30765 - Top Quality 3.23 Inch Otodus obliquus Shark Tooth in Matrix Paleocene Pseudocybele nasuta It includes a brief explanation

It includes a brief explanation of the stratigraphic concepts that have been established formally until today in the studies of this sector of Morocco

The group has hardly changed in millions of years

Very rare mosasaur

See also Long 1992

for example

30765 - Top Quality 3.23 Inch Otodus obliquus Shark Tooth in Matrix Paleocene Pseudocybele nasuta It includes a brief explanationIt is a tooth from an enormous shark species Otudus obliquus. It is preserved in its natural matrix. Its preservation is very good, with a premium quality enamel. Otudus is a genus belonging to the shark group known as mackerel sharks. It reigned the seas during the Paleocene and the Eocene (60 45 million years ago). It is a quite dominant species in the phosphate quarries in this sector of Morocco. This species has only been described via its teeth