LOCATION PINNCAMP CAEstablished Series
TAXONOMIC CLASS: Mixed, thermic Psammentic Haploxerolls
TYPICAL PEDON: Pinncamp gravelly coarse sand under a canopy of live oak on a 1 percent slope at an elevation of 980 feet (300 meters) (Colors are for moist soil unless otherwise noted).
Oi--0 to 2 inches (0 to 5 centimeters); woody slightly decomposed plant material of oak leaves and twigs; abrupt smooth boundary.
Oe--2 to 4 inches (5 to 10 centimeters); peaty moderately decomposed plant material; neutral (pH 6.9); abrupt smooth boundary.
A1--4 to 12 inches (10 to 30 centimeters); grayish brown (10YR 5/2) gravelly coarse sand, very dark grayish brown (10YR 3/2) moist; moderate very coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common medium and fine roots; many fine irregular pores; 15 percent gravel; moderately acid (pH 5.8); clear wavy boundary.
A2--12 to 22 inches (30 to 56 centimeters); grayish brown (10YR 5/2) gravelly loamy coarse sand, dark grayish brown (10YR 4/2) moist; moderate coarse and very coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine through coarse roots; many fine irregular pores; 15 percent gravel; moderately acid (pH 6.0); clear wavy boundary.
A3--22 to 36 inches (56 to 91 centimeters); brown (10YR 5/3) loamy coarse sand, dark grayish brown (10YR 4/2) moist; moderate coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; many fine irregular pores; 10 percent gravel; slightly acid (pH 6.3); clear wavy boundary. (Combined thickness of the A horizons is 10 to 16 inches, 25 to 40 centimeters)
C--36 to 64 inches (91 to 162 centimeters); pale brown (10YR 6/3) loamy coarse sand, brown (10YR 5/3) moist; moderate medium subangular blocky structure; loose, loose, nonsticky and nonplastic; common fine roots; many fine irregular pores; 10 percent gravel, slightly acid (pH 6.2). (28 to 40 inches, 70 to 100 centimeters thick)
TYPE LOCATION: San Benito County, California; about 80 feet (25 meters) south of Highway 146 and fire lane leading to the South Wilderness Trail; 1,280 feet west and 2,500 feet south of the northeast corner of section 1, T 17S, R 7E; USGS North Chalone Peak, California topographic quadrangle; 36 degrees 28 minutes 52.20 seconds north latitude and 121 degrees 9 minutes 25.70 seconds west longitude; UTM 665077 meters E, 4038905 meters N, zone 10.
RANGE IN CHARACTERISTICS:
Depth to bedrock: over 60 inches (155 centimeters).
Mean annual soil temperature: 60 to 63 degrees F (16 to 17 degrees C).
Soil moisture control section: dry in all parts from about May 15 to November 15 (180 days), and moist in all parts from about January 15 to April 15 (90 days).
Soil reaction: moderately acid to slightly alkaline throughout the profile.
Particle size control section: Clay: ranges 4 to 10 percent; Coarse fragments: ranges 40 to 55 percent mostly gravel.
Base saturation by ammonium acetate: 86 to 100 %
A horizon(s):
Hue: 10YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Texture of the fine earth fraction: loamy coarse sand and coarse sand
Clay content: 2 to 10 percent
Rock fragments: 5 to 20 percent gravel
C horizon(s):
Hue: 10YR
Value: 4 or 5 dry; 3 or 4 moist
Chroma: 3 or 4 dry or moist
Texture of the fine earth fraction: Loamy sand, Loamy coarse sand
Clay content: 2 to 10 percent
Rock fragments: 5 to 30 percent gravel
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Pinncamp soils are on stream terraces. Slopes range from 0 to 5 percent. These soils formed in alluvium from igneous rocks. Elevation ranges from 980 to 1,640 feet (300 to 500 meters). The climate is characterized by hot, dry summers and cool, moist winters. Mean annual precipitation is 17 to 19 inches (432 to 483 millimeters). The mean annual temperature is about is 59 to 63 degrees F (15 to 17 degrees C). Frost free season is 190 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the Toags series. Toags soils are under chamise and do not have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; medium or high runoff; rapid permeability. These soils do not flood or pond.
USE AND VEGETATION: This soil is used for watershed, wildlife habitat and recreation. Vegetation is live oak forest.
DISTRIBUTION AND EXTENT: San Benito County, California in MLRA 14 Central California Coastal Valleys. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: San Benito County, California. Source of name is a rock formation in Pinnacles National Monument. This series was established based on limited acreage observed within the National Park Service Pinnacles National Monument boundary.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic Epipedon: the zone from 4 to 36 inches (10 to 91 centimeters) (A1, A2, and A3 horizons)
ADDITIONAL DATA:
This pedon was originally "sampled as" Corralitos.
Pedon information for this type location only:
Pedon Type: typical pedon for series Lab Source ID: NSSL
Pedon Purpose: research site Lab Pedon #: 06N0203