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After an introductory section, Colorado's geologic history will unfold in chronological order below.

The pink feldspar bands in the severely deformed metamorphic rock at right (a mylonite from the Homestake Shear Zone in the northern Sawatch Range) show the kind of internal folding you'd expect from warm taffy, but this rock didn't actually melt.

Events in the Basin and Range and along the West Coast have also influenced Colorado's physical development, particularly from ~80 Ma on.

Let's pause now to get oriented within and around our region of interest.

The entire Mesozoic Era (295 Ma long) shot by in under an hour, the dinosaurs departed just 20 minutes ago (thank goodness), and we've been comfy and relatively ice-free for only a mere 0.2 seconds.

A healthy human female can expect to live just under 2 milliseconds in a developed country.