Riker Hill Fossil Site (also referred to as Walter Kidde Dinosaur Park) is a 16-acre (6.5 ha) paleontological site in Roseland in Essex County, New Jersey, United States, located at the south western side of the borough at the border between Roseland and Livingston. It is one of the major sites in United States where a large number of dinosaur tracks are preserved. It was declared a National Natural Landmark in June 1971.