LOCATION REDSANDS CA
Established Series
Rev. JWH/SAA/KP
08/2016
REDSANDS SERIES
The Redsands series consists of very deep, somewhat poorly drained soils formed in marine deposits. Redsands soils are on marine terraces and have slopes of 0 to 5 percent. The mean annual precipitation is about 1015 millimeters (40 inches) and mean annual temperature is about 12 degrees C (54 degrees F).
TAXONOMIC CLASS: Sandy, mixed, mesic Oxyaquic Humudepts
TYPICAL PEDON: Redsands fine sandy loam on a north facing, linear slope of 1 percent under lawn grass, at an elevation of 27 meters (90 feet). (Colors are for moist soils unless otherwise stated. When described on August 11, 2015 the soil was moist below 138 centimeters.)
A1--0 to 8 centimeters; very dark brown (10YR 2/2) fine sandy loam, brown (10YR 4/3) dry; 8 percent clay; moderate fine granular structure; very friable, soft, nonsticky and nonplastic; common fine and very fine roots throughout; strongly acid (pH 5.2); clear smooth boundary.
A2--8 to 35 centimeters; very dark brown (10YR 2/2) fine sandy loam, brown (10YR 4/3) dry; 8 percent clay; weak fine subangular blocky structure; very friable, soft, nonsticky and nonplastic; common fine roots throughout; strongly acid (pH 5.2); abrupt smooth boundary. (Combined thickness of A horizons is 25 to 50 centimeters)
C1--35 to 70 centimeters; dark yellowish brown (10YR 4/6) sand, yellowish brown (10YR 5/6) dry; structureless massive structure; very friable, slightly hard, nonsticky and nonplastic; few very fine tubular pores; 40 percent medium prominent irregular yellowish red (5YR 4/6) iron-manganese masses with diffuse boundaries in matrix; moderately acid (pH 5.8); clear smooth boundary.
C2--70 to 80 centimeters; dark yellowish brown (10YR 4/6) sand, brownish yellow (10YR 6/6) dry; structureless single grain structure; loose, loose, nonsticky and nonplastic; 70 percent medium prominent irregular yellowish red (5YR 4/6) iron-manganese masses with diffuse boundaries in matrix; moderately acid (pH 5.8); abrupt smooth boundary.
C3--80 to 120 centimeters; light olive brown (2.5Y 5/4) sand, pale yellow (2.5Y 7/3) dry; structureless single grain structure; loose, loose, nonsticky and nonplastic; few very fine tubular pores; moderately acid (pH 5.8); clear smooth boundary.
C4--120 to 138 centimeters; light olive brown (2.5Y 5/3) sand, light gray (2.5Y 7/2) dry; structureless single grain structure; loose, loose, nonsticky and nonplastic; slightly acid, (pH 6.2); abrupt smooth boundary.
C5--138 to 145 centimeters; 80 percent yellowish brown (10YR 5/6) and 20 percent light brownish gray (10YR 6/2) sand, 20 percent very pale brown (10YR 7/4) and 80 percent brownish yellow (10YR 6/6) dry; 2 percent clay; structureless single grain structure; loose, loose, nonsticky and nonplastic; 2 percent medium distinct dark yellowish brown (10YR 3/4) iron-manganese masses in matrix and 50 percent medium prominent irregular yellowish red (5YR 4/6) iron-manganese masses with diffuse boundaries in matrix; moderately acid (pH 5.8); clear smooth boundary.
C6--145 to 155 centimeters; 50 percent light brownish gray (10YR 6/2) and 50 percent yellowish brown (10YR 5/6) loamy sand, 50 percent very pale brown (10YR 7/4) crushed and 50 percent brownish yellow (10YR 6/6) dry; 5 percent clay; structureless massive structure; very friable, slightly hard, nonsticky and nonplastic; 50 percent medium prominent irregular yellowish red (5YR 5/6) iron-manganese masses with diffuse boundaries in matrix; moderately acid (pH 5.8). (Combined thickness of C horizons is 100 to 150 centimeters)
TYPE LOCATION: Humboldt County, California; located in the City of Eureka, California; USGS Eureka Quadrangle, CA; WGS84 Decimal degrees 40.784116 latitude, -124.17363639354 longitude. UTM Zone 10 400973mE 4515455mN; NAD83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is not dry in all parts for 90 days or more. The upper part of the soil moisture control section is dry from about September 15 to October 15 in most years. The soils have an udic soil moisture regime and an oxyaquic soil moisture 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 25 to 100 centimeters (12 to 40 inches).
