Northern Oregon Coast Range

Northern Oregon Coast Range

Northern Oregon Coast Range

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Description:
The Northern Oregon Coast Range is the northern section of the Oregon Coast Range, in the Pacific Coast Ranges physiographic region, located in the northwest portion of the state of Oregon, United States. This section of the mountain range, part of the Pacific Coast Ranges, contains peaks as high as for Rogers Peak. The Central Oregon Coast Range is directly south of this section with the Southern Oregon Coast Range beyond the central range.

Geology

The origins of these mountains began approximately 40 million years ago during the Eocene age. During this time-period, sandstone and siltstone formed in the area. Additionally, igneous rocks and basalt flows combined with basaltic sandstone to create many of the mountainous formations. Other sedimentary rock in the area formed more recently, around 20 million years ago. It is hypothesized that portions of the northern section of the range were islands during parts of the Eocene era.An Erosional Classification for the Northern Oregon Coast, Annals of the Association of American Geographers,...
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