LOCATION MOGG ID
Established Series
Rev. GAH/DJJ/CLM/RGK
05/2018
MOGG SERIES
Landscape--hills, foothills, mountains
Landform--hillslopes, mountain slopes, ridges
Slope--1 to 40 percent
Parent material--colluvium derived from igneous rock
Mean annual precipitation--about 250 mm
Mean annual air temperature--about 5 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--frigid
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Lithic Xeric Haplocalcids
TYPICAL PEDON: Mogg very gravelly loam in an area of rangeland (Colors are for dry soil unless otherwise noted.)
A--0 to 5 cm; pale brown (10YR 6/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and few fine roots; many very fine irregular and vesicular pores; 25 percent gravel, 10 percent cobbles, and 10 percent flagstones; slightly alkaline (pH 7.4); clear wavy boundary
Bw--5 to 13 cm; pale brown (10YR 6/3) very gravelly loam, dark brown (10YR 3/3) moist; weak very fine subangular blocky structure parting to moderate fine and medium granular; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; many very fine irregular pores; 35 percent gravel; slightly alkaline (pH 7.8); abrupt wavy boundary
Bk1--13 to 23 cm; pale brown (10YR 6/3) very gravelly loam, brown (10YR 4/3) moist; moderate very fine and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine irregular pores; common calcium carbonate and silica coatings on rock fragments; 35 percent gravel and 10 percent cobbles; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary
Bk2--23 to 36 cm; light yellowish brown (10YR 6/4) extremely gravelly loam, brown (10YR 4/3) moist; moderate very fine and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine irregular pores; common calcium carbonate and silica coatings on rock fragments; 55 percent gravel and 15 percent cobbles; violently effervescent; moderately alkaline (pH 8.2); abrupt wavy boundary
R--36 cm; extrusive igneous rock
TYPE LOCATION: Custer County, Idaho; latitude 44.73522 degrees north, longitude 114.049832 degrees west, datum WGS 84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4.4 to 7.8 degrees C
Depth to bedrock--30 to 50 cm
Depth to calcic horizon--5 to 20 cm
Particle-size control section (weighted averages)
Clay content--8 to 20 percent
Total rock fragment content--45 to 70 percent
A horizon
Value--5 or 6 dry, 3 or 4 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--loam, silt loam
Clay content--10 to 20 percent
Total rock fragment content--20 to 50 percent
Gravel content--20 to 45 percent
Cobble or channer content--0 to 15 percent
Stone or flagstone content--0 to 10 percent
Calcium carbonate equivalent--0 to 10 percent
Reaction--pH 7.4 to 8.4
Thickness--5 to 10 cm
Bw horizon
Value--5 or 6 dry, 3 or 4 moist
Chroma--2 or 3 dry or moist
Clay content--15 to 25 percent
Total rock fragment content--20 to 55 percent
Gravel content--20 to 45 percent
Cobble or channer content--2 to 15 percent
Stone or flagstone content--2 to 10 percent
Calcium carbonate equivalent--0 to 10 percent
Reaction--pH 7.4 to 8.4
Thickness--0 to 10 cm
Bk or Bkq horizon
Value--5 to 8 dry, 3 to 6 moist
Chroma--3 or 4 dry or moist
Clay content--8 to 25 percent
Total rock fragment content--35 to 85 percent
Gravel content--20 to 75 percent
Cobble or channer content--0 to 35 percent
Stone or flagstone content--3 to 35 percent
Calcium carbonate equivalent--5 to 35 percent
Reaction--pH 7.9 to 8.4
Thickness--16 to 31 cm
COMPETING SERIES:
Mullhop--weighted average of less than 15 percent calcium carbonate equivalent in Bk horizon
GEOGRAPHIC SETTING:
Elevation--1370 to 2290 m
Mean annual precipitation--200 to 425 mm
Mean annual air temperature--3.3 to 7.0 degrees C
Frost-free period--60 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 50 um/sec
USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--Wyoming big sagebrush, black sagebrush, bluebunch wheatgrass, Salmon wildrye, needle and thread, phlox, prickly pear cactus
DISTRIBUTION AND EXTENT: Small extent in east-central Idaho; MLRAs 12 and 13
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Custer County, Idaho; 1999
REMARKS:
Diagnostic horizons and other features recognized in this pedon
Ochric epipedon
Calcic horizon--zone from 13 to 36 cm (Bk1 and Bk2 horizons)
Depth to lithic contact--36 cm
Particle-size control section--zone from the surface to a depth of 36 cm (A, Bw, Bk1, and Bk2 horizons)
Taxonomic version--Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.