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North Coast Range Eastern Slopes

Ecoregion in Coast Ranges, CA

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The North Coast Range Eastern Slopes ecoregion is located along the steep, north-trending eastern edge of the Northern Coast Range mountains with sedimentary and ultramafic rocks. It has more relief and higher elevations than Ecoregion 6f to the east, with mostly chaparral vegetation compared to the grassland and blue oak to the east. It has few conifers compared to the higher elevation Ecoregion 78r to the west. The disjunct southern unit of the region between Clear Lake and Lake Berryessa has a complex pattern of Mesozoic sedimentary, metasedimentary, metavolcanic, and ultramafic rocks. Elevations range from about 450 feet near Lake Berryessa to the high point 3,196-foot Brushy Skyhigh, and relief is mostly 500–1,200 feet. Vegetation includes leather oak on serpentine soils, chamise on other shallow soils, and mixed conifer on deeper, mesic soils. Some hills contain McNab or Sargent cypress or some foothill and knobcone pine. Areas of blue oak woodland occur in low elevation, flatter areas. All but the larger streams are dry through most of the summer. Soil temperature regimes are mostly thermic, but are mesic on some north-facing slopes and at high elevations. Soil moisture regimes are xeric.

— EPA

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