Abstract
The Jemez Mountains volcanic field, New Mexico, is one of the best known volcanic centers in the world because of pioneering efforts by C. S. Ross, R. L. Smith, R. A. Bailey, and their coworkers in the U.S. Geological Survey [Ross et al., 1961; Bailey et al., 1969; Smith et al., 1970]. The field contains roughly 2000 km3 of basaltic through rhyolitic rocks, dominated volumetrically by andesites. The most significant activity was formation of the Toledo and Valles calderas during eruption of over 600 km3 of rhyolitic ash flow tuffs, the Bandelier tuff, during two phases 1.5 and 1.1 m.y. ago [Smith and Bailey, 1966; Doell et al., 1968; Izett et al., 1981]. Many concepts of pyroclastic flows and ignimbrites were based upon work in this volcanic field by Ross and Smith [1961].
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