The Morrison Formation, of which Dinosaur National Monument is a part, is the source for contention among scientists as to its origin.
SOURCES:
Kris Kristalka
Filmed for "The Monsters Emerge", The Dinosaurs!, WHYY, 1992.
James Kirkland
Filmed for When Dinosaurs Roamed America, Discovery Communications, Inc., 2001.
Photo credit:
Morrison formation picture & map by Ian Juby
