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Topo

Rock Formations

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Topo

Ecoregions

Public Lands

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BASEMAPS

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Temperature

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WEATHER

Sedimentary rocks associated with Basin and Range extension. (IDQTpms;0)

Geologic Formation in ID, OR, MT, UT

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Geologic Age

Burdigalian – Gelasian (16 Ma – 2 Ma ago)

Geologic Unit Label

QTpms

Fluvial, fan, and lacustrine deposits and intercalated volcanic rocks of the Basin and Range Province (~16-2 Ma); consolidated to weakly consolidated sandstone, siltstone, arkose, conglomerate, mudstone, tuffaceous sediment, basalt, basaltic tephra, and rhyolite tuff. Includes deposits of Lake Idaho (Idaho Group) in western Snake River Plain and Salt Lake Formation deposited in Basin and Range Province of east-central Idaho. (Quaternary to Eocene Continental Sediments and Sedimentary Rocks).

— USGS

Taxonomy

Classified As

Geologic Formation