Mass Soil Movements in the H. J. Andrews Experimental Forest

Excerpt from Mass Soil Movements in the H. J. Andrews Experimental Forest
Willamette National Forest. The area lies within the Western Cascades physiographic province and is pre dominantly mature topography with sharp ridges and steep slopes. Bed rock in the area is made up of pyro clastics (tuffs and breccias) and basic igneous rocks (basalt and andesite).
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