I hitched a ride down there with a past geology professor who was take a class on a spring break field trip. This ment we had to stop constantly to look at the rocks and discuss the geologic processes of the region. However, I was more focused on hiking the canyon and less on the geology aspect which did not leave the lasting impression.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe