The Mosaleum Part 2, Mosasaur Bones

After death the mosasaur sank to the bottom of the sea, where it was scavenged before being covered in sediment and fossilizing.  Most of the skeleton was scattered, but the skull and much of the spine has been found.

Bitemarks, indicated by arrows

The bones in the Mosaleum in fact preserve evidence of being scavenged in the form of bitemarks. Beyond the bitemarks, there is also further evidence identifying the culprits.