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Calapooya Mountains
The Calapooya Mountains are a mountain range in Lane and Douglas counties of southwestern Oregon in the United States. The range runs for approximately west from the Cascade Range between Eugene on the north and Roseburg on the south.
== Geology ==
The Calapooya Mountains are composed of volcanic rocks and newer sedimentary strata. The mountains have been deeply eroded by the Coast Fork Willamette River and its tributaries. In the southern drainage, the tributaries of the North Umpqua River have cut into the southern slopes. The soil is silty, clay loam formed from sandstone, sediment, and igneous rocks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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