Nature
Tumble Buttes is a compact volcanic chain in northern California near the Lassen Volcanic Center, formed along a fissure rather than as a single mountain. The group includes 13 monogenetic cinder cones with lava flows, among them Bear Wallow Butte, Eiler Butte, and Hall Butte, aligned in a pattern that parallels regional fault zones. Its rocks include basaltic andesite and andesite, and its eruptions span from about 75,000 to 10,000 years ago, with the latest activity near the Pleistocene-Holocene boundary. As some of the youngest volcanic activity north of Mount Lassen, Tumble Buttes clearly preserves the region’s fault-controlled volcanism.
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Old Station, California · United States
