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USGS/Cascades Volcano Observatory, Vancouver, Washington

Mount Hood, Oregon
Notable Geologic Events Near Mount Hood, Oregon
-- In the Past 50,000 Years --


-- Excerpt from: Scott, Gardner, Sherrod, Tilling, Lanphere, and Conrey, 1997,
Geologic History of Mount Hood Volcano, Oregon -- A Field-Trip Guidebook: U.S. Geological Survey Open-File Report 97-263, p.7.
Date or Age Event Deposits
A.D. 1859, 1865, 1907? Minor explosive eruptions of Mount Hood Scattered pumice
late 19th century Late neoglacial advance Prominent, sharp-crested moraines
late 18th century Old Maid eruptive period Lava dome, pyroclastic-flow and lahar deposits, tephra
about 500 years ago Debris flows in Zigzag River Debris-flow deposits
1,000 years ago Debris flows in upper Sandy River Debris-flow deposits
1,500 years ago Timberline eruptive period Lava dome, pyroclastic-flow and lahar deposits, tephra
7,700 years ago Eruptions from vent near Parkdale; Mount Mazama ashfall Basaltic andesite of Parkdale lava flow; about 5 centimeters of Mazama ash
11-20,000 years ago Waning phases of Evans Creek glaciation Moraines
13-20,000 years ago Polallie eruptive period Lava domes, pyroclastic-flow and lahar deposits, tephra
20-25,000 years ago Maximum of Evans Creek glaciation Belts of moraines in most valleys
20-30,000 years ago Mount Hood dome eruptions Lava domes, pyroclastic-flow and lahar deposits
30(?)-50,000(?) years ago Mount Hood lava-flow eruptions Andesite lava flows of Cathedral Ridge and Tamanawas Falls

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08/20/04, Lyn Topinka