California Volcano[20 points]

Volcano is an unincorporated community in Amador County, California. The town sits at 2,200 feet above sea level and the current population is approximately 85. It is located at 38.4426° N 120.6316° W, just north of Pine Grove. The town is registered as California Historical Landmark #29.

Type: shield shaped volcano with caldera
Activity: dormant
Last Eruption: about 1000 yrs ago
Rock Type: basalt to rhyolite

A series of young eruptions lasting a few hundred years began about 10,500 years before present (BP) and produced 5 cu km of basaltic lava. Eruptive activity resumed 6,000 years later, producing a chemically varied group of basaltic lava flows from flank vents and silicic obsidian flows from vents within the caldera and on the upper flanks. The last eruption produced the massive Glass Mountain obsidian flow on the east flank about 900 years BP. The volcano has produced a wide range of volcanic products from basaltic spatter cones to obsidian flows of rhyolitic composition.