LOCATION SHINGLEMILL CAEstablished Series
TAXONOMIC CLASS: Fine, mixed, semiactive, isomesic Aquic Hapludults
TYPICAL PEDON: Shinglemill loam - on a northeast facing slope of 2 percent under Bishop pine and Mendocino cypress at 570 feet elevation. (Colors are for dry soil unless otherwise noted. When described on October 23, 1984, the soil was moist throughout.)
Oi--2 inches to 0; litter of bishop pine and manzanita.
E--0 to 3 inches; variegated light gray, (10YR 7/2) light brownish gray (10YR 6/2) and very pale brown (10YR 7/4) loam, grayish brown (10YR 5/2) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine and few medium roots; common very fine interstitial and tubular pores; 10 percent hard subrounded yellowish red (5YR 5/6) nodules (2-30mm); very strongly acid (pH4.5); clear wavy boundary. (2 to 9 inches thick)
BE--3 to 8 inches; variegated very pale brown (10YR 7/4) and reddish yellow (7.5YR 6/6) loam, yellowish brown (10YR 5/4) moist; moderate fine medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine and few medium and coarse roots; common very fine interstitial and tubular pores; very strongly acid (pH 4.9); clear wavy boundary. (0 to 6 inches thick)
Bt1--8 to 15 inches; very pale brown (10YR 7/4) loam, yellowish brown (10YR 5/6) moist; moderate fine, medium and coarse subangular blocky structure; hard, friable, sticky and plastic; few very fine, medium and coarse and common fine roots; common very fine interstitial and tubular pores; few thin clay films on faces of peds and lining pores; very strongly acid (pH 4.6); clear wavy boundary. (4 to 10 inches thick)
Bt2--15 to 25 inches; light yellowish brown (10YR 6/4) clay, yellowish brown (10YR 5/6) moist; moderate fine through coarse subangular blocky structure; hard, friable, sticky and plastic; few fine and medium roots; few very fine interstitial and common very fine tubular pores; many moderately thick and thick clay films on faces of peds and lining pores; extremely acid (pH 4.2); gradual wavy boundary. (6 to 15 inches thick)
Btv1--25 to 31 inches; light yellowish brown (10YR 6/4) clay, yellowish brown (10YR 5/6) moist; common fine prominent light gray (2.5Y 7/2) redox depletions, light gray (2.5Y 7/2) moist, and common fine and medium prominent red (10YR 4/6) redox concentrations, red (10YR 4/6) moist; strong very fine, fine and medium angular blocky structure; hard, firm, sticky and plastic; few fine roots; few very fine interstitial pores; continuous moderately thick and thick clay films on faces of peds and lining pores; red mottles are mainly soft plinthite with a firm moist consistence; very strongly acid (pH 4.6); gradual wavy boundary. (5 to 15 inches thick)
Btv2--31 to 50 inches; yellow (10YR 7/6) clay, brownish yellow (10YR 6/6) moist; common fine and medium prominent white (10YR 8/1) redox depletions, white (10YR 8/2) moist, and common fine and medium prominent red (10R 4/6) redox concentrations, red (10Y 4/6) moist; strong medium and coarse angular blocky structure; few fine roots; few very fine interstitial pores; continuous moderately thick and thick clay films on faces of peds and lining pores; red mottles are mainly soft plinthite with a firm moist consistence; extremely acid (pH 4.1); diffuse wavy boundary. (5 to 20 inches thick)
2Bt3--50 to 63 inches; brownish yellow (10YR 6/6) sandy clay, yellowish brown (10YR 5/6) moist; common fine and medium prominent white (10YR 8/2) mottles, light gray (10YR 7/2) moist; strong medium and coarse angular blocky structure; hard, firm, sticky and plastic; few fine roots; common very fine interstitial pores; continuous moderately thick and thick clay films on faces of peds and lining pores; 10 percent very hard red (2.5YR 4/6) nodules (5-60mm); very strongly acid (pH 4.5).
TYPE LOCATION: Mendocino County, California; about 1,900 feet north and 400 feet west of the southeast corner of section 21, T.17 N., R.17 W., MDBM, Mendocino quadrangle.
RANGE IN CHARACTERISTICS: Depth of solum is greater than 60 inches. The mean annual soil temperature is 50 to 56 degrees F. The difference between mean summer and mean winter soil temperature varies from 6 to 9 degrees F. The soil between the depths of 7 and 21 inches is moist in all parts from November 1 to August 15 and is dry in some part from September 1 to October 1 in most years. The particle-size control section averages 35 to 45 percent clay. Reaction is extremely or very strongly acid (pH 4.1 to 5.0).
