Kenshu Shimada
Pictures
Contact between the Niobrara Formation (top) and Carlile Formation (bottom), where teeth of Late Cretaceous sharks are common (Ellis County, Kansas). Dr. Shimada has extensively worked on fossil sharks from the Niobrara Formation.
One of Dr. Shimada’s research sites (Russell County, Kansas), where rocks of the basal Greenhorn Formation (Upper Cretaceous) are exposed. Numerous shark and bony fish teeth as well as several remains of reptiles (e.g., plesiosaur, pterosaur, and aquatic lizard) have been recovered from this site.
Bottom (ventral) side of a remarkably well-preserved head of the Late Cretaceous shark, Cretoxyrhina mantelli, from western Kansas, showing numerous teeth in place on its jaws. Dr. Shimada has extensively studied the skeletal and dental anatomy of this shark. The specimen is exhibited at the Sternberg Museum of Natural History, Hays, Kansas.
Partial skeleton on the Late Cretaceous shark, Cretoxyrhina mantelli, which Dr. Shimada studied. The specimen preserves bones on Xiphactinus audax (large teleost) and mosasaur (marine lizard) as putative gastric residues of the shark. The specimen is exhibited at the University of Kansas Natural History Museum, Lawrence, Kansas.
Partial skeleton on the Late Cretaceous shark, Cretoxyrhina mantelli, which Dr. Shimada studied. This specimen preserves a complete set of jaws, part of the skull, and a string of vertebrae. The specimen is housed in the Sternberg Museum of Natural History, Hays, Kansas.
Tooth of the Late Cretaceous shark, Cretodus crassidens, from the Blue Hill Shale Member of the Carlile Formation in Ellis County, Kansas, as found.
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