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Roadside Geology of Mount St. Helens National Volcanic Monument and Vicinity
Roadside Geology of Mount St Helens National Volcanic Monument and Vicinity Author:Patrick T. Pringle Washington Department of Natural Resources Division of Geology and Earth Resources Information Circular 88 — This guidebook is largely a compilation of research by many investigators who for decades have been examining the geologic history, structure, and processes of the Mount St. Helens area. — Much of the eruptive history of Mount St. Helens ha... more »s been taken from the reports of the USGS, including post-1980 erosion research on previously unstudied deposits. Examination of those those rocks combined with new understanding and technological advances has resulted in refinements of the eruptive history.
This road guide describes and interprets geologic features at diverse sites in the Mount St. Helens National Volcanic Monument and surrounding area. It complements other published natural history and geologic handbooks and can be used in conjunction with maps of the Monument available at the mount St. Helens Visitor Center.
Five aspects of Mount St. Helens geology are examined: (1) pre-Mount St. Helens rocks and their history, (2) glacial history and glacial deposits, (3) pre-1980 history and activity of Mount St. Helens volcano, (4) post-1980 eruptions and deposits, and (5) ongoing processes of erosion and landscape modification.« less