"Observations of erosion and depositional rates today are slow enough to indicate that a vast amount of time is required to deposit and erode, say, the sedimentary rocks of the Grand Canyon in Arizona."
"Over millions of years, the Colorado River has carved out the Grand Canyon from solid rock." Prentice Hall General Science 1992 p.174
"The Colorado River" has cut through layer upon layer of rock over millions of years." Prentice Hall Biology 1998, p. 279
There is geological evidence that at one time there were two lakes that have been named: Grand Lake, and Hopi Lake that covered parts of what is now Utah, Colorado, New Mexico, and Arizona. This area contained about 30,000 square miles of lakes. That is about 3 times the size of Lake Michigan today.
It looks as though those 2 great lakes emptied out in a location approximately where the Grand Canyon is today.
In 1980, Mt. St. Helens in the state of Washington had three volcanic eruptions in less than a two year period. The last eruption carved out a canyon about 1/40 the size of the Grand Canyon in about 6 minutes. Today you can see three separate finely stratified layers that were formed by those three eruptions.
Canyons can form in a short amount of time under certain conditions. Could the Grand Canyon have formed in a fairly short amount of time as well?