LOCATION LATIGOCREEK OR
Tentative Series
IRD. JRD/DAL
02/2025
LATIGOCREEK SERIES
Landscape--mountains
Landform--mountain slopes
Slope--10 to 40 percent
Parent material--colluvium and residuum derived from marine sediments with an influence of volcanic ash in the surface
Mean annual precipitation--about 660 mm
Mean annual air temperature--about 5 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Vitrandic Argixerolls
TYPICAL PEDON: Latigocreek ashy sand -- upland forest, on a 15 to 30 percent convex slope, west aspect, at 1,770 m elevation. (Colors are for dry soil unless otherwise noted; apparent field textures.)
Oi--0 to 3 centimeters; slightly decomposed Ponderosa pine litter.
A1--3 to 8 centimeters; dark brown (10YR 3/3) ashy loamy sand, very dark brown (10YR 2/2) moist; weak thin and medium platy structure; very soft, very friable, nonsticky and nonplastic; common fine, medium and coarse roots; many very fine and fine irregular pores; 5 percent channers; moderately acid (pH 6.0); abrupt smooth boundary.
A2--8 to 20 centimeters; dark brown (10YR 4/3) channery ashy loamy sand, very dark grayish brown (10YR 3/2) moist; weak thin and medium platy structure; very soft, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots; many very fine and fine irregular pores; 10 percent channers; 5 percent flagstones; moderately acid (pH 6.0); abrupt smooth boundary. (The combined thickness on the A horizons ranges from 7 to 12 inches)
2Bt1--20 to 30 centimeters; dark brown (10YR 4/3) extremely channery sandy clay loam, very dark grayish brown (10YR 3/2) moist; strong fine and medium angular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common medium, coarse and very coarse roots; common very fine and fine irregular and interstitial pores; few, faint clay films on ped faces; 40 percent channers, 20 percent flagstones; moderately acid (pH 6.0); clear wavy boundary. (4 to 8 inches thick)
2Bt2--30 to 43 centimeters; dark brown (10YR 4/3) extremely channery sandy clay, dark yellowish brown (10YR 3/3) moist; weak fine and medium angular blocky structure; hard, firm, sticky and plastic; few fine and medium roots; few very fine and fine interstitial pores; many distinct clay films on ped faces and lining pores; 50 percent channers, 25 percent flagstones; moderately acid (pH 6.0) clear smooth boundary. (4 to 10 inches thick)
2Bt3--43 to 66 centimeters; dark yellowish brown (10YR 4/4) extremely channery sandy clay, dark brown (10YR 3/3) moist; weak fine and medium angular blocky structure; hard, firm, sticky and plastic; few fine and medium roots; few very fine and fine interstitial pores; many distinct clay films on ped faces and rock faces; 50 percent channers, 25 percent flagstones; moderately acid (pH 6.0) abrubt smooth boundary. (6 to 9 inches thick)
2R--66 cm; sedimentary rock
TYPE LOCATION: Harney County, Oregon, on forest road 4357-200; Section 9, T.19 S, R.27 E.; latitude 43.9376938, longitude -119.4820142. WGS84 Datum (Coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--2 to 6 degrees C
Soil moisture--usually moist, dry for 45 to 60 days in summer and early fall
Mollic epipedon--33 to 75 cm thick
Depth to lithic contact--50 to 100 cm
Properties of layers influenced by volcanic ash
*Ash influenced layer thickness--18 to 30 cm
*Ammonium oxalate extractable Al + Fe--0.4 to 1.0 percent
*Volcanic glass content--15 to 30 percent
Particle-size Control Section
*Clay content (weighted average)--35 to 55 percent
*Total rock fragment content--35 to 85 percent
*Rock fragment type-marine sediments dominated by shales, argillite, and sandstones, mostly of the Baker Terrane, some pedons may contain colluvial fragments from igneous sources
A horizons
*Hue--10YR moist or dry
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist, 2 to 4 dry
*Fine earth texture--loamy sand, sandy loam
*Clay content--5 to 18 percent
*Sand content--60 to 90 percent
*Organic matter content--1 to 4 percent
*Total rock fragments content--5 to 15 percent
