LOCATION LEDGEFORK UT+WYEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Haplocryolls
TYPICAL PEDON: Ledgefork gravelly loamy fine sand, woodland. (Colors are for moist soil unless otherwise noted.)
Al--0 to 7 inches; black (10YR 2/1) very gravelly loamy fine sand, very dark gray (10YR 3/1) dry; weak fine and very fine granular structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; few fine pores neutral (pH 6.7); clear smooth boundary. (2 to 8 inches thick)
A2--7 to 13 inches; very dark brown (10YR 2/2) very gravelly loamy fine sand, dark grayish brown (10YR 4/2) dry; very weak fine granular structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; neutral (pH 6.6); gradual wavy boundary. (4 to 8 inches thick)
C1--13 to 31 inches; brown (7.5YR 4/4) extremely gravelly loamy fine sand, light brown (7.5YR 6/4) dry; massive, parting to single grained; loose, friable, nonsticky and nonplastic; many fine, medium, and coarse roots; slightly acid (pH 6.5); abrupt wavy boundary. (12 to 14 inches thick)
C2--31 to 60 inches; brown (7.5YR 5/4) extremely cobbly fine sand; brown (7.5YR 5/4) dry; massive, parting to single grained; hard and slightly hard, very friable, nonsticky and nonplastic; few fine and medium roots; neutral (pH 6.6).
TYPE LOCATION: Summit County, Utah; 300 yards east of Pinion Canyon road; about 1.5 miles from Main Company road; S1/2 SW1/4 NE1/4 section 23, T.1S., R.6E.
RANGE IN CHARACTERISTICS: The 10 to 40 inch depth is very gravelly or very cobbly loamy fine sand or fine sand with 50 to 90 percent gravel and cobbles. Some stones occur on the surface in some places. Hue is 10YR or 7.5YR. The mean annual soil temperature at depth of 20 inches ranges from 38 to 45 degrees F., and the mean summer soil temperature ranges from 55 to 59 degrees F.
The A horizon has value of 2 or 3 moist, 3 or 5 dry, and chroma of 1 or 2. It ranges from very gravelly loamy fine sand to very gravelly sandy loam or stony loamy fine sand, and has 35 to 60 percent rock fragments. This horizon is neutral or slightly acid, and is 6 to 16 inches thick.
The C horizon has value of 4 or 5 moist, 5 through 7 dry, and chroma of 2 through 4. It ranges from very gravelly or very cobbly loamy fine sand to very gravel or very cobbly fine sand, and has 60 to 90 percent rock fragments. This horizon is neutral or slightly acid.
COMPETING SERIES: There are currently no competitors. The Wiggleton series in a closely related family has a xeric moisture regime.
GEOGRAPHIC SETTING: Ledgefork soils are on mildly dissected, long uniform mountain slopes with gradients Of 25 to 70 percent. Elevations range from 7,500 to 9,000 feet. These soils formed in colluvium derived mainly from quartzite and sandstone. The mean annual temperature is 38 to 45 degrees F., and the mean summer temperature is about 58 degrees F. The average annual precipitation ranges from 25 to 30 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Curbant and Kamack soils. Curbant soils are fragmental and have bedrock at depth of less than 40 inches Kamack soils have very gravelly loam Bw horizons.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; rapid permeability.
USE AND VEGETATION: Used mainly for rangeland, woodland, recreation, water supply and wildlife habitat. The vegetation is dominantly Douglas-fir, Engelmann spruce, and lodgepole pine, with some aspen and brush understory .
DISTRIBUTION AND EXTENT: East-central Utah. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Summit County, Utah, 1976.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon: from 0 to 13 inches (A1 and A2 horizons)
Particle-size control section: The zone from 10 to 40 inches (part of A2, C1, part of C2 horizons)