5.9" Fossil Mosasaur Jaw Section And Shark Teeth - Morocco

This is an excellent, 5.9" fossil jaw section of a Mosasaur (Halisaurus) from the Phosphate Deposits near, Khouribga, Morocco. It is a portion of the mandible (lower jaw) from the left side of the skull and contains three teeth. In addition to the jaw section this specimen contains bone fragments likely from Halisaurus, a tooth from a crow shark (Squalicorax) and a tooth from Otodus.

Artists reconstruction of a Halisaurus.  By Nobu Tamura
Artists reconstruction of a Halisaurus. By Nobu Tamura

Halisaurus is a comparatively small Mosasaur, maxing out at around 10 feet in length. It was a sleek and likely quick member of the family. Besides it's small size it it had distinctively, backward curving teeth that would likely have been used for grasping slippery prey like fish. A paper describing this species can be found below.

Description of new specimens of Halisaurus arambourgi BARDET & PEREDA SOBERBIOLA, 2005 and the relationships of halisaurinae

Otodus is an extinct mackerel (Lamniformes) shark that lived during the Eocene, approximately 54 million years ago. This is the same family of sharks that includes the Great White and there were likely a distant ancestor to the Megalodon. These teeth are collected during phosphate mining operations near Khouribga, Morocco. While teeth of Otodus are common fossils at these mines, large, good quality specimens are hard to find as they are often destroyed by the mining equipment.
Halisaurus arambourgi, Squalicorax sp., Otodus sp.
Khouribga, Morocco
Phosphate Deposits
5.9" jaw, 7.5 x 6.8" rock
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