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These plumes are much more focused than the upwelling observed with large-scale plate-tectonics circulation.

The hot spot hypothesis is not universally accepted as it has not resolved several questions.

Prior to 17.5 million years ago, the Western Cascade Stratovolcanoes erupted with periodic regularity for over 20 million years, even as they do today.

An abrupt transition to shield volcanic flooding took place in the mid-Miocene.

As the molten rock came to the surface, the Earth's crust gradually sank into the space left by the rising lava.

This subsidence of the crust produced a large, slightly depressed lava plain now known as the Columbia Basin or Columbia River Plateau.

There is additional confirmation that Yellowstone is associated with a deep hot spot.

The ultimate cause of the volcanism is still up for debate, but the most widely accepted idea is that the mantle plume or upwelling (similar to that associated with present-day Hawaii) initiated the widespread and voluminous basaltic volcanism about 17 million years ago. states of Washington, Oregon, Idaho, Nevada, and California.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.The northwesterly advancing lava forced the ancient Columbia River into its present course.The lava, as it flowed over the area, first filled the stream valleys, forming dams that in turn caused impoundments or lakes.Ho and Cashman (1997) characterized the 500 km (310 mi)-long Ginkgo flow of the Columbia River Basalt Group, determining that it had been formed in roughly a week, based on the measured melting temperature along the flow from the origin to the most distant point of the flow, combined with hydraulics considerations.