Geosphere; February 2008; v. 4; no. 1;
p. 1-35; DOI: 10.1130/GES00122.1
© Geological Society of America
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Figure 7. Simplified geologic map of the Tuscarora volcanic field with 40Ar/39Ar dates of ash-flow tuffs (Henry et al., 1999). Magmatism, including eruption of the tuff of Big Cottonwood Canyon at 40.0 Ma, occurred over a brief, intense period between 40.2 and 39.5 Ma. Any paleovalley is largely buried, but pre-volcanic conglomerate is exposed along the southern and southeastern flank of the volcanic field.
Copyright © 2008 by Geological Society of America
