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Paso Robles Hills and Valleys
Ecoregion
in
Coast Ranges
,
CA
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The Paso Robles Hills and Valleys ecoregion is a dissected plain with low, rolling to moderately steep hills. It is lower, drier, and has less relief than the adjacent Ecoregions 6ai and 6al. The rolling hills are underlain by Plio-Pleistocene nonmarine sediments, with areas of Quaternary alluvium on the flatter plains. Some small areas of Miocene and Pliocene marine sediments occur. The soil temperature regime is thermic and soil moisture regime is xeric. Common vegetation includes blue oak savannas and annual grasslands. Some valley oak occurs on deep soils and a few small areas of chamise chaparral are found on shallow or dry soils. Ranching and livestock grazing is a dominant land use, with some pasture, hay, and cropland in the valleys. Grape vineyards have become more extensive in the ecoregion.
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