Soil temperature: The mean annual soil temperature at 50 centimeters (20 inches) is 12 to 14 degrees C (53 to 57 degrees F). The average summer soil temperature is about 18 degrees C and the average winter soil temperature is about 9 degrees C. The difference between average summer and winter soil temperatures is about 6 to 9 degrees C. The soils have a mesic soil temperature regime.
The umbric epipedon is 25 to 50 (8 to 20 inches) centimeters thick.
Base Saturation, by ammonium acetate, is less than 60 percent between depths of 25 to 75 centimeters.
Depth to redoximorphic features: 25 to 50 centimeters
Particle-Size Control Section (weighted average):
Clay content: 2 to 6 percent
A horizon
Hue: 10YR
Value: 2 or 3, 3 through 5 dry
Chroma: 2 or 3, dry or moist
Texture of fine earth: fine sandy loam or loamy fine sand
Rock fragments: 0 to 1 percent gravel
Clay content: 7 to 10 percent
Reaction: strongly acid to neutral
Redoximorphic features: fine and medium iron-manganese masses in matrix, along root channels and along pores
Amount: few, common, or many
Hue: 5YR, 7.5YR, or 10YR
Value: 4 or 5
Chroma: 4 through 8
C horizon
Hue: 2.5Y through 5YR.
Value: 4 through 6, 5 through 7 dry
Chroma: 2 through 8 dry or moist
Texture of fine earth: sand or loamy sand
Rock fragments: 0 to 1 percent gravel
Clay content: 0 to 7 percent
Reaction: moderately acid to neutral
Redoximorphic features: fine and medium iron-manganese masses in matrix
Amount: few, common, or many
Hue: 5YR, 7.5YR, 10YR, or 2.5Y
Value: 4 through 6
Chroma: 4 through 6
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Redsands soils are on marine terraces. Slopes are 0 to 5 percent. The soils formed in marine sediments derived from mixed sources. Elevations are 3 to 45 meters (10 to 150 feet). The climate is humid with cool, foggy summers and cool, wet winters. A strong marine influence limits the diurnal and annual range of temperature. The mean annual temperature is 10 to 13 degrees C (51 to 55 degrees F). The mean annual precipitation is 890 to 2285 millimeters (35 to 90 inches). The frost-free period is 275 to 325 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the
Halfbluff series. Halfbluff soils contain 15 percent or more particles with diameters of 0.1 to 75 mm in diameter. Halfbluff soils also have a cambic horizon and are have redoxymorphic features between 50 to 100 centimeters depth.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained; very low runoff; saturated hydraulic conductivity is high.
USE AND VEGETATION: This soil is used predominantly for recreation and urban development. Vegetation includes lawn and landscaping species and California blackberry.
DISTRIBUTION AND EXTENT: Coastal Redwood Belts; MLRA 4B. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Humboldt and Del Norte Counties Soil Survey, Central Part, California, March 2016. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Umbric epipedon - the zone from 0 to 35 centimeters (A1 & A2 horizons).
2. Particle-size control section - the zone from 25 to 100 centimeters, averages 4 percent clay.
3. Oxyaquic Dystrudepts - seasonal water table, aquic conditions for more than 30 days in most years within the zone from 35 to 155 centimeters (C1-C6 horizons)
ADDITIONAL DATA:
NASIS User Pedon ID 15CA600497
Soil classified using the 12th Edition of the Keys to Soil Taxonomy.
National Cooperative Soil Survey
U.S.A.