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Mosasaur (Eremiasaurus) Jaw Section On Stand
This is an awe inspiring fossil, a jaw section (yes, a real one) from one of the most fearsome predators to ever inhabit our oceans, the Mosasaur. It comes from the Upper Cretaceous, phosphate deposits in the Oulad Abdoun Basin of Morocco. The jaw section is 5.7 inches long and the largest tooth is about 2.8 inches including the root. There are many different species/genus of Mosasaur in these deposits but this one should be Eremiasaurus heterodontus (LeBlanc, A.R.H., Caldwell, M.W. and Bardet, N. 2012).
Most of the teeth have been remounted with the exception of the one on the left. Teeth are very rarely found in place in Mosasaur jaws. One of the cool aspects of the anatomy shown is you can see the unerupted teeth inside the jaw growing into place. Mosasaurs like sharks and dinosaurs had teeth that replaced themselves as they grew or became worn.
The stone base is made out of fossiliferous rock and you can see fossils of Orthoceras (a straight cephalopod) in it.
You will see hundreds of purported Mosasaurus jaws and jaw sections available at rock shops, shows and online, but nearly 100% of them are fakes. They are crudely constructed using plaster or modern animal bones with real Mosasaurus teeth mounted in them. Real Mosasaurus bones and jaw material like this is quite rare.
Most of the teeth have been remounted with the exception of the one on the left. Teeth are very rarely found in place in Mosasaur jaws. One of the cool aspects of the anatomy shown is you can see the unerupted teeth inside the jaw growing into place. Mosasaurs like sharks and dinosaurs had teeth that replaced themselves as they grew or became worn.
The stone base is made out of fossiliferous rock and you can see fossils of Orthoceras (a straight cephalopod) in it.
You will see hundreds of purported Mosasaurus jaws and jaw sections available at rock shops, shows and online, but nearly 100% of them are fakes. They are crudely constructed using plaster or modern animal bones with real Mosasaurus teeth mounted in them. Real Mosasaurus bones and jaw material like this is quite rare.
About Mosasaurs
Mosasaurs were large, carnivorous marine reptiles that lived during the Late Cretaceous Period, approximately 90 to 66 million years ago. Though often mistaken for dinosaurs, they were actually more closely related to modern monitor lizards, including the Komodo dragon. Over time, their ancestors transitioned from land to sea, evolving paddle-like flippers, streamlined bodies, and powerful tails that made them highly efficient swimmers. Some species developed crescent-shaped, shark-like tail fins that allowed for strong, sustained propulsion through open water. Sizes varied widely, with many species measuring 20 to 30 feet long, while the largest—such as Mosasaurus hoffmannii—may have exceeded 50 feet in length.
As apex predators, mosasaurs occupied the top of the marine food chain. Their long jaws were lined with sharp, conical teeth ideal for gripping slippery prey, and fossil evidence shows they fed on fish, sharks, ammonites, seabirds, and even other mosasaurs. Despite their fully aquatic lifestyle, mosasaurs were air-breathing reptiles and had to surface regularly, much like modern whales. They thrived in oceans around the world until the Cretaceous–Paleogene extinction event 66 million years ago, which wiped out the dinosaurs and many marine reptiles, bringing the age of mosasaurs to an end.
Mosasaurs were large, carnivorous marine reptiles that lived during the Late Cretaceous Period, approximately 90 to 66 million years ago. Though often mistaken for dinosaurs, they were actually more closely related to modern monitor lizards, including the Komodo dragon. Over time, their ancestors transitioned from land to sea, evolving paddle-like flippers, streamlined bodies, and powerful tails that made them highly efficient swimmers. Some species developed crescent-shaped, shark-like tail fins that allowed for strong, sustained propulsion through open water. Sizes varied widely, with many species measuring 20 to 30 feet long, while the largest—such as Mosasaurus hoffmannii—may have exceeded 50 feet in length.
As apex predators, mosasaurs occupied the top of the marine food chain. Their long jaws were lined with sharp, conical teeth ideal for gripping slippery prey, and fossil evidence shows they fed on fish, sharks, ammonites, seabirds, and even other mosasaurs. Despite their fully aquatic lifestyle, mosasaurs were air-breathing reptiles and had to surface regularly, much like modern whales. They thrived in oceans around the world until the Cretaceous–Paleogene extinction event 66 million years ago, which wiped out the dinosaurs and many marine reptiles, bringing the age of mosasaurs to an end.
SPECIES
Eremiasaurus heterodontus
AGE
LOCATION
Oulad Abdoun Basin, Morocco
FORMATION
Phosphate Deposits
SIZE
Jaw section 5.7" long, Largest tooth 2.8" including root
CATEGORY
SUB CATEGORY
ITEM
#11507
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