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Sampling primitive older lavas in the Clear Lake Volcanic Field

By California Volcano Observatory 2024 (approx.)
A geologist wearing an orange cap, blue shirt, and work gloves holds a rock and a large sledgehammer. He is standing in a brushy clearing amid large gray boulders. Behind him, a steep rounded hill is scattered with similar boulders and topped by a thick lava flow covered in spindly trees and sagebrush.
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Detailed Description

USGS CalVO Research Geologist Seth Burgess collecting a sample of old, primitive lava in the Clear Lake Volcanic Field for geochemical analysis. USGS photo by Dawnika Blatter.

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Public Domain.

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