The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah that makes up much of the famous prominent rock formations in protected areas such as Capitol Reef National Park and Canyonlands National Park. Photograph from Glen Canyon National Recreation Area, Utah.
The Lower Jurassic in western North America is quite different. It is continental in origin, sandstones laid down in shifting streams and rivers. These sandstones were laid down over a long period from the later Permian to the Lower Jurassic.