Problem
1) Dr. Joel Pederson's investigations in Lee's Ferry suggested the Colorado River's canyon cutting rate at about 1000 feet per million years. How did he come up with this estimate?
2) What are the oldest rock units in the Grand Canyon? How old are these rocks?
3) The average depth of the Grand Canyon is 5300 ft. If the canyon cutting rate of the Colorado River is estimated at about 1000ft/million years, how old is the Grand Canyon approximately?
4) What are some data/evidence that geologists use to uncover what the Grand Canyon looked like in the past?
5) Lake Bidahochi is located approximately 100 miles east of the Grand Canyon. How was Dr. John Douglass's Spill-Over Theory proven by the green clay deposits of lake Bidahochi?