1980 eruption of Mount St. Helens. Other eruptions Silverthrone Caldera Most of the Silverthrone Caldera's eruptions in the Pacific Range occurred during the Last Glacial Period and was episodically active during both Pemberton and Garibaldi Volcanic Belt stages of volcanism. The caldera is one of the largest of the few calderas in western Canada, measuring about long (north-south) and wide (east-west). The last eruption from Mount Silverthrone ran up against ice in Chernaud Creek. The lava was dammed by the ice and made a cliff with a waterfall up against it. The most recent activity was 1000 years ago. Mount Garibaldi Mount Garibaldi in the Pacific Range was last active about 10,700 to 9,300 years ago from a cinder cone called Opal Cone. It produced a long broad dacite lava flow with prominent wrinkled ridges. The lava flow is unusually long for a silicic lava flow. Mount Baker During the mid-19th century, Mount Baker erupted for the first time in several thousand years. Fumarole activity remains in Sherman Crater, just south of the volcano's summit, became more intense in 1975 and is still energetic. However, an eruption is not expected in the near future. Glacier Peak Glacier Peak last erupted about 200–300 years ago and has erupted about six times in the past 4,000 years. Mount Rainier Mount Rainier last erupted between 1824 and 1854, but many eyewitnesses reported eruptive activity in 1858, 1870, 1879, 1882, and in 1894 as well. Mount Rainier has created at least four eruptions and many lahars in the past 4,000 years. Mount Adams Mount Adams was last active about 1,000 years ago and has created few eruptions during the past several thousand years, resulting in several major lava flows, the most notable being the A. G. Aiken Lava Bed, the Muddy Fork Lava Flows, and the Takh Takh Lava Flow. One of the most recent flows issued from South Butte created the long by wide A.G. Aiken Lava Bed. Thermal anomalies (hot spots) and gas emissions (including hydrogen sulfide) have occurred especially on the summit plateau since the Great Slide of 1921. Mount Hood Mount Hood was last active about 200 years ago, creating pyroclastic flows, lahars, and a well-known lava dome close to its peak called Crater Rock. Between 1856 and 1865, a sequence of steam explosions took place at Mount Hood. Newberry Volcano A great deal of volcanic activity has occurred at