Assertion: plesiosaur | /r/AtLocation | the 1870s
Facets:
Source sentences:
text: While early fossil collectors such as Benjamin Mudge concluded from plesiosaurs found in Kansas in the 1870s that the stomach stones were used as "an aid to digestion similar to many living reptiles and birds," Samuel Williston and others initially believed that they were swallowed for other reasons, including a food craving or being mistaken for prey.