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The Kulshan caldera is a Pleistocene volcano in the North Cascades of Washington and one of the few calderas identified in the entire Cascade Range. [ 1 ] [ 2 ] It is the product of the Mount Baker volcanic field , which has a history stretching back to possibly 3.722 million years ago.
Hannegan caldera is a 3.72 million year old volcanic collapse structure in the North Cascades of the U.S. state of Washington. [2] The caldera collapsed during two separate volcanic eruptions that produced as much as 140 km 3 of rhyolite ash.
Calderas of Washington (state) (3 P) Calderas of Wyoming (1 C, 2 P) Pages in category "Calderas of the United States" The following 3 pages are in this category, out ...
Volcanic calderas of Washington state, United States. Pages in category "Calderas of Washington (state)" The following 3 pages are in this category, out of 3 total.
Although Mount St. Helens is in Skamania County, Washington, access routes to the mountain run through Cowlitz County to the west, and Lewis County to the north. State Route 504, locally known as the Spirit Lake Memorial Highway, connects with Interstate 5 at Exit 49, 34 miles (55 km) to the west of the mountain.
Calderas of Washington (state) (3 P) G. Goat Rocks (1 C, 10 P) R. Mount Rainier (3 C, 28 P) S. Mount St. Helens (1 C, 18 P) Stratovolcanoes of Washington (12 P)
But unlike mammoth mountains like Washington state’s Mount St. Helens or Oregon’s Mount Hood and Mount Jefferson, ... Its caldera at the top is a few miles wide and long, and about 300 feet ...
It started near Soap Lake in Washington State, where less resistant basalt layers gave way before the great erosive power of this tremendous torrent and waterfalls developed. As in the upper Grand Coulee, the raging river yanked chunks of rock from the face of the falls and the falls eventually retreated to their present location.