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USGS Fact Sheet Traces 40 Million Years of Tectonics and Volcanism in Western California
December 01, 2025

WASHINGTON, Dec. 1 (TNSLrpt) -- The U.S. Geological Survey issued Fact Sheet 2025-3013 in August 2025, titled 'Plate Tectonics and Volcanism in Western California,' authored by Seth Burgess under the U.S. Department of the Interior and the USGS California Volcano Observatory. The document explains how the volcanic rock record across western California reveals the interplay between shifting plate boundaries and volcanism over the past 40 million years.

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