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Antediluvian Curvilinear Basalt Grooves

View on map:47.510727°N 119.488607°W

Comments

"Near Lake Lenore, these curvilinear grooves are cooling features in a Columbia River Basalt flow that is more than 15 million years old, long before the Pleistocene  Megafloods. The grooves are now exposed due to the floods stripping away the overlying sediment and rocks." (see reference)

Description


Columbia Plateau

The Columbia Plateau is a geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho. It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains, cut through by the Columbia River.

References

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