The geology is in turn inextricably entwined with Colorado's human history.
Let's pause now to get oriented within and around our region of interest.
And so it goes with the bending of seemingly rigid rocks, the cutting of majestic canyons, the raising and erasing of entire mountain ranges, the opening and closing of globe-girdling oceans, and the incessant splitting and regrouping of the dancing continents.
Our usually reliable day-to-day sensibilities tell us that such things can't happen, but they can and do happen because solid rock reveals its malleability only over time scales very long compared to human eventstypically in spans of tens of thousands if not millions of years.
Under great confining pressures, or at depths where temperatures reach a significant fraction of their melting points (typically 10-15 km), rocks that are quite brittle at the surface become sufficiently plastic to deform without fracture at rates comparable to the rate at which fingernails grow (~10 mm/yr).
Granted, that makes molasses look downright mercurial, but then relative viscosity is the whole idea here.