LOCATION LONGSHORE CA
Established Series
REV:RLR/GML
03/2017
LONGSHORE SERIES
The Longshore series consists of very deep, well drained soils that weathered from fine-grained sandstone. The Longshore soils are on side slopes and uplands of the coastal plain. Slopes range from 0 to 60 percent. The mean annual precipitation is about 400 mm and the mean annual air temperature is about 18 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Argixerolls
TYPICAL PEDON: Longshore sandy loam. (Colors are for dry soils unless otherwise noted.)
Oi--0 to 3 centimeters; slightly decomposed plant material; abrupt wavy boundary. (0 to 6 cm thick)
A1--3 to 20 centimeters; very dark grayish brown (10YR 3/2) sandy loam, very dark brown (10YR 2/2) moist; moderate medium granular and moderate medium subangular blocky structure; very friable, slightly hard, nonsticky and nonplastic; many very fine roots; common fine and very fine irregular pores; 2 percent gravel; moderately acid (pH 6.0); clear wavy boundary.
A2--20 to 40 centimeters; very dark grayish brown (10YR 3/2) sandy loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; friable, moderately hard, slightly sticky and nonplastic; common very fine roots; common fine and very fine irregular pores; 2 percent gravel; slightly acid (pH 6.2); clear wavy boundary. (Combined thickness of A horizons is 5 to 50 cm thick)
Bt1--40 to 56 centimeters; brown (10YR 5/3) sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate coarse subangular blocky structure; firm, hard, moderately sticky and very plastic; common very fine roots; common fine tubular pores; many distinct clay films on faces of peds and clay bridges between sand gains; 4 percent gravel; slightly acid (pH 6.5); clear wavy boundary.
Bt2--56 to 90 centimeters; brown (10YR 5/3) sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate coarse subangular blocky structure; firm, hard, moderately sticky and moderately plastic; common very fine roots; common fine and few medium tubular pores; common clay distinct films on faces of peds and many clay bridges between sand gains; 4 percent gravel; neutral (pH 6.6); gradual wavy boundary.
Bt3--90 to 100 centimeters; brown (10YR 5/3) sandy loam, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; friable, moderately hard, moderately sticky and slightly plastic; common clay bridging between sand grains; 12 percent gravel; neutral (pH 6.6); abrupt smooth boundary. (Combined thickness of Bt horizons is 40 to 120 cm thick)
C1--100 to 120 centimeters; olive (5Y 5/3) fine sand, olive gray (5Y 4/2) moist; single grain; loose, nonsticky and nonplastic; neutral (pH 6.6); abrupt smooth boundary.
C2--120 to 170 centimeters; pale olive (5Y 6/3) fine sand, olive gray (5Y 4/2) moist; single grain; loose, nonsticky and nonplastic; neutral (pH 6.8).
TYPE LOCATION: Los Angeles County, California, Baldwin Hills Scenic Overlook, Culver City, CA. 34 degrees, 1 minutes, 9 seconds North latitude and 118 degrees, 22 minutes, 59 seconds West longitude, WGS84 - U.S.G.S Quad: Beverly Hills.
RANGE IN CHARACTERISTICS:
Soil Moisture: The soil becomes moist below a depth of 30 cm some time from October to December and remains moist in some part between depths of 30 to 90 cm until April or May. It is dry the rest of the year.
Mean annual soil temperature: 17 to 20 degrees C.
Organic matter content: 2 to 4 percent from the surface to a depth of 25 to 50 cm and less than 1 percent in the subsoil.
Clay content: 18 to 27 percent in the particle size control section.
Reaction: slightly acid to slightly alkaline.
Notes: some pedons do not have sandy textures below the argillic horizon.
