Lassen Peak. Other smaller craters younger than 50,000 years are also active. Brokeoff's remains are exposed to the southwest Mount Lassen in Shasta County, California. Sulphur Works, an area known for its sharp, putrid scent, is thought to be the center of the ancient volcano. The central vent of Brokeoff Volcano was located near modern Diamond Peak. After volcanism at Brokeoff ended, magmatism became more silicic and began migrating toward Lassen Peak's northern flank. The last 400,000 years have seen at least three known flows, parts of which are still on Raker Peak and Mount Conard. A subsequent explosive eruption ejected of material and created a large crater, which was soon covered by lava. Twelve lava domes were built throughout the area and the next period of eruptive activity began. Spanning 50,000 years it ejected to of material and was followed by a third period. At least twelve periods of activity have taken place since Brokeoff formed, consisting of activity including pyroclastic flows, pasty lavas, and additional lava domes. Among the vents built by this activity is Lassen Peak. Flora and fauna Near the trailhead at lower elevations, alder thickets are present, as well as incense cedar, red firs, and western white pine. At higher elevations, groups of mountain hemlock and lupines prevail. Eagles and hawks can be frequently noted on high crags, and squirrels and pika live about the mountain. Recreation Hiking is especially popular on the mountain during summer. The mountain trail lasts between four and six hours, spans , and offers "exceptional" views of Mount Diller, Lassen Peak, Chaos Crags, and Mount Conard. Due to the characteristically intermittent eruptions of active volcanoes such as Lassen Peak, there is some threat from the volcanoes of the LVNP. Dacitic explosive eruptions have taken place within the last 50,000 years at Lassen Peak, Chaos Crags, and Sunflower Flat, and effusive eruptions of basalt have occurred at Tumble Buttes, Hat Mountain, and Prospect Peak. Pyroclastic flows and lahars could easily occur near glaciated areas and in river valleys like Hat Creek Valley. In addition to the volcanic hazards that could possibly occur, one volcano did erupt in the 20th century in LVNP: (Lassen Peak). Lassen's eruptions (1914–21, though most activity occurred between 1914–17) were very small compared to the 1980 eruption of Mount St. Helens. See also List of highest points in California by county Notes References External links Brokeoff Mountain