LOCATION PABLO CA MTEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, isomesic Lithic Haplustolls
TYPICAL PEDON: Pablo loam - on a north facing convex slope of 20 percent under coyotebrush, poisonoak, blackberry, brackenfern,wildiris, soft chess, and ryegrass at elevation of 500 feet. (Colors are for dry soil unless otherwise stated. When described (12/6/76) the soil was moist throughout.)
All--O to 3 inches; dark gray (10YR 4/1) loam, black (10YR 2/1) moist; moderate very fine granular and weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, few coarse roots; many very fine tubular and interstitial pores; slightly acid (pH 6.5); clear smooth boundary. (2 to 5 inches thick)
A12--3 to 6 inches; dark gray (10YR 4/1) loam, black (10YR 2/1) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, few fine roots; many very fine tubular and interstitial pores; moderately acid (pH 6.0); gradual smooth boundary. (3 to 6 inches thick)
A13--6 to 15 inches; dark gray (10YR 4/1) loam, black (10YR 2/1) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, few fine roots; many very fine tubular and interstitial pores; moderately acid (pH 6.0); abrupt irregular boundary. (5 to 9 inches thick)
R--15 inches; hard highly fractured siliceous shale.
TYPE LOCATION: Marin County, California; located about 0.7 miles west on Limantour Road from Bayview Trailhead, about 75 feet north of Limantour Road, in the Point Reyes National Seashore.
RANGE IN CHARACTERISTICS: Depth to a lithic contact is 10 to 20 inches. The mean annual soil temperature is 52u to 57" F. The difference between mean winter and mean summer temperature is 5 to 99 F. The soil moisture control section is moist from mid-November to June. It is dry in some or all parts the rest of the time but is not dry in all parts for 45 consecutive days. Siliceous rock fragments, mostly gravel, make up to 15 percent of the soil. Organic matter is more than 1 percent throughout the solum. The soil is medium acid or slightly acid and commonly becomes more acid with increasing depth. Base saturation is 50 to 75 percent throughout the solum.
The A horizon has dry color of IOYR 4/1, 4/2, 5/1 or 5/2 and moist color of 10YR 3/1, 3/2, 2/1 or 2/2. It is loam or clay loam and has granular or subangular blocky structure. Some horizons have a thin B2 or C horizon between the A horizon and the bedrock.
COMPETING SERIES: This is the Bayview series in another family. Bayview soils have a loamy-skeletal control section.
GEOGRAPHIC SETTING: Pablo soils are on hills. Slopes are 9 to 75 percent. The soils formed in material weathered from siliceous and shale of the Monterey formation. Elevations are 100 to 700 feet. The climate is subhumid mesothermal with cool foggy summers and cool moist winters. Mean annual precipitation is 25 to 35 inches. January temperature is about 52 F.; mean July temperature is about 55 F.; mean annual temperature is about 52 to 57 F. Frost-free season is about 300 to 365 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Inverness soils and the competing Bayview soils. Inverness soils are 40 to 60 inches deep to a paralithic contact and have a fine-loamy argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; moderate permeability.
USE AND VEGETATION: The soil is used for rangeland, recreation, wildlife habitat and watershed. Natural vegetation is coastal shrubs, blackberry, bracken fern, annual grasses, and forbs.
DISTRIBUTION AND EXTENT: Hilly areas of central coastal California. The soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Marin County, California, 1979.