If you need more help with geologic time or terminology, check out these resources.
Colorado's geologic history is as complex as it is fascinating.
Colorado's also part of an immense, heterogeneous and longstanding tectonic upland covering the entire western third of the United States and ultimately can only be understood in that context.
From the Middle Proterozoic on, much of Colorado's story also applies, with some notable exceptions, throughout the Southern Rockies* and the Colorado Plateau.
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.