Wholesale Box: 1-2" Fossil Mosasaur Teeth In Rock - 50 Pieces

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This is a wholesale box containing 50 fossil Mosasaur teeth all still partially embedded in the rock they were found in. They are Late Cretaceous in age from Khouribga, Morocco.

The teeth in this lot are primarily from the genus Prognathodon and the teeth measure 1-2" long with most being in the middle of that range. The rocks mostly measure about 3-4" wide. A few of the teeth have repaired cracks and/or have been remounted on the rock they came loose from during collection. The rocks frequently contain other fossils including fragments of bone, fish vertebrae and sometimes other teeth.

The photos are representative to the specimens you will receive but do not picture the exact specimens.

These teeth are collected as a byproduct of the massive phosphate mining operations near Khouribga. The locals collected the teeth and other fossils saving them from certain destruction by rock crusher. There are as many as 10 different species of Mosasaurs in these deposits, and determining the species of individual teeth is often difficult. A tooth morphology guide is linked below.

Tooth morphology of mosasaurid species from the Maastrichtian Phosphates of Morocco.

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.
$300 $225
23 Available
Mosasaur Teeth
Mostly Prognathodon sp.
Upper Cretaceous
Khourigba, Morocco
Teeth 1 to 2", Most about 1 1/2"