LOCATION KADYGULCH MT+WY
Established Series
Rev. EMZ/TJK/KLS
03/2022
KADYGULCH SERIES
The Kadygulch series consists of very deep, well drained soils that formed in colluvium and slope alluvium from coarse- and fine-grained igneous rock. These soils are on alluvial fans, escarpments, hills and mountains. Slopes are 35 to 60 percent. Mean annual precipitation is about 43 cm, and mean annual air temperature is about 4 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Haplustepts
TYPICAL PEDON: Kadygulch gravelly loam, forested (colors are for dry colors unless otherwise noted).
Oi--0 to 5 cm; partially decomposed twigs and needles. (3 to 10 cm thick)
A--5 to 15 cm; very dark grayish brown (10YR 3/2) gravelly loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, friable, slightly sticky and slightly plastic; many fine and common medium and coarse roots; many very fine and fine and common medium pores; 20 percent pebbles; slightly acid (pH 6.4); clear smooth boundary. (5 to 15 cm thick)
E--15 to 33 cm; pale brown (10YR 6/3) very gravelly coarse sandy loam, brown (10YR 5/3) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; commom fine and medium and few coarse roots; many very fine and common fine and medium pores; 40 percent pebbles; slightly acid (pH 6.2); abrupt smooth boundary. (10 to 30 cm thick)
Bw1--33 to 53 cm; light yellowish brown (10YR 6/4) very gravelly coarse sandy loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and few coarse roots; common very fine, fine and medium pores; 35 percent pebbles; moderately acid (pH 5.6); clear wavy boundary.
Bw2--53 to 91 cm; very pale brown (10YR 7/4) very gravelly sandy clay loam, yellowish brown (10YR 5/6) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; few fine, medium and coarse roots; common very fine, fine and medium pores; 55 percent pebbles; strongly acid (pH 5.4); clear wavy boundary. (Combined thickness of Bw horizons is 45 to 80 cm).
BC--91 to 157 cm; brownish yellow (10YR 6/6) extremely gravelly coarse sandy loam, yellowish brown (10YR 5/4) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and moderately plastic; few fine, medium and coarse roots; common very fine, fine and medium pores; 10 percent cobbles; 55 percent pebbles; strongly acid (pH 5.2).
TYPE LOCATION: Jefferson County, Montana; about 580 meters north and 365 meters west of the SE corner of sec. 14, T. 7 N., R. 4 W.
RANGE IN CHARACTERISTICS:
Soil temperature--3 to 7 degrees C
Moisture control section--between 10 and 30 cm
Rock fragment content--0 to 3 percent surface stones or boulders
A horizon
Value--3 or 4 dry; 2 or 3 moist
Chroma--2 or 3
Clay content--15 to 25 percent
Rock fragments--15 to 35 percent; 0 to 10 percent cobbles and stones; 15 to 25 percent pebbles
Reaction--pH 6.1 to 7.3
E horizon
Value--6 or 7 dry; 4 or 5 moist
Chroma--2 or 3
Texture--sandy loam, coarse sandy loam, or sandy clay loam
Clay content--15 to 25 percent
Rock fragments--15 to 45 percent; 0 to 10 percent cobbles and stones; 15 to 40 percent pebbles
Reaction--pH 6.1 to 7.3
Bw horizons
Value--5 through 7 dry; 4 through 6 moist
Chroma--3, 4 or 6
Texture--sandy loam, coarse sandy loam, or sandy clay loam
Clay content--18 to 30 percent
Rock fragments--35 to 60 percent; 0 to 20 percent cobbles and stones; 30 to 55 percent pebbles
Reaction--pH 5.1 to 6.5
BC horizon
Value--6 through 8 dry; 4 through 6 moist
Chroma: 4 or 6
Texture: loamy sand, loamy coarse sand, sandy loam, or coarse sandy loam
Clay content: 5 to 18 percent
Rock Fragments: 35 to 70 percent; 5 to 25 percent cobbles and stones; 30 to 55 percent pebbles
Reaction: pH 5.1 to 6.5
COMPETING SERIES:
Kingspoint (MT) - has carbonates above 100 cm
Lamedeer (MT) - has carbonates above 100 cm
Mowbray (MT) - has carbonates above 100 cm
Redfist (MT) - has a lithic contact at 50 to 100 cm
Repkie (MT) - has less than 18 percent clay throughout; is somewhat excessively drained
Repp (MT) - has horizons of calcium carbonate accumulation
Specie (CO) - has carbonates above 64 cm
Wilde (MT) - has a lithic contact at 50 to 100 cm
Wildgen (MT) - contains lamellae
Willspring (MT) - has lithic contact at 50 to 100 cm; has horizon of secondary carbonate accumulation
Winkler (MT) - contains lamellae; is somewhat excessively drained; has more than 60 percent rock fragments in the control section
GEOGRAPHIC SETTING:
Landform--alluvial fans, hills, escarpments and mountains
Elevation--1,340 to 1,770 meters
Slope--35 to 60 percent
Parent material--colluvium and slope alluvium derived from fine and coarse grained igneous rocks
Climate--long, cold winters; moist springs; warm summers
Mean annual precipitation--380 to 480 mm
Mean annual air temperature--2 to 6 degrees C
Frost-free period--70 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND PERMEABILITY: Well drained, moderate permeability
USE AND VEGETATION: Kadygulch soils are primarily used for timber production, watershed, and wildlife habitat. The potential native vegetation is mainly Douglas-fir and ponderosa pine with an understory of common snowberry, pinegrass, and white spiraea.
DISTRIBUTION AND EXTENT: Kadygulch soils are of moderate extent in western Montana and northwestern Wyoming; MLRAs 43A, 43B, 44A
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Jefferson County, Montana, 1998
REMARKS: Soil interpretation record: MT1502. Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon--5 to 33 cm (A and E horizons)
Cambic horizon--33 to 91 cm (Bw1 and Bw2 horizons)
Particle-size control section--25 to 100 cm (E, Bw1, Bw2 and BC horizons)
Kadygulch soils have a frigid temperature regime and an ustic moisture regime.
Converted to metric and O horizons were updated to start at zero. 2/2022
National Cooperative Soil Survey
U.S.A.