LOCATION TARQUIN CA
Established Series
Rev: ACF/JPS/ET
01/2013
TARQUIN SERIES
The Tarquin series consists of very deep, moderately well drained soils formed colluvium and residuum derived from weakly consolidated siltstone and conglomerate. Tarquin soils are on dissected fan remnants and hills and have slopes of 9 to 30 percent. The mean annual precipitation is about 2160 millimeters (85 inches) and the mean annual temperature is about 12 degrees C (53 degrees F).
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, isomesic Oxyaquic Palehumults
TYPICAL PEDON: Tarquin loam - on a northeast-facing slightly convex slope of 15 percent under redwood, western hemlock, California huckleberry, red huckleberry, salal, salmonberry, Pacific rhododendron, swordfern, and redwood sorrel at 420 meters (128 feet) elevation. (Colors are for moist soil unless otherwise stated. When described October 19, 2005, the soil was moist throughout.)
Oi--0 to 8 centimeters (0 to 3 inches); black (10YR 2/1) slightly decomposed needles, leaves and twigs, dark brown (10YR 3/3) dry; loose, nonsticky and nonplastic; common very fine, fine, and medium roots; many very fine and fine interstitial pores; 35 percent wood fragments; very strongly acid (pH 4.5); clear smooth boundary. (Thickness of the Oi horizon is 0 to 15 centimeters (0 to 6 inches))
A1--8 to 21 centimeters (3 to 8 inches); dark brown (10YR 3/3) loam, brown (10YR 5/3) dry; moderate very fine and weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine, and common medium roots; common very fine and fine tubular and many very fine and fine interstitial pores; 7 percent gravel; very strongly acid (pH 5.0); clear wavy boundary.
A2--21 to 51 centimeters (8 to 20 inches); dark brown (10YR 3/3) loam, yellowish brown (10YR 5/4) dry; moderate very fine and weak fine subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and interstitial pores; 7 percent gravel and 3 percent paragravels; strongly acid (pH 5.2); clear wavy boundary. (Combined thickness of the A horizons is 25 to 40 centimeters (10 to 16 inches))
BA--51 to 62 centimeters (20 to 24 inches); dark yellowish brown (10YR 4/4) clay loam, light yellowish brown (10YR 6/4) dry; moderate fine and weak medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine, fine, medium, coarse and very coarse roots; common very fine and fine tubular and interstitial pores; 3 percent gravel; strongly acid (pH 5.1); clear smooth boundary. (Thickness of the BA horizon is 0 to 25 centimeters (0 to 10 inches))
Bt1--62 to 77 centimeters (24 to 30 inches); dark yellowish brown (10YR 4/4) clay loam; brownish yellow (10YR 6/6) dry; moderate fine subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; common fine, medium, coarse and very coarse roots; common very fine and fine tubular and interstitial pores; 7 percent gravel and 3 percent paragravel; few distinct clay films on faces of peds and rock fragments; very strongly acid (pH 4.6); clear wavy boundary.
Bt2--77 to 93 centimeters (30 to 37 inches); dark yellowish brown (10YR 4/4) silty clay loam; light yellowish brown (10YR 6/4) dry; moderate fine and weak medium subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; common very fine, fine, medium, coarse and very coarse roots; common fine tubular and common very fine and fine interstitial pores; 3 percent gravel and 5 percent paragravel; few distinct clay films on faces of peds, rock fragments, and on surfaces along root channels; common fine distinct iron mass concentrations throughout soil matrix, dark yellowish brown (10YR 4/6) moist and common fine distinct iron depletions throughout matrix, gray (2.5Y 5/1) moist; very strongly acid (pH 4.5); clear smooth boundary.
Bt3--93 to 128 centimeters (37 to 50 inches); yellowish brown (10YR 5/4) silty clay loam; very pale brown (10YR 7/4) dry; moderate medium and weak coarse subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; common fine, medium, coarse and very coarse roots; moderately few very fine tubular and common very fine and fine interstitial pores; 3 percent gravel and 7 percent paragravel; few distinct clay films on faces of peds, rock fragments, and on surfaces along root channels; common fine distinct iron mass concentrations throughout soil matrix, dark yellowish brown (10YR 4/4) moist and common fine distinct iron depletions throughout matrix, grayish brown (2.5Y 5/2) moist; very strongly acid (pH 4.5); clear smooth boundary. (Combined thickness of the Bt horizons is 30 to 150 centimeters (12 to 59 inches))
CBt--128 to 152 centimeters (50 to 60 inches); light olive brown (2.5Y 5/3) very paragravelly silty clay loam; pale yellow (2.5Y 7/4) dry; weak coarse subangular blocky structure; hard, very firm, moderately sticky and moderately plastic; common fine, medium, and coarse roots; moderately few very fine interstitial pores; 5 percent gravel and 40 percent paragravel; common fine distinct iron mass concentrations throughout soil matrix, dark yellowish brown (10YR 4/4) moist and common fine distinct iron depletions throughout matrix, grayish brown (2.5Y 5/2) moist; very strongly acid (pH 4.5); (Thickness of the CBt horizon is 0 to 100 centimeters (0 to 39 inches))
TYPE LOCATION: Jedediah Smith Redwoods State Park, Del Norte County, California; located approximately 8 meters (25 feet) upslope from Boy scout trail, 41 degree, 46 minutes, 19.6 seconds north latitude and 124 degrees, 07 minutes, 7.4 seconds west longitude; HBLM; USGS Hiouchi Quadrangle. UTM Zone 10 407020mE 4625080mN, NAD83
RANGE IN CHARACTERISTICS:
Soil Moisture: The soil is moist in all parts in the soil moisture control section throughout the year. The soils have an Udic moisture regime and an oxyaquic regime subclass. A seasonal water table is present for 20 or more consecutive days or 30 or more cumulative days in most years within the zone from 77 to 152 centimeters (30 to 60 inches).
