Everhart, M. J. 2000. Gastroliths associated with plesiosaur remains in the Sharon Springs Member (Late Cretaceous) of the Pierre Shale, western Kansas. Transactions of the Kansas Academy of Science, 103(1–2), 58–69.
Everhart, M. J. 2000. Gastroliths associated with plesiosaur remains in the Sharon Springs Member (Late Cretaceous) of the Pierre Shale, western Kansas. Transactions of the Kansas Academy of Science, 103(1–2), 58–69.