Abstract
Land Resource Region (LRR) A is located in the Pacific Northwest of the United States and is dominated by four major mountain ranges (Cascades, Klamath, Coast Range and the Olympics) and two main coastal areas (Puget Sound and Pacific Coast). The Region includes two large valley systems (Willamette Valley and the Puget Lowland) and the adjoining eastern and western mountain foot slopes. The region covers over 234,000 km2. It includes a rich agricultural area due to a mild coastal climate, deep soils formed in alluvium and adequate precipitation for crops. The parent material of the Cascade Mountains is mainly volcanic tephra and residuum, the valleys are primarily mixed alluvial sediments, and the parent materials of the Coast Range, Klamath and Olympic Mountains are mixtures of alluvium, residuum and colluvium derived from sedimentary rocks that are uplifted sea floors and volcanic rocks. Elevations range from sea level to over 4,400 meters in the Cascade Mountains.
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