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Mayacmas Mountains

Ecoregion in Coast Ranges, CA

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The Mayacmas Mountains ecoregion is an interior coastal range that contrasts with the Ukiah/Russian River Valleys (6l) to the west and Clear Lake Hills and Valleys (6i) to the east. The mountains rise to more than 3,900 feet in elevation. The geology is a continuation of the Cretaceous and Jurassic Franciscan Complex sedimentary and metasedimentary rocks found in Ecoregion 78m to the north, along with some Mesozoic metavolcanics. Soil temperature regimes are thermic and soil moisture regimes are xeric. Annual grasslands and montane hardwoods are at low elevations, with mixed chaparral higher on the hills. Some blue oak woodland occurs, as well as patches of Sargent or McNab cypress. Scattered Douglas-fir grows in more mesic areas.

— EPA

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