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.

With the news, a 14-year-old, Paul E. Olsen who lived in Livingston, and his friend Tony Lessa started visiting the quarry to study them.

They made a cast from a footprint of Eubrontes giganteus and sent that to President Richard Nixon to get support.

The most productive portion was preserved and donated to the Essex County Park Commission and named after Walter Kidde.