The Palouse Loess of southeastern Washington was deposited on a gently undulating surface of Columbia River Basalt. Resistivity measurements indicate that the loess attains thicknesses in excess of 250 ft in the southwestern Palouse, but thins to less than 100 ft in the northeast. The low, rolling hills of the northeastern Palouse are formed in the areas of thin loess deposited on an almost horizontal basalt surface. The high, steep hills that typify the western and southwestern Palouse are associated with 200 ft or more of loess deposited on a more steeply inclined basalt surface.

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