Assertion: plesiosaur's skeleton | /r/HasProperty | discovered by early paleontologist
Facets:
value: in sinemurian
type: LOCATION
Source sentences:
text: The first complete skeleton of Plesiosaurus was discovered by early paleontologist and fossil hunter Mary Anning in Sinemurian (Early Jurassic)-age rocks of the lower Lias Group in December 1823.