The E horizon is 10YR 5/1, 6/1, 6/2, 7/2, 7/3 or 7/4. Moist color is 10YR 5/1, 5/2, 5/3, 6/1, 6/2 or 6/3. Clay content ranges from 7 to 15 percent. The horizon may be slightly smeary and may be slightly brittle when moist. Iron nodules range from 2 to 15 percent and are 2 to 30 mm in diameter.
The BE horizon is 10YR 6/4, 6/6, 7/1, 7/4; 7.5YR 5/8 or 6/6. Moist colors are 10YR 5/4, 6/2, 6/6 or 6/8. The horizon is often variegated. It is loam or sandy clay loam. Clay content ranges from 10 to 27 percent. The horizon may be slightly smeary and may be slightly brittle when moist. Iron nodules range from 0 to 15 percent and are 2 to 40mm wide.
The Bt horizon is 5Y 6/1,7/1; 2.5Y 6/1, 7/1; 10YR 6/4, 6/6, 7/1, 7/2, 7/4 or 7/6. Moist color is 5Y 5/1, 6/1, 7/1; 2.5Y 5/2, 5/4, 6/2; 10YR 5/4, 5/6, 6/4, 6/6, 6/8 or 7.5YR 5/8. Mottle colors are 2.5Y 7/2; 10YR 8/1, 8/2; 7.5YR 4/6, 5/6, 5/8; 5YR 5/8 or 10R 4/6, 4/8. Moist mottle colors are 2.5Y 6/2, 7/2; 10YR 5/8, 6/4, 7/2, 8/2; 7.5YR5/8; 10R 4/6, or 4/8. Redox depletions (grayish colors) occur with redox concentrations (reddish colors) in a regularly occurring reticulate pattern. This pattern occurs within a depth of 15 to 30 inches and continues to 60 inches or more. It is loam, clay loam, clay, or sandy clay. Clay content ranges from 20 to 60 percent. The horizon contains 0 to 20 percent soft plinthite. Iron nodules ranges from 0 to 15 percent and are 2 to 60 mm in size. Base saturation (sum) ranges from 10 to 35 percent.
COMPETING SERIES: This is the Vondergreen series. Vondergreen soils are 40 to 60 inches to a paralithic contact and have values of 2 to 4 in the A horizon..
GEOGRAPHIC SETTING: The Shinglemill soils occur on marine terraces. Slopes are 2 to 15 percent. Elevations are 200 to 750 feet. The soils formed in marine sediments. The climate is humid with cool foggy summers and cool moist winters. A strong marine influence limits the diurnal and annual range of temperature. Mean annual precipitation varies from 40 to 65 inches. Mean January temperature is 48 degrees F., mean July temperature is 57 degrees F., and mean annual temperature is 53 degrees F. The frost-free period is 270 to 330 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aborigine, Blacklock, Gibney and Gibwell soils. All occur on marine terraces. Aborigine soils have colors with chromas of 2 or less between the surface and depth of 10 inches. Blacklock soils are shallow to an iron cemented hardpan. Gibney soils have mottles with chromas of 2 or less between a depth of 30 and 50 inches. Gibwell soils lack mottling.
DRAINAGE AND PERMEABILITY: Poorly drained. The soil is saturated with water for extended periods following episodes of heavy rain from December through April. The saturated zone starts between the depths of 10 and 30 inches and extends to greater than 60 inches from summer through early fall. Surface runoff under bare soil conditions is slow or medium; slow permeability.
USE AND VEGETATION: This soil is used for wildlife habitat, watershed, recreation and homesite development. Vegetation consists of Bishop pine, Mendocino cypress, California huckleberry, glossyleaf manzanita, rhododendron and bear grass.
DISTRIBUTION AND EXTENT: Northern coastal California. The series is not extensive. MLRA 4.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Mendocino County, California, Western part, 1993.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - zone from 0 to 3 inches - (E horizon)
Argillic horizon - zone from 8 to 63 inches (Bt1, Bt2, Btv1, Btv2, Btv3)
Aquic feature - saturation and redox depletions in the upper part of the Bt horizon.
The activity class was added to the classification in February of 2003. Competing series were not checked at that time. - ET