This is a cast of sword ray pectoral fin of a
Xiphactinus audax. It was collected by M. Triebold in 1993 at Lane County Kansas USA. Fossil dates to the Late Cretaceous Period (85 million years ago).
Fossil on display at
American Museum of Natural History in New York City USA as of July 2018.
Image below is a composite of 3 pictures.
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