Scapanorhynchus raphiodon Fossil Shark Teeth

My cousin has been extracting fossils from a piece of Carlile Shale Formation matrix. It was found in Grant County, South Dakota, USA. He has been slowly breaking it down to reveal the hidden fossil shark teeth.  The fossils date to the Cretaceous Period (Turonian). The picture shows Scapanorhynchus raphiodon shark teeth fossils.

Thanks to Kenny for the image.

Info Source:
http://en.wikipedia.org/wiki/Scapanorhynchus

http://www.elasmo.com/frameMe.html?file=genera/cretaceous/scapanorhynchus.html&menu=bin/menu_genera-alt.html

South Dakota Mosasaur Fossil Tooth?

My cousin has been extracting fossils from a piece of Carlile Shale Formation matrix. It was found in Grant County, South Dakota, USA. He has been slowly breaking it down to reveal the hidden fossil teeth.  The fossils date to the Cretaceous Period (Turonian). The picture shows what might be a mosasaur fossil tooth. Each scale division is a mm.

Thanks to Kenny for the images.

Sources:
http://oceansofkansas.com/aug98mos.html

http://www.bioone.org/doi/abs/10.1660/062.114.0101

Fossil Shark Teeth of South Dakota

My cousin recently received some matrix from the Carlile Shale Formation of 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). We have been trying to identify what they are. So far names I am considering are Leptostyrax, Cretalamna (Otodus), and Cretodus.

Thanks to Kenny for images.

Info Sources:
http://www.thefossilforum.com/index.php?/topic/41692-south-dakota-matrixteethclaws/

http://oceansofkansas.com/KS-sharks.html