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BASEMAPS
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Smoke
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WEATHER
Middle Proterozoic sedimentary rocks (AZYs;0)
Geologic Formation
in
AZ
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Lithology
Quartzite
Shale
Sandstone
Other
(3,994 mi²)
Geologic Age
Ectasian – Cryogenian (1300 Ma – 700 Ma ago)
Geologic Unit Label
Ys
Red-brown shale and sandstone, buff to orange quartzite, limestone, basalt, black shale, and sparse conglomerate. This unit includes the Grand Canyon Supergroup, Apache Group, and Troy Quartzite. These rocks were deposited in shallow marine, coastal nonmarine, and fluvial settings. (700-1300)
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USGS
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Geologic Formation
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