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MAP

Topo

Rock Formations

Measure

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Topo

Ecoregions

Public Lands

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BASEMAPS

Default Weather

Temperature

Smoke

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WEATHER

Pleistocene-Recent volcanic rocks (WAQv;0)

Geologic Formation in WA

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Lithology

Rhyolite

Dacite

Rhyolite

Other (5,413 mi²)

Geologic Age

Early Pliocene – Holocene (5.33 Ma ago – 2020)

Geologic Unit Label

Qv

Predominantly dark-gray to black vesicular basalt; olivine-rich in part. Includes andesite flows and pyroclastic rocks of Mount Baker, Glacier Peak, Mount Rainier, Mount Adams, Mount St. Helens, and all cinder cones in southern part of the State. Also includes some Recent flows southeast of Mount St. Helens.

— USGS

Taxonomy

Classified As

Geologic Formation