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Ernie Anderson, Lauren Wright, and Bennie Troxel were among the first to rec-ognize the coeval nature of magmatism and crustal extension in the Colorado River and Death Valley extensional terrains, respectively. The earliest magmatic rocks in the Colorado River extensional terrain include the 15.7 Ma Aztec Wash and 15.8-16.9 Ma Searchlight plutons as well as the 15.3-17.4 Ma Spirit Mountain batholith. The Aztec Wash and Searchlight plutons are well exposed, stratified plutons that show a similar range in composition from 45 to 75 wt% SiO2. Homogeneous granites that compose about one-third of each intrusion are nearly identical...

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