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Middle Miocene to Oligocene volcanic rocks (AZTv;0)
Geologic Formation
in
AZ
,
CA
,
NV
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Lithology
Andesite
Basalt
Dacite
Other
(9,725 mi²)
Geologic Age
Bartonian – Tortonian (38 Ma – 11 Ma ago)
Geologic Unit Label
Tv
Lava, tuff, fine-grained intrusive rock, and diverse pyroclastic rocks. These compositionally variable volcanic rocks include basalt, andesite, dacite, and rhyolite. Thick felsic volcanic sequences form prominent cliffs and range fronts in the Black (Mohave County), Superstition, Kofa, Eagletail, Galiuro, and Chiricahua Mountains. This unit includes regionally extensive ash-flow tuffs, such as the Peach Springs tuff of northwestern Arizona and the Apache Leap tuff east of Phoenix. Most volcanic rocks are 20-30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona, but this unit includes some late Eocene rocks near the New Mexico border in east-central Arizona. (11-38 Ma)
—
USGS
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Geologic Formation
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