There are a total of ten different landscape regions located within the Pacific Northwest. The rocks that are within each region provide the foundation for the landscape within the region. The study of the rock located in the region tells us about the geologic past and provides insight on the materials and processes from which the landscape was formed. I will briefly discuss each of the areas and provide insight on the types of rocks in which they are formed from. We will start with the Basin and Range which is an elongate mountain range that is separated by elongate valleys. This area was formed by alluvial fan which is a cone-shaped fan of sediment deposited by streams and fault-block mountain. The Blue-Wallowa Mountains is located from
