LOCATION LUMBERLY CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Typic Dystroxerepts
TYPICAL PEDON: Lumberly gravelly coarse sandy loam - on a northwest facing slope of 25 percent under red fir, white fir, Jeffrey pine, whitethorn ceanothus, and greenleaf manzanita at 6,080 feet elevation. (Colors are for dry soil unless otherwise stated. When described on August 9, 1978, the soil was dry throughout).
0--1 to 0 inches; leaves, needles and twigs in various stages of decomposition.
A1--0 to 5 inches; grayish brown (10YR 5/2) gravelly coarse sandy loam, very dark grayish brown (10YR 3/2) moist; strong very fine granular structure; soft, very friable, nonsticky and nonplastic; many fine and medium roots; many fine interstitial pores; 15 percent pebbles; slightly acid (pH 6.4); clear smooth boundary. (4 to 6 inches thick)
A2--5 to 10 inches; yellowish brown (10YR 5/4) gravelly coarse sandy loam, dark brown (10YR 3/3) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many fine and medium roots; many fine interstitial pores; 19 percent pebbles; slightly acid (pH 6.5); clear wavy boundary. (4 to 7 inches thick)
Bw--10 to 26 inches; light brown (7.5YR 6/4) gravelly coarse sandy loam, brown and dark brown (7.5YR 4/4) moist; weak moderate subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and medium roots; many fine interstitial pores; 18 percent pebbles; slightly acid (pH 6.3); clear wavy boundary. (8 to 16 inches thick)
BC--26 to 33 inches; reddish yellow (7.5YR 6/6) gravelly coarse sandy loam, strong brown (7.5YR 5/6) moist; massive; soft, very friable, nonsticky and nonplastic; common fine and medium roots; many fine interstitial pores; 16 percent pebbles; slightly acid (pH 6.2); clear wavy boundary. (5 to 10 inches thick)
Cr--33 to 40 inches; decomposed granodiorite.
TYPE LOCATION: El Dorado County, California; about 1 mile west of Lumberyard Ranger Station on Old Highway 88 on the south side of the road; in the SW 1/4 of the NE 1/4 of section 16, T.8 N., R.15 E., Peddler Hill quadrangle, MDB&M.
RANGE IN CHARACTERISTICS: Depth to a paralithic contact is 20 to 40 inches. The umbric epipedon is 8 to 13 inches thick. The mean annual soil temperature is estimated to be 40 to 47 degrees F. The soil is dry in all parts of the moisture control section from early August through early October. It is usually moist in some or all parts the rest of the year. Base saturation (ammonium acetate) is less than 20 percent throughout the profile. The soil is coarse sandy loam or sandy loam throughout. Clay content averages 5 to 15 percent. Gravel content ranges from 5 to 25 percent. Cobble content ranges from 0 to 10 percent. The soil is slightly or medium acid throughout.
The A horizon has dry colors of 10YR 4/2, 4/3, 4/4, 5/2, 5/3, or 5/4. Moist colors are 7.5YR 3/2; 10YR 3/2, or 3/3.
The Bw horizon has dry colors of 7.5YR 5/4, 6/4; 10YR 4/4, 6/2, or 6/4. Moist colors are 7.5YR 3/4, 4/4; 10YR 3/4, or 4/3. Some pedons have C horizons.
The Cr horizon is strongly weathered granitic rock that is easily dug by hand tools but retains the original rock structure. Root penetration is restricted with only a few extending along joints or fractures.
COMPETING SERIES: This is the Gerle series in the same family and the Bighill series. Gerle soils are greater than 60 inches deep. Bighill soils are mesic.
GEOGRAPHIC SETTING: Lumberly soils are on mountainsides. Slopes are 5 to 50 percent. The soils formed in material weathered from granitic rocks. Elevations are 5,500 to 8,500 feet. The climate is subhumid with warm dry summers and cool moist winters. The mean annual precipitation varies from 55 to 70 inches, much of which occurs as snow in winter. Mean January temperature is about 27 degrees F; mean July temperature is about 60 degrees F; mean annual temperature is 41 to 45 degrees F. Frost-free season is 80 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ledford, Waca, and Windy soils. Ledford soils are 40 to 60 inches deep. Waca and Windy soils have more than 35 percent rock fragments in the particle-size control section and are medial.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderately rapid permeability.
USE AND VEGETATION: Used mainly for timber production, wildlife habitat, and watershed. Vegetation consists of mixed stands of white fir, red fir, Jeffrey pine, whitethorn ceanothus, and greenleaf manzanita.
DISTRIBUTION AND EXTENT: The central part of the Sierra Nevada range of California. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: El Dorado County, California, 1985.