sentences:  Admission is free, however steep flagstone stairs may limit handicapped accessibility.The park was listed on the National Register of Historic Places on June 21, 1990.Dinosaurs represented in the park include "Apatosaurus", "Tyrannosaurus rex", "Triceratops", "Stegosaurus", and an "Edmontosaurus annectens" (formerly "Anatotitan" which itself was formerly "Trachodon").