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These authors look vaguely familiar... :-)
C.R. McHenry, A.G Cook, and S. Wroe (2005). Bottom-feeding plesiosaurs.
Science 310: 75.
Abstract "Elasmosaurid plesiosaurs were an important part of Cretaceous
marine reptile communities and are generally considered to have been
predators of small, agile, free-swimming fish and cephalopods. Two
elasmosaurid specimens from Aptian and Albian deposits in Queensland,
Australia, include fossilized gut contents dominated by benthic
invertebrates: bivalves, gastropods, and crustaceans. Both specimens also
contained large numbers of gastroliths (stomach stones). These finds point
to a wider niche than has previously been supposed for these seemingly
specialized predators and may also influence long-running controversy over
the question of gastrolith function in plesiosaurs."