Apatosaurus "Apatosaurus" may have been more solitary than other Morrison Formation dinosaurs. Fossils of the genus have only been found in the upper levels of the formation. Those of "Apatosaurus ajax" are known exclusively from the upper Brushy Basin Member, about 152–151 mya. "A.louisae" fossils are rare, known only from one site in the upper Brushy Basin Member; they date to the late Kimmeridgian stage, about 151mya. Additional "Apatosaurus" remains are known from similarly aged or slightly younger rocks, but they have not been identified as any particular species, and thus may instead belong to "Brontosaurus". The Morrison Formation records a
Jurassic Park: The Ride adult Stegosaurus and its young. Two Compsognathus were seen fighting over an empty popcorn box before the boat entered Hadrosaur Cove, where a Parasaurolophus poped up in front of the raft, and sprayed water at the riders. The Jurassic Park Animal Control called, revealing that the Parasaurolophus threw the raft off course, causing it to enter the raptor containment area, which was shown to be heavily damaged. Riders then encountered what appeared to be an abandoned tour raft, where a Dilophosaurus was seen eating the remains of a poncho. A nearby motorboat was also abandoned, sent by Jurassic Park Animal