Canyonlands National Park
Grand Canyon, North Rim
Grand Canyon, South Rim
Geological InformationThe uniqueness of these parks is due to their unique geology. If you are interested in geology, I recommend examining the following references before you go (or take them with you):
National Parks of the Colorado Plateau. Page 12 has a nice diagram for Canyonlands
A geological walk-through of Monument Valley. Page 29 has a copy of a 1969 geological map of the park.
Geological trail guide to Zion
Wikipedia’s entry on Zion has some helpful geological information
Wikipedia has a special entry for Grand Canyon Geology
Grand Canyon Geology
About three-quarters of the way down the page is an excellent annotated picture of the Grand Canyon’s geological layers.