As a practicing geologist, the phrase that comes to mind is, "Woah, Dude! that's some rad shit!"
Definitely going to make things more interesting next spring.
Glad I wasn't scouting the rapid at the time. I'd hate to be at the bottom of that impact crater...
Thanks for posting this David.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse