LOCATION DOOLYVILLE CA

Established Series
Rev: JHP/JPS/ET
07/2016

DOOLYVILLE SERIES

The Doolyville series consists of very deep, somewhat poorly drained soils formed in colluvium derived from mudstone, sandstone, and siltstone. Doolyville soils are on mountains and have slopes of 30 to 50 percent. The mean annual precipitation is about 1900 millimeters (75 inches) and the mean annual temperature is about 13 degrees C (55 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquultic Haploxeralfs

TYPICAL PEDON: Doolyville silt loam - on a uniform, west-facing slope of 31 percent under Oregon white oak, poison oak, annual and perennial grasses and forbs at 250 meters (820 feet) elevation. (Colors are for moist soil unless otherwise stated. When described on May 14, 1986, the soil was moist throughout.)

Oi--0 to 3 centimeter (0 to 1 inch); slightly decomposed oak leaves, grass litter and moss; moderately acid (pH 6.0). (0 to 3 centimeters thick)

A--3 to 15 centimeters (1 to 6 inches); very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; moderate fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and common fine roots; common very fine and few fine tubular pores; strongly acid (pH 5.5); 6 percent gravel; gradual wavy boundary. (8 to 15 centimeters thick)

ABt--15 to 28 centimeters (6 to 11 inches); dark brown (10YR 3/3) silty clay loam, grayish brown (2.5Y 5/2) dry; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine and few medium roots; common very fine and fine tubular pores; few faint clay films on faces of peds; strongly acid (pH 5.5); 5 percent gravel; gradual wavy boundary. (8 to 35 centimeters thick)

Bt--28 to 37 centimeters (11 to 15 inches); olive brown (2.5Y 4/3) silty clay loam, light brownish gray (2.5Y 6/2) dry; moderate medium and coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine, fine and medium roots; common very fine and fine tubular pores; common faint clay films on faces of peds and in pores; strongly acid (pH 5.5); 5 percent gravel; gradual wavy boundary. (8 to 56 centimeters thick)

Btg--37 to 46 centimeters (15 to 18 inches); dark gray (5Y 4/1) gravelly silty clay loam, gray (5Y 6/1) dry; weak coarse subangular blocky structure; hard, firm, moderately sticky and slightly plastic; common very fine and fine, few medium roots; common very fine and few fine tubular pores; common distinct clay films on faces of peds and in pores; common medium distinct light yellowish brown (2.5Y 6/4) masses of iron accumulation, light olive brown (2.5Y 5/4) moist; strongly acid (pH 5.5); 25 percent gravel; clear wavy boundary. (9 to 53 centimeters)

Cg1--46 to 55 centimeters (18 to 22 inches); dark gray (5Y 4/1) gravelly silty clay loam, gray (5Y 5/1) dry; massive; very hard, firm, slightly sticky and slightly plastic; few very fine, fine, and medium roots; common very fine tubular pores; common medium faint light brownish gray (2.5Y 6/2) iron depletions, dark grayish brown (2.5Y 4/2) moist; moderately acid (pH 6.0); 31 percent gravel; clear wavy boundary.

Cg2--55 to 79 centimeters (22 to 31 inches); dark gray (N 4/) gravelly silty clay loam, gray (N 5/) dry; massive; very hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; few very fine tubular pores; neutral (pH 7.0); 24 percent gravel; gradual wavy boundary.

Cg3--79 to 154 centimeters (31 to 61 inches); dark gray (5Y 4/1) very gravelly loam, gray (N 5/) dry; massive; hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; few very fine tubular pores; moderately alkaline (pH 8.0); slightly effervescent; 50 percent gravel. (Combined thickness 44 to 110 centimeters)

TYPE LOCATION: Redwood National Park, Humboldt. County, California; in Devils Earthflow prairie; southeast quarter, northeast quarter, Section 34, T. 9N. R. 2 E., WGS84 Decimal degrees 41.1299167 latitude and -123.9251583 longitude; HBLM; USGS Panther Creek Quadrangle. UTM Zone 10 422345mE 4553592mN; NAD83.

RANGE IN CHARACTERISTICS:

Soil Moisture: The soil is usually moist in all parts in the soil moisture control section from about November 1 to June 15, and is dry in some or all parts from about July 15 to October 15 in most years. The soils have a xeric moisture regime and an aquic regime subclass. A seasonal water table is present at a depth of 30 centimeters (12 inches).

Soil Temperature: The mean annual soil temperature is 10 to 15 degrees C (50 to 59 degrees F). The difference between mean summer and mean winter temperature is 6 to 10 degrees C.

The mollic epipedon is 25 to 38 centimeters thick.

Depth to Redoximorphic features is 30 to 50 centimeters.

Base saturation, by ammonium acetate, is greater than 35 percent in the A and C horizons and less than 35 percent in the ABt and Bt horizons.

Particle-Size Control Section (weighted average):

Rock fragments: 10 to 35 percent gravel and 0 to 15 percent cobbles.
Clay content: 27 to 35 percent clay.

O horizon

Hue: 10YR.
Value: 2 through 6 dry and moist.
Chroma: 1 through 4 dry and moist.

In lieu of texture: slightly decomposed organic material.
Wood fragments: 0 to 35 percent.
Reaction: neutral to moderately acid.

A horizon

Hue: 10YR or 2.5Y.
Value: 4 or 5 dry, 2 through 4 moist.
Chroma: 1 through 3 dry, 1 through 3 moist.

Texture of fine earth: silt loam.
Rock fragments: 0 to 13 percent gravel.
Clay content: 20 to 26 percent clay.
Reaction: is moderately to strongly acid.

Bt horizon

Hue: 10YR or 2.5Y.
Value: 5 or 6 dry, 4 or 5 moist.
Chroma: 2 through 4 dry, 2 or 3 moist.

Texture of fine earth: silty clay loam.
Rock fragments: 5 to 35 percent gravel and 0 to 15 percent cobbles.
Clay content: 27 to 35 percent clay.
Reaction: is moderately to strongly acid.

Btg horizon

Hue: 10YR, 2.5Y, or 5Y.
Value: 4 through 6 dry, 3 through 5 moist.
Chroma: 1 or 2 dry, 1 or 2 moist.

Texture of fine earth: silty clay loam.
Rock fragments: 15 to 30 percent gravel and 0 to 5 percent cobbles.
Clay content: 30 to 35 percent clay.
Reaction: is moderately acid to moderately alkaline.

Redoximorphic features:

Type: fine and medium iron-manganese masses in the matrix, iron stains lining root channels and/or pores
Quantity: common to many
Hue: 7.5YR, 10YR, or 2.5Y.
Value: 5 or 6 dry, 4 or 5 moist.
Chroma: 4 or 6 dry, 4 through 8 moist.

Cg horizon

Hue: 10YR, 2.5Y, 5Y, or N.
Value: 5 or 6 dry, 3 through 5 moist.
Chroma: / through 2 dry, / through 2 moist.

Texture of fine earth: loam or silty clay loam.
Rock fragments: 15 to 50 percent gravel and 0 to 10 percent cobbles.
Clay content: 24 to 40 percent clay.
Reaction: moderately acid to moderately alkaline.

Redoximorphic features:
Type: fine and medium iron-manganese masses in the matrix, iron stains lining root channels and/or pores

Quantity: common to many
Hue: 7.5YR, 10YR, or 2.5Y.
Value: 5 or 6 dry, 4 or 5 moist.
Chroma: 2 through 6 dry, 2 through 8 moist.

COMPETING SERIES: These are the Deadmanbay, Killebrew, Mitchellbay, Quatama, Stockel and Sucia series. Deadmanbay soils have a densic contact between 100 and 152 centimeters. Killebrew soils have a massive E horizon, with a bulk density of more than 1.8 g/cm3, and a hard dry rupture resistance. Mitchellbay soils have a densic contact at depths of 50 to 100 centimeters. Quatama soils are moderately well drained soils that formed in stratified glaciolacustrine deposits and the difference between mean summer and winter temperature of greater than 10 degrees C. Stockel soils have an ochric epipedon, redomorphic concentrations above 30 centimeters and a clay layer with 50 to 65 percent clay below 100 centimeters. Sucia soils are 50 to 100 centimeters to a densic contact.

GEOGRAPHIC SETTING: Doolyville soils are on lower mountain slopes on or near earthflows. Slopes are 30 to 50 percent. Elevations are 53 to 900 meters (170 to 2950 feet). The soils formed in colluvium derived from mudstone, sandstone, and siltstone. The climate is humid with cool, foggy summers and cool, rainy winters. Mean annual precipitation is 1780 to 2160 millimeters (70 to 85 inches). Mean January temperature is about 7 degrees C; mean July temperature is about 15 degree C; and the mean annual temperature is 10 to 15 degree C (50 to 59 degrees F). Frost free season is about 240 to 270 days.

GEOGRAPHICALLY ASSOCIATED SOILS: This isthe Pasturerock soils. Pasturerock soils lack redoximorphic features in the particle-size control section. The Pasturerock soils are on raised areas in drier locations above the Doolyville soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained; very high runoff; saturated hydraulic conductivity is moderately high in the surface layer, moderately low in the subsoil and low in the substratum.

USE AND VEGETATION: This soil has been used for livestock grazing, recreation, wildlife habitat, and watershed. The native vegetation is oak woodland. Species include Oregon white oak, poison oak, annual and perennial grasses and forbs, with scattered big-leaf maple, Douglas fir and California bay. Invasion by Douglas fir and succession to forest is in progress.

DISTRIBUTION AND EXTENT: California Coastal Redwood Belt; MLRA 4B. The series is not extensive.

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

SERIES ESTABLISHED: Redwood National Park portion, Humboldt and Del Norte Area Soil Survey, California, 2007. The source of the name is from "Doolyville", historic site in Coyote Creek watershed, located in Redwood National Park south of the town of Orick.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

1. Mollic epipedon - the zone from 3 to 28 centimeters (A & ABt horizons)
2. Argillic horizon - the zone from 15 to 46 centimeters (BAt, Bt & Btg horizons)
3. Redoximorphic features - in the zone from 37 to 154 centimeters (Btg, Cg1, Cg2 & Cg3 horizons)
4. Haploxeralfs feature -. Base saturation of 35 to 50 percent, by ammonium acetate, at 125 centimeters below the upper boundary of the argillic horizon (Cg3 horizon)
5. Aquultic Haploxeralfs feature - seasonal water table, depleted matrix and aquic conditions for more than 30 days in most years within the zone from 37 to 46 centimeters (Btg horizon)
6. Particle-size control section - the zone from 15 to 46 centimeters, averages 32 percent clay, 14 percent fine sand or coarser, by weight, 11 percent gravel, and 3 percent cobble, by volume. CEC/clay ratio averages 0.99

ADDITIONAL DATA: Soil sample 89-RNP-14 was collected from a similar pedon and analyzed chemically at the Oregon State University Soil Testing Laboratory.

NASIS User Pedon ID: 86CA605REDW008

Soil classified using the 12th Edition of the Keys to Soil Taxonomy.

National Cooperative Soil Survey
U.S.A.