Assertion: plesiosaur's skeleton | /r/HasProperty | amongst first fossil vertebrates
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Source sentences:
text: The first plesiosaur skeletons were found in England by Mary Anning, in the early 1800s, and were amongst the first fossil vertebrates to be described by science.
text: The first plesiosaur skeletons were found in England by Mary Anning , in the early 1800s, and were amongst the first fossil vertebrates to be described by science.