This image is of Platecarpus ictericus mosasaur skull fossil on display at Mace Brown Museum of Natural History (August 2017). It dates to the Campanian Age (about 80-85 million years ago), Late Cretaceous Period. The fossil was found in the Upper Niobrara Formation, Iowa, USA.
Learn more at their blog: http://blogs.cofc.edu/macebrownmuseum/