The sea turtle fossil pictured is a Toxochelys latiremis found in the Pierre Shale Formation of Kansas, USA. This area was part of the Western Interior Seaway that divided what is today North America into two land masses. It dates back 75 million years ago (Upper Cretaceous Period).
The fossil is part of the Cincinnati Museum Center collection (accession number VP6947). It was gift to the museum from Jerome "Pete" Bussen.
Fossil on display at Cincinnati Museum of Natural History & Science as of August 2013.