Most precipitation falls between the months of November and March in the form of rain. Precipitation ranges from 18 to 42 inches annually. Elevation ranges between 3 ft above sea level. Soil temperature regime is thermic and soil moisture regime is xeric. ![]() Various geologies occur in this region: metavolcanics, granodiorite, slate, marble, argillite, and quartzite, as well as ultramafic bands to a limited and localized extent. It also includes mesa formations from volcanic flows, where vernal pool habitats occur. This LRU (designated XI) is located on moderate to steep mountains and hills in the Sierra Nevada Foothills. Due to extreme latitudinal differences in MLRA 18, Land Resource Units (LRUs) were designated to group the MLRA into similar land units. Geology is rather complex in this region there were several volcanic flow and ashfall events, as well as tectonic uplift, during the past 25 million years that contributed to the current landscape. Most of the precipitation comes as rain average annual precipitation ranges from 18 to 40 inches in most of the area (precipitation generally increases with elevation and from south to north). Climate is distinctively Mediterranean (xeric soil moisture regime) with hot, dry summers, and relatively cool, wet winters. MLRA 18 includes rolling to steep dissected hills and low mountains, with several very steep river valleys. Major Land Resource Area (MLRA) 18, Sierra Nevada Foothills is located entirely in California and runs north to south adjacent to and down-slope of the Sierra Nevada Mountains (MLRA 22A). ![]() Major Land Resource Area (MLRA): 018X–Sierra Nevada Foothills
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