User:Yurikcm/Brushy Butte

Brushy Butte is a small, poorly studied, shield volcano located immediately east of Timbered Crater, south-southeast of the Medicine Lake Highlands in northern California, U.S. (near where Siskiyou County, California is adjacent to Shasta County, California).Brushy Butte forms a small shield complex immediately east of Timbered Crater, SSE 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 Falls River valley. Soil development and degree of revegetation suggested a Holocene age similar to that of Hat Creek flow to the south (Peterson and Martin, 1980), and Miller (1989) also mapped Brushy Butte as Holocene. The Hat Creek flow, however, has been dated at 24,000 +/- 6000 years (Clynne and Muffler, 2010). Brushy Butte flows are overlain by the Giant Crater lava flow from Medicine Lake caldera, which has a calibrated age of 12,430 yrs BP (Donnelly-Nolan, 2010), and Brushy Butte is considered to have formed between about 12,000 and 25,000 years ago (Smith, 2014 pers. comm.).

The last known eruption for the Brushy Butte was in the Pleistocene age, the volcanic landforms within the volcano indicates that this flow field erupted over 10-20 years. There is not current information of any Holocene eruptions from Brushy Butte. Brushy Butte is considered to have formed between about 12,000 and 25,000 years ago.

Brushy Butte is a small, poorly studied, shield volcano located immediately east of Timbered Crater, south-southeast of the Medicine Lake Highlands in northern California, U.S. (near where Siskiyou County, California is adjacent to Shasta County, California). This volcano is considered to have formed soil development and degree of revegetation similar to that of Hat Creek flow. There is not current information of any Holocene eruptions from Brushy Butte, the last known eruption for the Brushy Butte was in the Pleistocene age, and the eruption was considered to be over 10-20 years, this was found based on the different lava flow landforms created and their placement around the interior of the volcano.. Brushy Butte is located in a rifting area and the type of magma that erupted is called tholeiitic basalt; a type of lava that is dark and it contains 45 to 53 percent of silica, rich in iron and magnesium.