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Filters Date Range Past year (1) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Shapefile (1) Types Map Service (1) OGC WFS Layer (1) OGC WMS Layer (1) Shapefile (1) Contacts Charles M Cannon Geology, Minerals, Energy, and Geophysics Science Center U.S. Geological Survey Russell C Evarts U.S. Geological Survey - ScienceBase Core Science Systems Categories Data (1) Tag Types Theme (5) Tags (with Scheme=American Geological Institute Glossary of Geology) hyaloclastite (1) palagonite (1) paleochannel (1) sideromelane (1) tholeiitic basalt (1) View Results as: JSON ATOM CSV

Extent of Pliocene hyaloclastic deposits and related lava flows in the Columbia Gorge, Oregon and Washington This dataset contains polygons representing deposits of hyaloclastic debris that were generated between about 3.5 and 3.0 million years ago when a series of basaltic lava flows entered the canyon of the ancestral Columbia River. The lava flows were erupted from volcanoes in the area of the Hood River graben of McClaughry and others (2012), generally have low-potassium tholeiitic basalt composition, and were part of a widespread pulse of mafic volcanism in the northern Oregon Cascade Range that occurred between about 4.4 and 2.1 million years ago (Conrey and others, 1996). Lava flows that entered the ancestral Columbia River were rapidly chilled and fragmented during interaction with water (Trimble, 1963, Swanson,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Clark County, Columbia Gorge, Columbia River, Columbia River Gorge National Scenic Area, Hood River, All tags... Hood River County, Multnomah, Multnomah County, Oregon, Oregon, Pacific Northwest, Stratigraphy, USGS Science Data Catalog (SDC), Volcanology, Washington, Washington, geologic maps, geology, geoscientificInformation, hyaloclastite, palagonite, paleochannel, sedimentary rocks, sideromelane, tholeiitic basalt, volcanic rocks, Fewer tags