LOCATION JIMBEE IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, carbonatic Lithic Calcicryolls
TYPICAL PEDON: Jimbee gravelly loam--on a 30 percent convex, north-facing slope in rangeland at 6,400 feet elevation. (Colors are for dry soil unless otherwise noted. When described on August 18, 1986, the soil was slightly moist throughout.)
A1--0 to 3 inches; grayish brown (10YR 5/2) gravelly loam, dark brown (10YR 3/3) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and common fine roots; many very fine irregular pores; 20 percent gravel, 5 percent cobbles; strongly effervescent (45 percent calcium carbonate equivalent); moderately alkaline (pH 8.0); clear smooth boundary. (2 to 8 inches thick)
A2--3 to 6 inches; brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine, common fine and few medium roots; common very fine tubular pores; 20 percent gravel, 5 percent cobbles; strongly effervescent (50 percent calcium carbonate equivalent); moderately alkaline (pH 8.0); clear wavy boundary. (0 to 5 inches thick)
Bkq1--6 to 9 inches; brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; many very fine, common fine and few medium roots; common very fine tubular pores; 30 percent gravel, 5 percent cobbles; prominent lime and silica coatings and pendants on undersides of coarse fragments; violently effervescent (55 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary. (2 to 7 inches thick)
Bkq2--9 to 16 inches; very pale brown (10YR 7/3) very gravelly loam, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and few fine roots; common very fine tubular pores; 35 percent gravel, 5 percent cobbles; prominent lime and silica coatings and pendants on undersides and sides of coarse fragments; violently effervescent (55 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); abrupt wavy boundary. (5 to 8 inches thick)
R--16 inches; hard limestone.
TYPE LOCATION: Custer County, Idaho; about 4 miles south/southwest of Mackay, Idaho; about 2,000 feet east and 100 feet north of the southwest corner of section 18, T. 6 N., R. 25 E. Latitude - 43 degrees, 50 minutes, 27 seconds North; Longitude - 113 degrees, 31 minutes, 52 seconds west.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 37 to 42 degrees F.
Average summer soil temperature - 45 to 48 degrees F.
Mollic epipedon thickness - 7 to 12 inches
Depth to calcic horizon - 2 to 7 inches
Depth to hard bedrock - 10 to 20 inches
Control section - percent clay: 12 to 22
Rock fragments - 35 to 60 percent
Calcium carbonate equivalent - 40 to 55 percent
A horizon
Value - 3 through 5 dry and 2 or 3 moist
Chroma - 2 or 3 dry and moist
Bkq horizon
Value - 5 through 7 dry and 3 through 7 moist
Chroma - 3 or 4 dry and moist
Texture - GRV-L, GRV-SL, STV-L
Reaction - moderately or strongly alkaline
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Jimbee soils are on ridges, foothills and mountains. These soils formed in slope alluvium and colluvium from limestone. Slopes are 10 to 75 percent. Elevations are 5,500 to 9,000 feet. The climate is cold and moist in winter and spring and cool and dry in summer. Average annual precipitation is 11 to 13 inches; average annual temperature is 36 to 40 degrees F. The frost-free period is 10 to 65 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Simeroi, and Sparmo soils. Simeroi and Sparmo soils are on fan terraces and are very deep.
DRAINAGE AND PERMEABILITY: Well drained. Medium and rapid runoff. Moderate permeability.
USE AND VEGETATION: Rangeland. Vegetation is mainly low sagebrush and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: East-central Idaho. These soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Custer County, Idaho, 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to 9 inches (A1, A2, and Bkq1 horizons).
Calcic horizon - The zone from 6 to 16 inches (Bkq1 and Bkq2 horizons).
Particle-size control section - The zone from 10 inches to the lithic contact (part of the Bkq2 horizon).