LOCATION MAYACAMA                CA

Established Series
DWS/WDB/TDC/SBS/AEC
03/2018

MAYACAMA SERIES


The Mayacama series consists of moderately deep, somewhat excessively drained soils formed in material derived from sedimentary and metasedimentary rocks. Mayacama soils are on hills and have slopes of 9 to 75 percent. The mean annual precipitation is about 40 inches and the mean annual temperature is about 55 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, active, mesic Typic Dystroxerepts

TYPICAL PEDON: Mayacama very gravelly sandy loam - on a north-facing convex slope of 70 percent under interior live oak, California laurel, knobcone pine, and California nutmeg at 2,800 feet elevation. (Colors are for dry soil unless otherwise stated. When described on 8/14/80, the soil was dry throughout.)

A--0 to 5 inches (0 to 13 cm); pale brown (10YR 6/3) very gravelly sandy loam, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common medium and coarse interstitial pores; 50 percent pebbles 2 to 75 mm in diameter and 5 percent cobbles; neutral (pH 7.0); clear wavy boundary. (3 to 10 inches thick)

Bw1--5 to 16 inches (13 to 41 cm); very pale brown (10YR 7/4) very gravelly sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common very fine and many medium roots; common medium and coarse interstitial pores; 45 percent pebbles 2 to 75 mm in diameter and 5 percent cobbles; moderately acid (pH 6.0); clear irregular boundary. (8 to 15 inches thick)

Bw2--16 to 31 inches (41 to 79 cm); very pale brown (10YR 7/4) extremely gravelly sandy clay loam, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common medium, coarse, and very coarse roots; common medium and coarse interstitial pores; 45 percent pebbles 2 to 75 mm in diameter and 15 percent cobbles; moderately acid (pH 5.8); clear irregular boundary. (9 o 18 inches thick)

R--31 to 35 inches (79 to 89 cm); very hard, fractured sandstone; fractures are 25 mm apart and less than 1 mm wide; few fine roots in fractures.

TYPE LOCATION: Lake County, California, Mendocino National Forest; about 2.3 miles north on forest road 24N02 toward Pacific Ridge from its junction with road 15N01 (Bartlett Springs Road), then about 50 feet upslope; near the center of projected section 34, T. 16 N., R. 7 W., M.D.B.M. 39 degrees 11 minutes 45 seconds North 122 degrees 37 minutes 31.7 seconds West, NAD83.

RANGE IN CHARACTERISTICS: Depth to a fractured lithic contact is 20 to 40 inches. The mean annual soil temperature is 54 degrees to 59 degrees F. The soil between the depths of 15 and 31 inches is dry in all parts for about 135 days from June 15 to October 15, and is moist in all parts for about 120 days from December 15 to April 15. The particle-size control section is 15 to 25 percent clay and contains 35 to 60 percent rock fragments. Base saturation (NH40Ac) is 25 to 60 percent and is less than 50 percent in some part of the B horizon. A gravel mulch 1/2 to 1 inch thick is present in some pedons.

The A horizon is 10YR 4/3, 5/3, 5/4, 6/3, 6/4; 7.5YR 4/4, 5/4, 5/6 or 6/4. Moist color is 10YR 3/4, 4/3, 4/4; 7.5YR 3/2, 3/4 or 4/4. It is gravelly loam, gravelly sandy loam, very gravelly loam or very gravelly sandy loam. Rock fragment content is 25 to 60 percent. It is neutral to medium acid.

The Bw horizon is 10YR 4/3, 4/4, 5/3, 5/4, 6/3, 6/4, 7/4; 7.5YR 5/4, 5/6, 6/4 or 7/4. Moist color is 10YR 4/3, 4/4, 5/4, 5/6; 7.5YR 3/4, 4/4, 4/6 or 5/4. It is very gravelly loam, very gravelly sandy loam or very gravelly sandy clay loam. Some pedons may have very cobbly B horizons. Rock fragment content is 35 to 60 percent and consists of 30 to 50 percent gravel and 5 to 20 percent cobbles. It is slightly or strongly acid.

COMPETING SERIES: These are the Atring, Boldhill (T), Beausite, Brew (T), Chamate (T), Clallam, Farbar, Inskip, Kanid (T), Kindig, Neuns, Straight, Terbies, Vena, and Woodin (T) series. Atring (T) and Straight soils are 20 to 40 inches deep to a paralithic contact. Boldhill soils are over 60 inches deep and have formed on terminal moraines. Beausite soils have a Bir horizon. Brew (T) soils are dry for 45 to 60 consecutive days and formed on andesite. Chamate (T), Kindig, Kanid (T), and Terbies soils are deeper than 40 inches to a lithic or paralithic contact. Clallam soils are 20 to 40 inches deep to a paralithic contact and have 49 to 51 degrees F. MAST. Farbar soils are deeper than 60 inches. Inskip, Neuns and Vena soils have a mean annual soil temperature of 47 degrees to 54 degrees F. Woodin (T) soils are dry in all parts for about 90 days and moist in all parts for about 180 days.

GEOGRAPHIC SETTING: Mayacama soils are on hills. Slopes are 9 to 75 percent. The soils form in material derived from sedimentary or metasedimentary rocks. Elevations are 1,000 to 4,000 feet. The soils at elevations of more than 3,000 feet are usually on south and west facing slopes. The climate is subhumid with warm dry summers and cool moist winters. Mean annual precipitation is 30 to 50 inches. Mean January temperature is 40 degrees F., mean July temperature is 68 degrees F., mean annual temperature is 55 degrees F. Frost-free season is 135 to 225 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Etsel, Hopland, and Maymen soils. Etsel and Maymen soils are less than 20 inches deep to a lithic contact. Hopland soils are fine-loamy and have an argillic horizon.

DRAINAGE AND PERMEABILITY: Somewhat excessively drained; low to high runoff; moderate permeability.

USE AND VEGETATION: This soil is used mainly for wildlife habitat, watershed and some firewood production. Natural vegetation includes interior live oak, California laurel, California nutmeg. knobcone pine, scrub oak, California black oak, and sparse Douglas-fir.

DISTRIBUTION AND EXTENT: Coast Range of Northern California. The series is not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Lake County, California 1983.

OSED scanned by SSQA. Classification updated at family level but series was not recomputed in 1996.

Edits made after sdjr projects-AEC


National Cooperative Soil Survey
U.S.A.