On the ground an exchange began while the team were looking across the Canyon, with Maxwell saying to Phil Robinson, “I have to say Phil that it does put my mind to great periods of time. I see millions of years.”
Right there Maxwell has stepped into his imagination.
He did not observe the “long periods of time” he spoke of. He observed a big canyon. That’s it. He did not see “millions of years”. He imagined the time because he imagined the Colorado River carving the canyon. Yes, a little water would need a long time if that is what happened.
But he already knew that creationists speak of the canyon being carved by Noah’s Flood. A lot of water means a short time.
If I had been there I would have challenged Maxwell with, “Hey, Andrew, you don’t see millions of years. You imagine millions of years. That is because of what you are imagining in your mind about how you think the canyon formed. Andrew, open your mind to a different scenario. Allow yourself to imagine this …”
Then I would have painted a scenario of how the canyon was carved by the receding waters of Noah’s Flood, how the waters sat kilometres deep on the vast area of the plateau, how the waters would have drained, and how the features of the canyon are explained by that, but not explained by millions of years with the Colorado River.
There is an excellent paper by Peter Scheele that explains the Grand Canyon in these terms (see A receding Flood scenario for the origin of the Grand Canyon). It should be required reading for the likes of Andrew Maxwell so they can understand how the same evidence can be interpreted in a different way.