Assertion: plesiosaur's skeleton | /r/HasProperty | discovered with stone
Facets:
value: in their stomachs
type: LOCATION
Source sentences:
text: Skeletons have also been discovered with gastroliths, stones, in their stomachs, though whether to help break down food, especially cephalopods, in a muscular gizzard, or to vary buoyancy, or both, has not been established.