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Topo

Ecoregions

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Mid-Coastal Sedimentary

Ecoregion in Coast Ranges, OR

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The mountainous Mid-Coastal Sedimentary ecoregion lies outside of the coastal fog zone and is typically underlain by massive beds of sandstone and siltstone in contrast to the volcanics of Ecoregion 1d. Ecoregion 1g is more rugged than the geologically similar Willapa Hills (1f). Its Douglas-fir forests are intensively managed for logging. Slopes are prone to failure when disturbed, particularly south of the Siuslaw River. Stream sedimentation is higher than in the Volcanics ecoregion.

— EPA

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