Otodus obliquus (AKA Lamna): is an extinct Mackerel shark which lived during the Paleocene- Eocene epochs (approximately 60-45 million years ago). This shark had large teeth (up to 4") with smooth cutting edges and large sidecusps on the side. Otodus obliquus began to evolve serrated edges (like a steak-knife) during the middle of the Eocene epoch (appx 45 million years ago). Fossil remains of this ferocious shark have been found in the form of shark's teeth around the world, most notably in the phosphate mines of Kouribgha, Morocco. This formation dates back to aproximately 65 million years ago. It is one of the richest prehistoric marine life formations in the world. The only remains of this shark that have been found in this formation, are teeth and vertebrae, and the reason behind that, is because most of sharks' bone structure is made up of cartilage.
