VOLCANIC ROCKS AND PROCESSES

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Edge of rhyolite flow, N. California

Aerial view of obsidian (rhyolite) lava flow on Medicine Lake Volcano and Mt. Shasta, northern California (140617-161)

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Obsidian and conchoidal fracture –volcanic glass

Conchoidal fracture in Mahogany obsidian hand sample. (140429-9)

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Vitrophyre in welded tuff, SE California

Students inspect vitrophyre (black glassy zone) in the 9.5 Ma Rhodes Tuff of SE California. (140427-61)

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Mt. St. Helens and crater, 2014

Aerial of Mt. St. Helens and crater with lava dome, 2014, Washington. (140221-118)

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Lahar deposit, western Cascades, Oregon

Eocene age lahar (volcanic mudflow) in the western Cascades of Oregon.

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Colonnade in basalt, Oregon

Colonnade–columnar jointing– in Picture Gorge Basalt, of the Columbia River Basalt Group, Oregon (110806-17)

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Pumice Deposit

Pumice deposit at Crater Lake in Oregon. Differently colored pumice from differences in iron-oxide content (Image ID# 5d-8638)

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