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Early Proterozoic metasedimentary rocks

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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)
State Arizona
Name Early Proterozoic metasedimentary rocks
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Schist (Amphibolite)
Metamorphic > Metasedimentary (Amphibolite)
Minor
Sedimentary (Bed)variably volcanic-lithic sedimentary rocks
Sedimentary > Carbonate (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Stratigraphic units Pinal Schist, Yavapai Supergroup, Tonto Basin Supergroup, Vishnu Schist
References

Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.

Anderson, P., 1989, Stratigraphic framework, volcanic-plutonic evolution, and vertical deformation of the Proterozoic volcanic belts of central Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Ge

Conway, C.M., and Silver, L.T., 1989, Early Proterozoic rocks (1710 - 1615 Ma) in central and southeastern Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 165-18
NGMDB product
Counties Coconino - Gila - Graham - Greenlee - Maricopa - Mohave - Pima - Pinal - Yavapai