There is lots of room for latitude in
this definition, but basically, the Rockies are a large mountain chain that were formed by
compression (roughly in an east-west direction) and uplift of the Earth's crust.
Geologists call this uplifting, which took place in the earliest part of the
Tertiary period (about 65 million years ago), the Laramide Orogeny.
Technically speaking, none of the mountains in Arizona are part of the Rocky
Mountains. They lie further to the east, in New Mexico, and northeast in Colorado.
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