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Diablo Range
Ecoregion
in
Coast Ranges
,
CA
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The Diablo Range ecoregion includes mountains with rounded ridges and steep to moderately steep sides, along with narrow canyons and valleys. It is higher and wetter than Ecoregion 6aa to the east, and it has a different geology and vegetation mosaic compared to Ecoregions 6y and 6al to the west. The elevation ranges from about 600 feet near San Luis Reservoir to about 4,000–5,000 feet on the high elevation mountains, with a peak of 5,248 feet on San Benito Mountain. Ecoregion 6z is dominated by Cretaceous-Jurassic Franciscan sedimentary, minor volcanic, and metamorphic rocks that are intensely folded and faulted. Ultramafic rocks are widely scattered throughout the region. The hills along the San Andreas Fault also include some Paleocene marine, Miocene marine, Plio-Pleistocene nonmarine, and Quaternary stream terrace deposits. Soil temperature regimes are mostly thermic, but are mesic on north-facing slopes at high elevations. Soil moisture regimes are xeric. The natural plant communities include blue oak woodlands and savannas and, on shallow soils, chamise. Leather oak occurs on serpentine soils, as well as mixed chaparral shrublands. Sargent cypress occurs, but is sparse on serpentine soils. Some black oak and mixed conifers are on north-facing slopes at high elevations, and Jeffrey pine occurs on serpentine soils on San Benito Mountain. All but the larger streams are dry through most of the summer. Natural lakes are absent, but there are a few reservoirs in the area.
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