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| | Geographic Focal Areas |
 | | Arizona's magnificent Grand Canyon may be the number-one geological wonder of the world, but the Mogollon Rim, an escarpment running in a northwest-to-southeast diagonal line fifty to one hundred and fifty miles south of the canyon, serves, by far, as the most purposeful Arizona geologic feature. |
 | | The Mogollon Rim is an extended and uniform geologic monocline or fold consequent to the region's plate tectonics, which formed it about thirty million years ago. |
 | | Because the Mogollon Rim monoclinal corridor is such an integrated feature of the obvious heartland of this region, its intrinsic nature as well as its geographic influence should, logically, be considered a "core feature" of the "Southwest." Prehistoric cultures flourished and endured due to the soil and water made possible by the Mogollon Rim. |
| digital.library.arizona.edu /jsw/3403/geog.html (5843 words) |
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