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BASEMAPS
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WEATHER
Absaroka Volcanics Supergroup
Geologic Formation
in
ID
,
MT
,
WY
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Lithology
Andesite
Dacite
Basalt
Geologic Age
Ypresian (56 Ma – 47.8 Ma ago)
Geologic Unit Label
Tav
Calc-alkalic andesite and dacite extrusive rock with lesser amounts of potassic, alkalic, and mafic lava; minor amounts of rhyodacitic ash-flow tuff associated with mafic lava; and dark gray, very fine-grained basalt or andesite intrusive breccia.
—
USGS
Taxonomy
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Geologic Formation
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