At left: mosasaur flipper bone fresh out of a jacket. At right: flipper bone after some airscribe TLC.

Rear flipper-bone, fully encrusted with gypsum.

Same rear flipper-bone, half cleaned. This is all microscope-work to see up-close where the gypsum meets the bone.

Surprise! Look what was under the gypsum - bite marks! We know a lot of carcasses have been scavenged, but it’s always cool to see the evidence.