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The group has hardly changed in millions of years
Usually the two edges have equally developed serrations
See also Long 1992
Specimens tend to lighten in color over time due to weathering of the specimen surface into malachite
Rabano 1989 (trilobite)
30765 - Top Quality 3.23 Inch Otodus obliquus Shark Tooth in Matrix Paleocene Pseudocybele nasuta The group has hardly changedIt 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