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Granitic rocks of 2,600-Ma Age Group (WYWg;0)
Geologic Formation
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WY
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Lithology
Granite
Amphibolite
Granodiorite
Geologic Age
Precambrian Archean (4000 Ma – 2500 Ma ago)
Geologic Unit Label
Wg
Teton Range–Mount Owen Quartz Monzonite. Age 2,500+/- Ma; may be of Early Proterozoic age. Gros Ventre and Washakie Ranges–Granitic rocks. Yellowstone National Park, Owl Creek, Granite, and Seminoe Mountains, Rawlins uplift, and Medicine Bow Mountains–Granite. Wind River Range–Granodiorite to porphyritic and equigranular granite. Sierra Madre–Granite and granodiorite. Laramie Mountains–Granite, amphibolite, and minor amounts of metasedimentary rocks. Hartville uplift–Granite and quartz monzonite. Black Hills uplift–Granite and minor amounts of metasedimentary rocks.
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USGS
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Geologic Formation
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