularis Fossil

This fossil was found in the Carlile Shale Formation of Grant County, South Dakota, USA. He has been carefully extracting the hidden fossil shark teeth.  The fossils date to the Cretaceous Period (Turonian). The picture shows what appears to be a Ptychotrygon triangularis sawfish rostral denticle fossil. Field of view (FOV) is about 3 mm.

Thanks to Kenny for the image.

Info Sources:

http://www.phatfossils.com/species.php?species=Ptychotrygon%20Triangularis

Cantioscyllium decipiens Shark Fossil Tooth

My cousin has been working on some Carlile Shale Formation matrix. It was found in Grant County, South Dakota, USA. He has been carefully extracting the hidden fossil shark teeth.  The fossils date to the Cretaceous Period (Turonian). The picture shows what appears to be a Cantioscyllium decipiens tooth fossil. Field of view (FOV) is about 3 mm.

Thanks to Kenny for the image.

Info Sources:
http://www.chalk.discoveringfossils.co.uk/5%20Cantioscyllium.htm

http://fossilsofnj.com/shark/c_decipiens.htm

Brachyrizodus (Pseudohypoluphus) Fossil Tooth

My cousin has been analyzing some Carlile Shale Formation matrix. It was found in Grant County, South Dakota, USA. He has been carefully breaking it down to extract the hidden fossil shark teeth.  The fossils date to the Cretaceous Period (Turonian). The picture shows what appears to be a Brachyrizodus (Pseudohypoluphus) sp. tooth fossil. Field of view (FOV) is about 3 mm.

Thanks to Kenny for the image.

Info:
http://oceansofkansas.com/ks-sharks.html