LOCATION HANNAROCKS CA
Established Series
PBF/RLR/JTW
01/2020
HANNAROCKS SERIES
The Hannarocks series consists of moderately deep, well drained soils that formed in colluvium and residuum from granitic sources. Hannarocks soils are on mountain slopes. Slopes range from 15 to 50 percent. The mean annual precipitation is about 750 millimeters and the mean annual air temperature is about 8.5 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Pachic Haploxerolls
TYPICAL PEDON: Hannarocks extremely cobbly loam, on an east facing, linear, 38 percent slope under Jeffrey pine, white fir, California black oak, and annual grasses at an elevation of 2,341 meters. (Colors are for dry soil unless otherwise noted.) The surface is covered by approximately 10 percent gravel, 35 percent cobbles and 5 percent stones.
A -- 0 to 30 centimeters; dark grayish brown (10YR 4/2) extremely cobbly loam, very dark brown (10YR 2/2) moist; weak very fine subangular blocky structure; moderately hard, firm, slightly sticky and plastic; common very fine and fine roots throughout; 30 percent gravel, 35 percent cobbles and 5 percent stones; slightly acid (pH 6.2); gradual smooth boundary. (15 to 35 centimeters)
Bw1 -- 30 to 61 centimeters; dark grayish brown (10YR 4/2) extremely cobbly loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; moderately hard, firm, slightly sticky and plastic; common very fine and fine roots throughout; 30 percent gravel, 35 percent cobbles and 5 percent stones; neutral (pH 6.6); gradual smooth boundary.
Bw2 -- 61 to 97 centimeters; dark grayish brown (2.5Y 4/2) extremely cobbly loam, very dark grayish brown (2.5Y 3/2) moist; weak fine subangular blocky structure; moderately hard, firm, slightly sticky and plastic; common very fine and fine roots throughout; 30 percent gravel, 35 percent cobbles and 5 percent stones; moderately acid (pH 6.0); clear wavy boundary. (Combined thickness of the Bw horizon is 15 to 85 centimeters)
Crt -- 97 to 104 centimeters; moderately cemented granitoid rock; common fine roots in cracks; 3 percent patchy distinct clay films on rock faces; moderately acid (pH 5.6).
TYPE LOCATION: San Bernardino County, California; 175 meters west and 265 meters north of the SW corner of section 1, T. 2 N., R. 1 W. San Bernardino Base and Meridian; 34.2821667 degrees latitude, -116.9418056 degrees longitude, WGS84; UTM Zone 11, 0505357e, 3793444n; U.S.G.S. Quad: Fawnskin, California.
RANGE IN CHARACTERISTICS:
Soil temperature: 8 to 12 degrees C.
Soil moisture control section: Usually dry in all parts from late May or early June until late November or early December, and usually moist in some or all parts the rest of the year.
Organic matter: 1 to 3 percent
Surface rock fragments: 30 to 65 percent; with 10 to 25 percent gravel, 10 to 40 percent cobbles and 0 to 10 percent stones
Depth to paralithic contact: 50 to 100 centimeters
Control section
Thickness of the mollic epipedon: 50 or more centimeters
Rock fragments: 40 to 80 percent gravel, cobbles and stones
Clay content: averages 15 to 25 percent
A horizon
Dry color: 10YR 3/2, 3/3, 4/2, 4/3
Moist color: 10YR 2/2, 3/2, 3/3
Texture: very to extremely cobbly loam sandy loam, or sandy clay loam
Clay content: 15 to 25 percent
Rock fragments: 40 to 80 percent; with 20 to 40 percent gravel, 20 to 40 percent cobbles and 0 to 5 percent stones
Reaction: moderately or slightly acid
Bw horizons
Dry color: 10YR or 2.5Y 3/2, 3/3, 4/2, 4/3, 5/3, 6/3
Moist color: 10YR or 2.5Y 3/2, 3/3, 4/2, 4/3, 5/3
Texture: very to extremely cobbly loam, sandy loam, sandy clay loam
Clay content: 15 to 25 percent
Rock fragments: 40 to 80 percent; with 20 to 40 percent gravel, 20 to 40 percent cobbles and 0 to 5 percent stones
Reaction: moderately or slightly acid
COMPETING SERIES:
Dehlinger soils: have clay loam textures in the B horizon and are formed in colluvium or alluvium from basalt, andesite, tuff or a combination of them.
Demox soils: have less than 18 percent clay throughout and are formed in colluvium or alluvium from basalt, andesite, tuff or a combination of them.
Doble soils: formed in mixed alluvium with less than 16 percent clay.
Drit soils: do not have a paralithic contact.
Gamboa soil: 100 to 150 centimeters to a lithic contact.
Goldmountain: have a lithic contact of metasedimentary rock from 50 to 100 centimeters.
Langrell soils: formed in glaciofluvial deposits.
Murken soils: have soil colors with a hue of 7.5YR or 5YR and are formed in colluvium and eolian deposits from basalt, andesite, tuff or a combination of them.
Packard soils: do not have a paralithic contact and are formed in alluvium.
Plumas soils: dry in all parts for about 60 days and are formed in alluvium from metasedimentary rocks.
Raster soils: have 45 to 70 percent stones and cobbles in the subsurface and are formed in colluvium or alluvium from volcanic rocks.
Watterson soils: have less than 15 percent rock fragments in the upper part of the A horizon, have mean annual precipitation of 254 to 457 millimeters and are formed in mixed alluvium with an influence of volcanic ash
Wrentham soils: have silt loam or silty clay loam textures in the Bw horizon.
GEOGRAPHIC SETTING:
Landscape: mountains
Landform: mountain slopes
Slopes: 15 to 50 percent
Parent material: mixed residuum and colluvium from granitic sources
Elevations: range from 2,125 to 2,550 meters
Climate: subhumid mesothermal with warm, dry summers and cool, moist winters with some snow
Mean annual precipitation: 600 to 900 millimeters
Mean annual air temperature: is 8 to 10 degrees C.
Frost-free season: 85 to 150 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Groutcreek soils: 25 to 50 cm to a lithic contact are on mountain slopes.
Cedarpines soils: weighted average of less than 35 percent rock fragments in the particle-size control section and are on similar landscape positions.
Runningsprings soils: less than 50 centimeters to a paralithic contact and are on similar positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderate saturated hydraulic conductivity.
USE AND VEGETATION: Hannarocks soils are used for recreation, watershed and wildlife habitat. Some areas are used for homesites. The present vegetation is mainly Jeffrey pine, white fir, California black oak, and annual grasses.
DISTRIBUTION AND EXTENT: Inland mountain ranges of Southern California Coastal Plains and Mountains, MLRA 19. These soils are of small extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: San Bernardino Mountains, San Bernardino County, California, 2004.
REMARKS: Diagnostic horizons and features recognized in the pedon are:
Mollic epipedon: the zone 0 to 61 centimeters (A and Bw1 horizons)
Cambic horizon: the zone from 30 to 97 centimeters (Bw1 and Bw2 horizons)
Paralithic contact: 97 centimeters (Cr horizon)
Particle-size control section: the zone from 25 to 97 centimeters
The name is from a location in the soil survey area.
ADDITIONAL DATA:
User Site ID: 2004CA071044
User Pedon ID: ca777-6874-67-L
Classified using the Twelfth Edition of Soil Taxonomy (2014)
National Cooperative Soil Survey
U.S.A.