LOCATION WOODCOCK OR+CA
Established Series
Rev. JSC-AON-TDT-CEG-JTW
01/2020
WOODCOCK SERIES
Landscape--Lava plateaus
Landform--mountain slopes, plateaus, glacial outwash plains, hillslopes, escarpments
Slope--1 to 60 percent
Parent material--colluvium and mudflows from glacial outwash derived from volcanic rocks and volcanic ash
Mean annual precipitation--about 760 mm
Mean annual air temperature--about 6.7 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial-skeletal, amorphic, frigid Alfic Humic Haploxerands
TYPICAL PEDON: Woodcock stony medial loam, in coniferous forest, with a slope of 7 percent, at an elevation of 1230 m; 5 percent surface stones.
Oi--0 to 3 cm; slightly decomposed plant material of needles and twigs
A1--3 to 8 cm; stony medial loam, reddish brown (5YR 4/3) dry, dark reddish brown (5YR 3/2) moist; moderate medium and fine granular structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many fine irregular pores; 5 percent gravel, 5 percent cobbles, and 5 percent stones; neutral (pH 6.8); abrupt smooth boundary
A2--8 to 43 cm; very gravelly medial loam, reddish brown (5YR 4/3) dry, dark reddish brown (5YR 3/2) moist; weak fine and medium granular structure; soft, friable, slightly sticky and slightly plastic; many fine roots; many fine irregular pores; 30 percent gravel and 5 percent cobbles; neutral (pH 7.0); clear smooth boundary
BA--43 to 53 cm; very gravelly medial clay loam, reddish brown (5YR 4/4) dry, dark reddish brown (5YR 3/3) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common medium, fine, and very fine roots; common fine tubular pores; 50 percent gravel and 5 percent cobbles; slightly acid (pH 6.4); clear wavy boundary
Bt1--53 to 84 cm; very gravelly medial clay loam, reddish brown (5YR 4/4) dry, dark reddish brown (5YR 3/4) moist; moderate medium and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common medium and few fine roots; common fine tubular pores; few faint clay films on faces of peds; 50 percent gravel and 5 percent cobbles; slightly acid (pH 6.2); clear smooth boundary
Bt2--84 to 102 cm; very gravelly medial clay loam, reddish brown (5YR 4/4) dry, dark reddish brown (5YR 3/4) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common medium and few fine roots; common fine tubular pores; common faint clay films on faces of peds; 50 percent gravel and 5 percent cobbles; slightly acid (pH 6.1); clear smooth boundary
BC1--102 to 124 cm; gravelly medial clay loam, reddish brown (2.5YR 4/4) dry, dark reddish brown (2.5YR 2.5/4) moist; weak medium and fine subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; few medium roots; common fine tubular pores; 16 percent gravel and 5 percent cobbles; slightly acid (pH 6.1); clear smooth boundary
BC2--124 to 160 cm; gravelly medial clay loam, dusky red (2.5YR 3/2) dry, dark reddish brown (2.5YR 2.5/4) moist; massive; soft, friable, moderately sticky and slightly plastic; few medium roots; few fine tubular pores; 16 percent gravel; moderately acid (pH 5.8)
TYPE LOCATION: Jackson County, Oregon; near the county line with Klamath County, Oregon; about 1,300 feet south and 1,800 feet west of the northeast corner of section 27, T. 39 S., R. 4 E., Willamette Meridian; Little Chinquapin Mountain, Oregon, U.S. Geological Survey quadrangle; latitude 42.1528800 degrees, longitude -122.3329000 degrees, datum WGS 84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
*Mean annual soil temperature--6.6 to 10 degrees C
*Moisture control section--dry for 45 to 60 consecutive days; xeric
*Mollic epipedon thickness--41 to 76 cm
*Andic soil properties--throughout the solum
Estimated Properties
*Volcanic glass content--15 to 30 percent
*Acid oxalate Al+1/2Fe--3 to 5 percent
*P-retention--75 to 100
*15-bar water--13 to 30 percent (dried samples)
*15-bar water--25 to 35 percent (moist samples)
*Acid oxalate extractable silica--2 to 3 percent
Surface Rock Fragments
*Stones--0 to 10 percent surface cover
All mineral horizons
*Base saturation by sum of bases--50 to 75 percent
A and BA horizons
*Hue--5YR through 10YR
*Value--2 or 3 moist, 3 through 5 dry
*Chroma--2 through 4 moist, 1 through 4 dry
*Rock fragments--5 to 50 percent gravel; 0 to 15 percent cobbles and stones; all fragments are subrounded
*Reaction--Slightly acid or neutral
*Organic matter content--5 to 10 percent in the A1 horizon; 1 to 5 percent in the A2 and BA horizons
*Thickness--41 to 76 cm, total combined A and BA horizons
Bt horizons
*Hue--5YR through 10YR.
