Genuine Mososaur teeth and bone from late creataceous period, approx 66-99 million years old from Morocco. This specimen has been observed by a qualified geologist.
Mosasaur (pronunciation: "moh-suh-sawr") - it means "Lizard of the Meuse River". Technically Mosasaurs are NOT DINOSAURS but we won't tell the kids if you want them to think its a dinosaur fossil. They are marine reptiles and are closely related to snakes and monitor lizard.
The Tylosaurus mosasaur shown on the Jurassic Park movie was the largest mosasaur to exist. In real life it grew up to 50 feet in length. It's hard to figure out the exact size of the mosasaur in the movie, but it's conservatively somewhere around 100 feet, which is at least twice the real life size.
Also, the Tylosaurus shown in Jurassic World looks more like an aquatic godzilla. In real life, evidence shows they had a caudal fin (tail) like a shark and very smooth snake-like skin.