![]() ![]() Structure: Massive, may be weak subangular blocky in some pedons.Ĭonsistence: Soft or slightly hard dry, nonsticky or slightly sticky and nonplastic or slightly plastic wet. Texture: Stratified stony sand to extremely gravelly loam, averaging very gravelly sandy loam. Value: 4 or 5 dry some pedons have thin subhorizons formed in eolian materials with dry value of 6 or 7. Rock fragments: Averages 35 to 60 percent. Particle-size control section - Clay content: Averages 10 to 15 percent. Mean annual soil temperature: 9 to 12 degrees C. Soil moisture: Usually moist in the moisture control section in winter and spring, dry in summer and fall aridic soil moisture regime that borders on xeric. USGS Genoa 7.5 minute topographic quadrangle latitude 39 degrees 03 minutes 15.5 seconds N and longitude 119 degrees 48 minutes 38 seconds W NAD 83. TYPE LOCATION: Douglas County, Nevada approximately 1,000 feet west and 520 feet south of the northeast corner of section 26, T. (20 to 36 cm thick)Ĭ-38 to 155 cm light brownish gray (10YR 6/2) very gravelly sandy loam, dark grayish brown (10YR 4/2) moist massive slightly hard, very friable, slightly sticky and nonplastic common very fine and fine roots at the top of the horizon, and few fine roots near the bottom many very fine and many fine tubular pores many mica grains evident 40 percent gravel, 5 percent cobbles, and 2 percent stones neutral (pH 6.6). (5 to 15 cm thick)Ī2-10 to 38 cm gray (10YR 5/1) cobbly loam, very dark grayish brown (10YR 3/2) moist weak thin platy structure parting to weak fine subangular blocky slightly hard, friable, slightly sticky and nonplastic many very fine and few fine roots many very fine and many fine tubular pores many mica grains evident 15 percent gravel and 15 percent cobbles neutral (pH 7.1) clear wavy boundary. (Colors are for dry soil unless otherwise noted.)Ī1-0 to 10 cm gray (10YR 5/1) very cobbly fine sandy loam, very dark grayish brown (10YR 3/2) moist weak thin platy structure parting to weak very fine granular soft, very friable, slightly sticky and nonplastic many very fine and fine, and few medium roots many very fine and fine tubular pores many mica grains evident 20 percent gravel, 10 percent cobbles, and 5 percent stones neutral (pH 7.0) clear smooth boundary. TYPICAL PEDON: Holbrook very cobbly fine sandy loam-rangeland. TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Torriorthentic Haploxerolls The mean annual precipitation is about 250 mm and the mean annual temperature is about 9 degrees C. Holbrook soils are on alluvial fans, fan aprons and inset fans. The Holbrook series consists of very deep, well drained soils that formed in alluvium derived from mixed rocks. Official Series Description - HOLBROOK Series ![]()
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