*Value--2 through 4 moist, 4 through 6 dry.
*Chroma--2 through 4, moist or dry.
*Fine-earth texture--medial clay loam or medial loam
*Clay content--25 to 35 percent much of which is in nondispersible sand-sized aggregates
*Rock fragments--45 to 55 percent gravel; 5 to 20 percent cobbles and stones; all fragments are subrounded
*Reaction--Slightly acid or neutral
*Thickness--38 to 64 cm
BC horizon
*Hue--5YR through 10YR
*Value--2 through 4 moist, 4 through 6 dry
*Chroma--2 through 4, moist or dry
*Fine-earth texture--medial loam, medial clay loam
*Clay content--15 to 30 percent
*Rock fragments--10 to 45 percent gravel; 0 to 10 percent cobbles and stones; all fragments are subrounded
*Reaction--moderately acid or slightly acid
COMPETING SERIES:
There are no competing series.
GEOGRAPHIC SETTING:
Elevation--1155 to 1980 m
Slope--1 to 60 percent
Climate--subhumid-continental with cold, moist winters and cool, dry summers
Mean annual precipitation--455 to 1145 mm
Mean annual air temperature--6.0 to 9.0 degrees C
Mean January air temperature-- -3.3 degrees C
Mean July air temperature--15 degrees C
Frost-free period--60 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Pokegema--medial
Lorella--very gravelly clay argillic horizons; lithic contact at 25 to 50 cm
Mound--argillic horizons averaging 35 to 45 percent clay; less than 35 percent rock fragments
Oatman--cryic
Royst--on associated south-facing slopes; 50 to 100 cm to bedrock; clayey-skeletal
Yawhee--ashy in the upper part of the control section
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--Well drained
Saturated hydraulic conductivity (Ksat)--very high in O horizons; high in A horizons; moderately high to high in Bt and BC horizons
USE AND VEGETATION:
Use--timber production, wildlife habitat, livestock grazing, recreation
Overstory vegetation--mainly white fir, with ponderosa pine, sugar pine, Douglas-fir, and incense cedar
Understory vegetation--western princes pine, western fescue, Oregon boxleaf, common snowberry
DISTRIBUTION AND EXTENT: Southern Oregon and northern California; MLRA 21; extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Modoc County (Alturas Area), California, 1976.
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 3 to 160 cm; averages 43 percent rock fragments
*Mollic epipedon--The zone from 3 to 53 cm (A1, A2, and BA horizons)
*Argillic horizon--The zone from 53 to 102 cm (Bt1 and Bt2 horizons)
*Andic soil properties--based on laboratory data from the similar Oatman and Tater soils
ADDITIONAL DATA:
*NASIS Site ID--1989OR029001
*NASIS Pedon ID--1989OR029001
2007--type location was moved to an area where the ecological site was more representative (in Jackson County, OR, at the TUD pedon location in the OR632 soil survey area)
2010--current OSD type location (in Jackson County, OR) was visited, and based on current ecological site correlations to soil climate the series was reclassified to frigid from cryic; classification was changed from Loamy-skeletal, mixed, Arigic Pachic Cryoboralls to Medial-skeletal, amorphic, frigid, Alfic Humic Haploxerands.
07/2017--Updated this official series description according to SSRO1 Technical Note 11, OSD--Content and Format of Official Series Descriptions (revised 12/2015). Most of the changes were in formatting, with some changes to climate data..
2020--Defined this series as very deep (versus deep and very deep, as it was originally described), based on soil survey manuscripts and field documentation.
National Cooperative Soil Survey
U.S.A.