Brushy Butte forms a small shield complex immediately east of Timbered Crater, south-southeast of the Medicine Lake highlands. The Brushy Butte complex has produced a broad apron of basaltic lava
flows with fresh-looking flow features that extends preferentially down the regional gradient to the south as far as the Fall River valley. Soil development and revegetation suggested a Holocene
age similar to that of Hat Creek flow to the south. The Hat Creek flow, however, has been dated at 24,000 +/- 6000 years, and Brushy Butte and other young vents
between Medicine Lake and Lassen volcanoes could be of latest Pleistocene
or early Holocene age.
California, Shasta County
Most recent eruption:
Low/Very Low *