A horizon:
Dry color: hue of 10YR, value of 3 to 5, chroma of 2 to 4
Moist Color: hue of 10YR, value of 2 or 3, chroma of 1 to 3
Texture: sandy loam, fine sandy loam or loam
Rock fragment: 0 to 10 percent
BA horizon: (where present)
Dry color: hue of 10YR, value of 3 to 5, chroma of 2 to 4
Moist Color: hue of 10YR, value of 2 to 4, chroma of 2 to 4
Texture: sandy loam, fine sandy loam or loam
Rock fragments: 0 to 15 percent
Bt horizon:
Dry color: hue of 10YR, value of 4 to 6, chroma of 3 to 6
Moist Color: hue of 10YR, value of 3 to 6, chroma of 3 to 6
Texture: loam, sandy clay loam, sandy loam or fine sandy loam
Rock fragments: 0 to 15 percent
C horizon:
Dry color: hue of 2.5Y or 5Y, value of 4 to 6, chroma of 3 or 4
Moist Color: hue of 2.5Y or 5Y, value of 4 or 5, chroma of 2 to 4
Texture: sand, fine sand or loamy sand
Rock fragments: 0 to 15 percent
COMPETING SERIES: These are the
Azuvina,
Bohna,
Chualar,
Chuloak,
Feethill,
Flaskan,
Franciscan,
Geghus,
Nauti,
Pinto,
Shimmon,
Soper, and
Tajea soils.
Azuvina soils: have slopes less than 15 percent and are formed in alluvium weathered from granitic sources.
Bohna soils: have a paralithic contact between 100 and 185 cm and are weathered from granitic rocks.
Chualar soils: have a hue of 7.5YR and are formed in alluvium on terraces and alluvial fans.
Chuloak soils: have redox features in the lower B or C horizon and are formed in alluvium from granitic sources.
Feethill soils: have a paralithic contact at a depth of 50 to 100 cm and are on granitic mountains.
Flaskan soils: have a mean annual temperature of 15 degrees C and occur on alluvial fans.
Franciscan soils: have a paralithic contact of sedimentary and metamorphic rock at a depth of 50 to 100 cm.
Geghus soils: has calcium carbonate and are weathered from calcareous shale, sandstone, and/or conglomerate.
Nauti soils: has a paralithic contact at a depth of 50 to 100 cm and are weathered from diorite.
Pinto soils: are moderately well drained and formed in alluvium weathered mainly from sedimentary sources.
Shimmon soils: has a paralithic contact of fine-grained sandstone at a depth of 50 to 100 cm.
Soper soils: have a paralithic contact at a depth of 50 to 100 cm on sandstone or conglomerate.
Tajea soils: have a lithic contact of sandstone at a depth of 50 to 100 cm.
GEOGRAPHIC SETTING:
Landscape: hills
Landform: backslope, sideslopes, terrace risers
Slope: 0 to 60 percent
Parent material: fine-grained sandstone
Elevation: 4 to 160 meters
Climate: warm, dry summers and cool, moist winters
Mean annual precipitation: 320 to 420 mm
Mean January temperature: 14 degrees C
Mean July temperature: 21.5 degrees C
Mean annual air temperature: 16 to 19 degrees C
Frost free season: 320 to 365 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Centinela,
Cropley,
Dapplegray, Filorium,
Grommet,
Nacimiento, and
Windfetch, soils.
Centinela soils: have greater than 35 percent clay and are on low lying terraces and uplifted alluvium.
Cropley soils: have greater than 35 percent clay and are on floodplains and low lying alluvial fans.
Dapplegray soils: has human-transported materials and are on engineered hillslope terraces.
Filiorum soils: have cracks and have greater than 35 percent clay and occur on marine terraces.
Grommet soils: have a mollic epipedon more than 50 centimeters thick and are on alluvial fans.
Nacimiento soils: have a paralithic contact of calcareous sedimentary rock at a depth of 50 to 100 cm and are on hills.
Windfetch soils: have secondary calcium carbonate and average 28 to 33 percent clay in the argillic horizon and occur on uplifted alluvium and terraces.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderate saturated hydraulic conductivity; and high runoff.
USE AND VEGETATION: Longshore soils are used for recreation and rangeland. Vegetation is annual grasses, forbs and oats.
DISTRIBUTION AND EXTENT: Coastal hills of southern California in MLRA 19 and 20 - Southern California Coastal Plain and Mountains. These soils are of limited extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Los Angeles County, California, 2016.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from a depth of 3 to 40 cm
Argillic horizon - the zone from a depth of 40 to 100 cm
Particle-size control section - the zone from a depth of 40 to 90 cm
Some pedons, have a thin mantel human transported material that infrequently exceeds 50 cm in depth.
ADDITIONAL DATA:
NASIS Pedon Site ID: 2015CA6961151
Classified using the Twelfth Edition Keys to Soil Taxonomy (2014)
National Cooperative Soil Survey
U.S.A.