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Metasedimentary rock: Variously assigned to the Swauger Formation, Yellowjacket Formation, Lemhi Group, and/or Belt Supergroup along southest Montana-Idaho border (MTYs;0)
Geologic Formation
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Lithology
Argillite
Quartzite
Geologic Age
Mesoproterozoic (1600 Ma – 1000 Ma ago)
Geologic Unit Label
Ys
Beaverhead Mountains, southwestern Montana - Light gray quartzite with subordinate argillite, siltite, and calc-silicate rocks; unresolved unit that has been variously assigned to Yellowjacket Formation, Lemhi Group, Swauger Formation, or Belt Supergroup. Thickness as much as 2,700 m (8,858 ft).
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