2 XL Fossilized MOSASAUR Teeth Fully Rooted in their own Jaw Sections. The sections measure 6" Long x 5" Wide x 3" Thick and 6" Long x 4" Wide x 3" Thick. The Total Weight for both is 3 lbs. Mosasaurs lived during the Late Cretaceous Period, from about 90 million years ago until they went extinct around 66 million years ago. ROCKS FOSSILS MINERALS