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WEATHER
Jurassic volcanic rocks (AZJv;0)
Geologic Formation
in
AZ
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Lithology
Rhyolite
Conglomerate
Sandstone
Other
(279 mi²)
Geologic Age
Hettangian – Oxfordian (200 Ma – 160 Ma ago)
Geologic Unit Label
Jv
Massive quartz-feldspar porphyry, generally interpreted as thick, welded rhyolitic tuffs, with locally abundant lava, and sandstone and conglomerate derived from volcanic rocks. Rare eolian quartzite units are interbedded in southern Arizona. Includes Ali Molina Formation, Mount Wrightson Formation, part of the Canelo Hills Volcanics, Cobre Ridge tuff, Black Rock volcanics, Planet Volcanics, and equivalent rocks. (160-200 Ma)
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USGS
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Geologic Formation
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