LOCATION MONIDA IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Calcic Argicryolls
TYPICAL PEDON: Monida silt loam; supporting a mountain big sagebrush/Idaho fescue plant association, rangeland; on a 17 percent slope with a south aspect at 6625 feet elevation. (Colors are for dry soil unless otherwise noted.)
A1--0 to 2 inches; very dark grayish brown (10YR 3/2) silt loam, very dark brown (10YR 2/2) moist; weak medium granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine irregular pores; slightly alkaline (pH 7.4); abrupt smooth boundary
A2--2 to 7 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; moderate very coarse subangular blocky structure parting to medium subangular blocky; hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; few fine and medium tubular pores; slightly alkaline (pH 7.6); clear smooth boundary. (Combined thickness of the A horizon is 4 to 12 inches)
Bt1--7 to 12 inches; grayish brown (2.5Y 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate very coarse subangular blocky structure parting to fine subangular blocky; hard, firm, slightly sticky and moderately plastic; few very fine and common fine roots; few fine and medium tubular pores; many distinct clay films very dark brown (10YR 2/2) moist on faces of ped and lining pores; slightly alkaline (pH 7.6); clear smooth boundary. (3 to 8 inches thick)
Bt2--12 to 27 inches; light olive brown (2.5Y 5/3) clay loam, olive brown (2.5Y 4/3) moist; strong medium prismatic structure parting to medium subangular blocky; hard, friable, slightly sticky and moderately plastic; few very fine and medium, and common fine roots; common fine tubular pores; many distinct clay films dark grayish brown (10YR 4/2) moist on ped faces and lining pores; slightly alkaline (pH 7.6); gradual smooth boundary. (0 to 20 inches thick)
Btk--27 to 38 inches; pale yellow (2.5Y 7/3) loam, light olive brown (2.5Y 5/3) moist; weak coarse prismatic structure parting to moderate coarse subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many fine tubular pores; common distinct clay films olive brown (2.5Y 4/3) on faces of ped and lining pores; common filaments and few fine (less than 5 mm) masses of soft powdery lime in matrix; strongly effervescent; moderately alkaline (pH 8.0); gradual smooth boundary. (0 to 15 inches thick)
Bk--38 to 60 inches; pale yellow (2.5Y 7/3) loam, light olive brown (2.5Y 5/3) moist; weak coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many fine tubular pores; common filaments and few fine (less than 5 mm) masses of soft powdery lime in matrix; violently effervescent; moderately alkaline (pH 8.0); gradual smooth boundary.
TYPE LOCATION: Clark County, Idaho; about 8 miles north of Spencer, Idaho; about 2225 feet south and 450 feet west of the northeast corner of sec. 7, T. 13 N., R. 37 E. Latitude: 44 degrees North, 28 minutes, 08 seconds. Longitude: 112 degrees West, 08 minutes, 33 seconds.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 37 to 44 degrees F.
Mean summer soil temperature - 46 to 54 degrees F.
Soil moisture - Dry in all parts of the moisture control section for 45 to 100 consecutive days during the four months following the summer solstice (Xeric).
Mollic epipedon thickness - 7 to 16 inches.
Depth to secondary carbonates - 7 to 30 inches
Depth to base of argillic horizon - 15 to 50 inches
Depth to calcic horizon - 15 to 40 inches
Clay in particle size control section, weighted average - 18 to 35 percent
Fine sand or coarser in the particle size control section, weighted average - 15 to 35 percent
A horizon:
Hue - 2.5Y through 7.5YR
Value - 3 through 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry; 1 through 3 moist
Reaction - neutral to slightly alkaline
Bt horizon:
Hue - 2.5Y through 7.5YR
Value - 5 through 7 dry, 3 through 6 moist
Chroma - 2 through 6 dry or moist
Texture, less than 2 mm fraction - silty clay loam or clay loam
Rock fragments - 0 to 25 percent
Reaction - slightly alkaline or moderately alkaline
Btk horizon:
Hue - 2.5Y through 7.5YR
Value - 5 through 8 dry, 4 through 6 moist
Chroma - 1 through 4 dry, 2 through 4 moist
Texture, less than 2 mm fraction - loam,silt loam, silty clay loam
Rock fragments - 0 to 35 percent
Effervescence - slightly effervescent or strongly effervescent
Calcium carbonate equivalent - 5 to 15 percent
Reaction - slightly alkaline or moderately alkaline
Bk horizon:
Hue - 2.5Y through 7.5YR
Value - 5 through 8 dry, 4 through 7 moist
Chroma - 1 through 4 dry, 2 through 4 moist
Texture, less than 2 mm fraction - loam, silt loam, very fine sandy loam or sandy loam
Rock fragments - 0 to 50 percent, dominantly gravel
Effervescence - strongly effervescent or violently effervescent
Calcium carbonate equivalent - 15 to 40 percent
COMPETING SERIES: These are the Accola, Madigan (T), Michelson, Morset, Oro Fino and Philipsburg series. The Accola, Madigan, Michelson, Morset, Oro Fino and Philipsburg soils have ustic moisture regimes.
GEOGRAPHIC SETTING: The Monida soils are on fan remnants, foothills and mountains. Slopes range from 4 to 45 percent. Elevations range from 6,000 to 9,600 feet. The soil formed in local alluvium or colluvium derived from calcareous siltstone, sandstone and loess. The mean annual precipitation is 14 to 19 inches. It falls dominantly in the late autumn through early summer. A winter snowpack of 1 to 3 feet lasting through March is common. Summers are warm and dry. The mean annual air temperature is 37 to 40 degrees F. The frost free season is 30 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Meegero, Zeale and Zeebar series. Each of these soils have greater than 35 percent rock fragments in the particle-size control section. Meegero soils occur intermixed with Monida soils on foothills and mountains. They have a mollic epipedon greater than 16 inches thick, lack an argillic horizon and have greater than 40 percent calcium carbonate equivalent in the particle-size control section. Zeale and Zeebar soils occur intermixed with Monida soils on fan remnants. Zeale soils lack an argillic horizon and have greater than 40 percent calcium carbonate equivalent in the particle size control section. Zeebar soils lack accumulations of secondary carbonates.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Monida soils are used for livestock grazing, recreation and wildlife habitat. These soils dominantly support a mountain big sagebrush/Idaho fescue plant association.
DISTRIBUTION AND EXTENT: Southcentral Idaho. The soil is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Targhee National Forest, Clark County, Idaho, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the mineral soil surface to 12 inches (the A1, A2 and Bt1 horizons).
Argillic horizon - the zone from 7 to 38 inches (the Bt1, Bt2 and Btk horizons).
Calcic horizon - the zone from 38 to 60 inches (Bk horizon).
Particle-size control section - the zone from 7 to 27 inches (the Bt1 and Bt2 horizons).
Moisture regime - xeric.
02/2008: Classification updated from the 8th to the 10 Edition of Soil Taxonomy and changed from Xeric Argicryolls to Calcic Argicryolls.