The Coastal Ranges of Washington and Oregon

Yao Yao and Tyler Szwarc http://upload.wikimedia.org/wikipedia/commons/3/3d/Northern_Oregon_Coast.jpg

• Part of the Pacific Coast Ranges• Three Geographic Areas: Olympic Mountains,

Willapa Hills, Oregon Coast Ranges

• Precipitation 60-240 inches • Temperature 32F-53F

Depth (km)

Structure VP-Wave (km/s)

1-3 Near Surface Crust

2.9-5.2

3-30 Upper/Middle Crust

6.1-6.5

30-45 Lower Crust 7

45 Moho

Physical Characteristics• Elevation ranges from sea level to 1248 m (Marys

Peak)• Average elevation is 460 m• Bedrock geology primarily consists of pillow lavas

and basalt flows

http://www.pmel.noaa.gov/vents/laubasin/images/pillow_lava1-lores.jpg

http://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/OregonCoastRangeRocks.JPG/800px-OregonCoastRangeRocks.JPG

Late Cretaceous (66 Ma)

Late Eocene (36 Ma)

Present Day

Pillow Lavas (Purple)Basalt (Red)

500 km

500 km

500 km

North

North

North

South

South

South