Dinosaur Valley State Park, located just northwest of Glen Rose in Somervell County, is a 1,524.72-acre scenic park set astride the Paluxy River. The land for the park was acquired from private owners under the State Parks Bonds Program during 1968 and opened to the public in 1972. Eastward-dipping limestones, sandstones and mudstones, deposited approximately 113 million years ago along the shorelines of an ancient sea, form the geological setting for the park area. Over the last million years or so, these layered formations have been dissected and sculpted by the Paluxy River, which in many places has cut down to resistant beds and planed off sizable exposures of rock in the river bottom.