![]() Stream channels cut across the grain of the nearly vertically oriented metamorphic Sierra Nevada rocks. CA-05 | Butte Area, Parts of Butte and Plumas Counties - 2006īlock diagram 4.-This diagram shows the topographic difference between some of the volcanic Cascade and metamorphic Sierra Nevada landforms.The area of alluvium shown near the bottom of the diagram is a bar of sediment deposited in the flatter volcanic reach below the steeper metamorphic reach (Soil Survey of Butte Area, California, Parts of Butte and Plumas Counties 2006). Subsequent geologic erosion has cut away the original plain of volcanic rocks and has left remnants surrounded by steep canyons. Volcanic flows moved down the canyon of the West Branch of the Feather River, burying Sierra Nevada rocks, and partially filled the canyon, forming a volcanic plain. CA-04 | Butte Area, Parts of Butte and Plumas Counties - 2006īlock diagram 3.-This diagram shows the interface of the Northern Sierra Nevada and Southern Cascade Mountains.Note that these diagrams may be from multiple survey areas. Click a link below to display the diagram.
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