Soil Temperature: The mean annual soil temperature is 10 to 13 degrees C (50 to 55 degrees F). The difference between mean summer and mean winter temperature is 2 to 4 degrees C.
Organic Matter: There is 12 to 25 kg per square meter of organic carbon to a depth of one meter.
Reaction is moderately to very strongly acid throughout. Base saturation is 5 to 35 percent between depths of 25 to 200 centimeters.
Particle-Size Control Section (weighted average):
Rock fragments: 0 to 10 percent gravel.
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.
Texture: slightly decomposed organic material.
Wood fragments: 0 to 35 percent.
Reaction: moderately to very strongly acid.
A horizon
Hue: 10YR or 2.5Y.
Value: 4 or 5 dry, 3 or 4 moist.
Chroma: 3 or 4 dry, 2 through 4 moist.
Texture of fine earth: loam.
Rock fragments: 0 to 10 percent gravel and 0 to 5 percent paragravel.
Clay content: 20 to 27 percent.
Upper Bt horizon
Hue: 7.5YR, 10YR, or 2.5Y.
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 4 through 6 dry and moist.
Texture of fine earth: silty clay loam or clay loam.
Rock fragments: 0 to 10 percent gravel and 0 to 5 percent paragravel.
Clay content: 27 to 35 percent.
Lower Bt horizon
Hue: 7.5YR, 10YR, or 2.5Y.
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 4 through 6 dry and moist.
Texture of fine earth: silty clay loam or clay loam.
Rock fragments: 0 to 25 percent gravel and 0 to 10 percent paragravel.
Clay content: 35 to 40 percent.
Redoximorphic features:
Amount: common
Kind: fine and medium iron mass concentration and depletions in matrix
Hue: 7.5YR, 10YR, or 2.5Y
Value: 4 through 6 moist
Chroma: 1 through 8 moist
C horizon
Hue: 10YR or 2.5Y
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 3 or 4 dry or moist.
Texture of fine earth: silty clay loam
Rock fragments: 0 to 15 percent gravel and 0 to 40 paragravel.
Clay content: 30 to 40 percent.
Redoximorphic features:
Amount: common
Kind: fine and medium iron mass concentrations and depletions in matrix
Hue: 7.5YR, 10YR, or 2.5Y
Value: 4 through 6 moist
Chroma: 1 through 8 moist
COMPETING SERIES: These is the Tarquin soils. Tarquin soils are formed in marine deposits on uplifted terraces.
GEOGRAPHIC SETTING: Tarquin soils occur on dissected fan remnants and side slopes of hills. Slopes are 9 to 30 percent. Elevations are 50 to 198 meters (160 to 645 feet). The soils formed in colluvium and residuum derived from weakly consolidated siltstone and conglomerate. The climate is humid with cool foggy summers and cool moist winters. Coastal influence limits the annual and diurnal range in temperature. Mean annual precipitation ranges from 1900 to 2290 millimeters (75 to 90 inches). Mean January temperature is about 9 degrees C; mean July temperature is about 13 degrees C; and the mean annual temperature is 10 to 13 degrees C (50 to 55 degrees F). Frost-free season is 275 to 325 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Battery,
Catchings, and Copperceek soils. Battery soils do not have redoximorphic features. Catchings soils do not have redoximorphic features and have greater than 35 percent rock fragments in the particle-size control section.
Coppercreek soils do not have redoximorphic features and have an ochric epipedon. Battery and Catchings are at higher elevations. Coppercreek soils are found on slightly convex and linear areas on sandstone and shale.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; high runoff; moderately low saturated hydraulic conductivity.
USE AND VEGETATION: This soil is used for wildlife, recreation and watershed. Natural vegetation consists of redwood, western hemlock, evergreen huckleberry, red huckleberry, Pacific rhododendron, cascara, salmonberry, salal, swordfern, and redwood sorrel.
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: Humboldt Del Norte area, California 2007. Source of name is from Tarquin, a ship that sank off the coast of Del Norte County in 1851.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Umbric epipedon - the zone from 8 to 51 centimeters (A1 and A2 haorizons).
2. Argillic horizon - the zone from 51 to 152 centimeters (BA, Bt1, Bt2, Bt3 and CBt orizons).
3. Palehumult feature - clay does not decrease with depth.
4. Particle-size control section - the zone from 51 to 101 centimeters, averages 34 percent clay and 4 percent rock fragments.
Soils classified using Keys to Soil Taxonomy, 10th edition.
National Cooperative Soil Survey
U.S.A.