Carving Out The Landscape
"The Columbia River shaped the Gorge as a physical place by carving through successive uplifts and volcanic outflows beginning about three million years ago and reaching something like its basic form about a million years ago. Raging floods of glacial meltwater known as the Missoula Floods further shaped the landscape, repeatedly crashing through the Gorge between 19,000 and 15,000 years ago. They stripped away loose talus and soil to shape its present landforms, creating landslide hazards from undercut slopes on the Washington side and turning mountain streams into hanging waterfalls on the Oregon side."
www.oregonencyclopedia.org/articles/columbia-river-gorge/....
Carving Out The Landscape
"The Columbia River shaped the Gorge as a physical place by carving through successive uplifts and volcanic outflows beginning about three million years ago and reaching something like its basic form about a million years ago. Raging floods of glacial meltwater known as the Missoula Floods further shaped the landscape, repeatedly crashing through the Gorge between 19,000 and 15,000 years ago. They stripped away loose talus and soil to shape its present landforms, creating landslide hazards from undercut slopes on the Washington side and turning mountain streams into hanging waterfalls on the Oregon side."
www.oregonencyclopedia.org/articles/columbia-river-gorge/....