This is a very robust, large and spectacular fossil partial lower jaw with all original teeth from a full-size, adult Miocene Era pinniped "sea lion" of the species Allodesmus kelloggi. The specimen comes from the famous Shark Tooth Hill deposits in California. The entire specimen has been carefully cleaned to expose very minute bone details and foramen. The original teeth include a partial incisor, as well as a complete large, canine fang and molar tooth. Color is beautiful and teeth display obvious natural feeding wear. The fossil is in its original condition with a single repair to the anterior end. The teeth were not added from other discoveries and are the original embedded teeth.
The rich Miocene fossil deposit known as "Sharktooth Hill" located in Bakersfield (Kern County), California has a reputation as the finest and most diverse fossil deposit of Miocene sharks, rays, bony fishes, turtles, birds and mammals (both marine and terrestrial) of the entire Pacific realm of North America. The formation is a result of silt spilling out of a prehistoric river delta into a Middle Miocene sea that once covered central California over 12 million years ago. This river originated in the nearby mountains east of Bakersfield. The fossil-bearing layer is thin ranging an average of only 6" - 18" thick but it spans approximately 100 square miles!