palouse falls - Michael Knutson (11040656) Pritchard/Wulf 4...

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Michael Knutson (11040656) Pritchard/Wulf 4 March 2009 Geology 101 Lab Sec . 27 Palouse Falls Geologic Features The Palouse Falls is part of a rock group known as the Columbia River Basalt Group . This large mass of basalt rock has been created over time beginning over 20 million years ago . Between 17 and 14 million years ago, vigorous eruptions occurred along the cascade mountain range . Lava flowed throughout the Northwest and as it cooled, it formed massive igneous rock bodies . These igneous rock bodies make up most of the geologic features found between Eastern Washington and Idaho, along the Columbia River . The Palouse Falls itself, was created during the last ice age when a build up of ice sheets of up to 10,000 feet in thickness began to melt . As the ice turned to water, the largest freshwater flood ever to exist on Earth swept throughout the Pacific Northwest . While some of the water headed East, most of it was sent West, down the Columbia River Bed . Streams moving up to 90 miles per hour and nearly
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palouse falls - Michael Knutson (11040656) Pritchard/Wulf 4...

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