From Gordee et al ., 2005; in press. From Gordee et al ., 2005; in press. From Gordee et al ., 2005; in press. columnar-jointed basaltic lavas at Butler Peak. pillowed basaltic-andesite lava flow at Butler Peak. stratabound pyrite in tuffaceous mudstone.
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A – normal fault
B – rhyolite domes
C – ca. 150 Ma (?) quartz monzonite stock
*rhyolite samples from this study area resemble FIIIa-type rhyolites,
as defined by Lesher et al., 1985
What else should be done?