MATSUMOTO, OBATA, OKAZAKI & KAINE, 1982
Locality: R4701, on the right side of the main stream of the River Obirashibetsu near Kawakami, Obira Area, Hokkaido, Honshu Island, Japan.
Horizon:
Biostratigraphy:
Age: Late Cretaceous.
Material:
Number: Not given: Fragmentary remains.
Note: Found with cephalopod jaws and 23 chert, sandstone, siltstone and andesite
gastroliths.
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SHIMADA, 1997
Locality: Kansas.
Horizon: Smoky Hill Member, Niobrara Formation.
Biostratigraphy:
Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material:
KUVP 68979: 41 very large vertebrae (100mm in diameter), partial radial cartliages
of pectoral fin that my be plesoide, and scatterd placoid scales with servral
grooves on the corns surface.
Note: Possible plesiosaur gastroliths found near the stomach region. The shark
may have feed on the plesiosaur.