17.3" Mosasaur Jaw with Four Large Teeth - Oulad Abdoun Basin, Morocco

This is a remarkable, 17.3" long mosasaur (Prognathodon sp.) jaw section with four rooted teeth and five unerupted teeth, collected from the Upper Cretaceous phosphate deposits in the Oulad Abdoun Basin of Morocco. The impressive preservation of this jaw and teeth is truly a sight to behold!

The jaw is accompanied by an acrylic/metal display stand.

The lack of repair and restoration is phenomenal, requiring only a small amount of gap fill restoration about 4" from the proximal end where the bone crumbled away. There are some additional repaired cracks through the jaw and teeth which have been skillfully repaired.

It comes from the massive phosphate deposits in the Oulad Abdoun Basin near Khouribga, Morocco. These deposits are mined for phosphate, one of Morocco's biggest exports. The fossils are collected as a byproduct of the mining operations, saving them from certain destruction by the rock crusher.

Mosasaurs are a family of enormous marine reptiles that truly dominated the seas 90 million years ago. They ruled during the last 20-25 million years of the Cretaceous period. With the extinction of the ichthyosaurs and decline of plesiosaurs, mosasaurs diversified to become prolific apex predators in nearly every habitat of the oceanic world.

Artists reconstruction of the mosasaur Prognathodon saturator.
Artists reconstruction of the mosasaur Prognathodon saturator.


Larger mosasaurs were the great leviathans of their time, extending 10–15m, or 33–49ft long. Hainosaurus holds the record for longest mosasaur, at a seemingly impossible 57ft. The smaller genera were still an impressive 10–20ft long. Mosasaurs probably evolved from semi-aquatic scaled reptiles which were more similar in appearance to modern-day monitor lizards. They had double-hinged jaws and flexible skulls (much like that of a snake) which enabled them to gulp down their prey almost whole.

The gruesome unchewed contents of fossilized mosasaur guts have revealed a varied diet of sea birds, ammonites, smaller marine lizards, possibly shark, and even other mosasaurs. Ammonites were especially crunchy mosasaur treats. They were abundant in the Cretaceous sea, and some Mosasaurs had specialized teeth for the job.



Mosasaurs probably lurked for an ambush, rather than hunt, possibly using their powerful tail flukes for extra thrust to dart out and swallow unsuspecting prey. Non-reflective, keeled scales may have been a great advantage to the Mosasaur sneak-attack.

Mosasaurs breathed air and gave birth to live young. The bronchi leading to the lungs run parallel to each other instead of splitting apart from one another as in monitors and other terrestrial reptiles. They were well-adapted to living in the warm, shallow, epicontinental seas of the period.

Although Mosasaurs diversified and proliferated at a spectacular rate, their specialization is considered the source of their demise when marine systems collapsed at the end of the Cretaceous.
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DETAILS
SPECIES
Prognathodon sp.
LOCATION
Oulad Abdoun Basin, Morocco
FORMATION
Phosphate Deposits
SIZE
Jaw: 17.3 x 7.9", Largest tooth crown: 1.75"
ITEM
#197373
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