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Bootheel Volcanic Field

31° 20' to 32° 20' N, 107° 50' to 109° +' W, Hidalgo County
35 Ma to 27 Ma
Collection of old calderas in extreme southwestern New Mexico
Rhyolite, andesite


Geological Overview

These calderas are part of the widespread volcanism that swept the Southwest during the Miocene. Like the Datil-Mogollon field to the immediate north, these have been broken up as part of the Basin and Range faulting and deeply dissected. Nonetheless, the centers of volcanism, and the fault-encircled extremely thick sections of outflow materials such as ash-flow tuffs and thick viscous lavas are evidence for the locations of the original calderas.


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