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Lake Lewis
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Lake Lewis was a large transient lake in the Pacific Northwest region of North America, formed by periodic Missoula Floods along the Columbia River paleocourse between 21,000 and 16,000 years ago.
This figure shows four profiles of Lake Lewis at various flood levels. It illustrates that the lake back flooded several valleys in which the Touchet
This figure shows four profiles of Lake Lewis at various flood levels. It illustrates that the lake back flooded several valleys in which the Touchet Beds were found.
Looking to the West across the Wallula Gap.
Looking to the West across the Wallula Gap.
Touchet beds in the "Little Grand Canyon" near Lowden in the Walla Walla valley. Note distinct layers.
Touchet beds in the "Little Grand Canyon" near Lowden in the Walla Walla valley. Note distinct layers.
Cluster of erratics on Red Mountain shown in the foreground; these were trapped in glacial ice and "rafted in" on the flood of Lake Lewis. In the back
Cluster of erratics on Red Mountain shown in the foreground; these were trapped in glacial ice and "rafted in" on the flood of Lake Lewis. In the background the native basalt, which covers the rest of the mountain ridge, is visible.
Glacial erratic
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A glacial erratic is a glacially deposited rock differing from the type of rock native to the area in which it rests. Erratics, which take their name from the Latin word errare, are carried by glacial
Lake Lewis
…Formation layers which are found throughout these valleys. The maximum elevation of the flood, as established by other indications, is confirmed by glacial erratics, which were stranded on the slopes of the Horse Heaven Hills and other elevated regions in the mid-Columbia at elevations of up to 1,200 feet (370 m…
Glacial erratics from Norway on Schokland in the Netherlands
Glacial erratics from Norway on Schokland in the Netherlands
Glacial erratic boulder in Snowdonia (Eryri), Wales
Glacial erratic boulder in Snowdonia (Eryri), Wales
Multiple erratics on the terminal moraine of the Okanogan Lobe. The Cascade Mountains are in the background.
Multiple erratics on the terminal moraine of the Okanogan Lobe. The Cascade Mountains are in the background.
Doane Rock, at Cape Cod National Seashore
Doane Rock, at Cape Cod National Seashore