Basalt Columns - Lewiston, ID - Glacial Lake Missoula Flood Features on Waymarking.com

The basalt is along the shore of the Snake River and is probably part of the Columbia River Basalt Group.

"During the middle to late Miocene epoch, the Columbia River flood basalts engulfed about 163,700 km2 (63,200 sq mi) of the Pacific Northwest, forming a large igneous province with an estimated volume of 174,300 km3 (41,800 cu mi). Eruptions were most vigorous from 17–14 million years ago, when over 99 percent of the basalt was released. Less extensive eruptions continued from 14–6 million years ago.

Erosion resulting from the Missoula Floods has extensively exposed these lava flows, laying bare many layers of the basalt flows at Wallula Gap, the lower Palouse River, the Columbia River Gorge and throughout the Channeled Scablands." (visit link)

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Date Logged Log User Rating   02/10/2022 Benchmark Blasterz visited it 01/23/2021 ptowngirl229 visited it

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