*Channers-0 to 15 percent
*Flagstones-0 to 5 percent
*Reaction--moderately or slightly acid
*Thickness--18 to 30 cm thick
2Bt horizons
*Hue--10YR moist or dry
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 to 4 moist, 3 to 4 dry
*Fine earth texture--sandy clay loam, sandy clay
*Clay content--30 to 55 percent
*Sand content--45 to 70 percent
*Organic matter content-1.0 to 1.5 in upper argillic, 0.5 to 1.0 percent in lower
*Total rock fragments content--35 to 85 percent
*Channer content--25 to 50 percent
*Flagstone content--10 to 35 percent
*Stone content--0 to 5 percent
*Reaction--moderately or slightly acid
*Thickness--36 to 70 cm thick
COMPETING SERIES:
Dupratt--50 to 100 cm to lithic contact; lacks flat coarse fragments
Erakatak--50 to 100 cm to lithic contact; lacks flat coarse fragments; lacks organic horizon
Finsel--50 to 100 cm to lithic contact; lacks flat coarse fragments; lacks organic horizon
Hamtah--greater than 150 cm to restrictive feature; lacks flat coarse fragments; dry for 45 days following summer solstice
Home Camp--50 to 100 cm paralithic tuffaceous contact; lacks flat coarse fragments; lacks organic horizon
Humarel--50 to 100 cm to lithic tuff contact; lacks flat coarse fragments; dry 60 to 90 days
Lamulita--50 to 100 cm to lithic tuff contact; lacks flat coarse fragments; dry 45 to 60 days
Maule--50 to 100 cm to paralithic tuff contact; lacks flat coarse fragments; dry 60 to 90 days; Mollic epipedon 50 to 100 cm thick
Menbo--50 to 100 cm to lithic basalt contact; lacks flat coarse fragments; lacks organic horizon; dry for 100 to 120 days
Shotsprings--50 to 100 cm to lithic basalt contact; lacks flat coarse fragments; dry 45 to 60 days
Squatterflat--greater than 150 cm to restrictive feature; lacks flat coarse fragments
Wiltop--100 to 150 cm to lithic tuff contact; lacks flat coarse fragments; lacks organic horizon
GEOGRAPHIC SETTING:
Elevation--1220 to 1830 m
Climate--cold, wet winters and hot, dry summers
Mean annual precipitation--500 to 660 mm
Mean annual air temperature--4 to 7 degrees C
Frost-free period--45 to 85 days
Landform: mountain backslopes and ridges
Lithology--Sedimentary rock, mudstone and siltstone, mostly associated with the Baker Terrane
GEOGRAPHICALLY ASSOCIATED SOILS:
Dobsonspring--occur on mountain slopes; 50 to 100 cm to bedrock; under
Douglas fir,
Ponderosa pine, pinegrass and elk sedge
Laycock--occur on hillslopes; 25 to 100 cm to bedrock; under
Douglas fir,
Ponderosa pine, western juniper, mahogany, mountain big sage, elk sedge and pinegrass
Moeo--occur on mountain sideslopes and benches; 25 to 50 cm to bedrock; under Grand-fir, ponderosa pine, elk sedge and western needlegrass
Muttoncamp--occur on plateau tops and mountain sideslopes; 50 to 100 cm to lithic contact; under
Douglas fir, ponderosa pine, western juniper, Idaho fescue, mahogany, elk sedge and pinegrass
Volspring--occur on sideslopes and benches; greater than 150 cm to restrictive feature; 36 to 50 cm of volcanic ash mantel; under grand fir,
Douglas-fir, ponderosa pine, pinegrass and elk sedge
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately low
USE AND VEGETATION:
Use--timber production, range, wildlife habitat and water supply
Potential native vegetation--Douglas-fir, ponderosa pine, mahogany, pinegrass and elk sedge
DISTRIBUTION AND EXTENT: Central Oregon, Southern Blue and Ochoco Mountains, MLRA 43C. These soils are not extensive
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Harney County, Ochoco National Forest, Oregon, 2004.
REMARKS:
Diagnostic horizons and features recognized in this pedon are
*Vitrandic subgroup properties--3 to 20 cm
*Mollic epipedon--3 to 66 cm
*Argillic horizon--20 to 66 cm
*Lithic contact-- 66 cm
*Plant Association: CDG-112, Douglas fir, Ponderosa pine, pinegrass and elk sedge. (Hall, 1989, Plant Association and Management Guide for the Ochoco and Southern Blue Mountain Areas)
Plant Association Group: Doug Fir (moist)
National Cooperative Soil Survey
U.S.A.