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Early Proterozoic metasedimentary rocks (AZXms;0)
Geologic Formation
in
AZ
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Lithology
Schist
Conglomerate
Geologic Age
Statherian (1800 Ma – 1600 Ma ago)
Geologic Unit Label
Xms
Metasedimentary rocks, mostly derived from sandstone and shale, with minor conglomerate and carbonate rock. Includes quartz-rich, mostly nonvolcanic Pinal Schist in southeastern Arizona and variably volcanic-lithic sedimentary rocks in the Yavapai and Tonto Basin supergroups in central Arizona. (1600-1800 Ma)
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Geologic Formation
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