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Holocene to middle Pliocene basaltic rocks (AZQTb;0)
Geologic Formation
in
AZ
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Lithology
Basalt
Andesite
Dacite
Other
(3,838 mi²)
Geologic Age
Zanclean – Holocene (4 Ma ago – 2020)
Geologic Unit Label
QTb
Mostly dark-colored basaltic lava and cinders young enough that some original volcanic landforms are still apparent. Includes a small amount of andesite, dacite, and rhyolite. Rocks of this map unit are largely restricted to six areas widely distributed in Arizona: San Francisco and Uinkaret volcanic fields in northern Arizona (0-4 Ma); Springerville (0-4 Ma) and San Carlos (0-2 Ma) volcanic fields in east-central Arizona; and San Bernardino (0-1 Ma) and Sentinel (1-4 Ma) volcanic fields in southern Arizona. Rocks of this unit are also present in the extreme southwestern part of Arizona where they were erupted at the edge of the Pinacate volcanic field (0-2 Ma) in northwestern Sonora. (0-4 Ma)
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USGS
Taxonomy
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Geologic Formation
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