LOCATION LAG IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Xeric Haplocryolls
TYPICAL PEDON: Lag very cobbly loam - on a north-facing mountain slope of 30 percent on forestland at 7,000 feet elevation. (Colors are for air-dry soil unless otherwise stated. When described on September 19, 1977, the soil was moist throughout.)
Oi--0 to 1 inch; undecomposed needles, cones, and twigs; abrupt smooth boundary. (1/2 to 3 inches thick)
Oe--1 to 2 inches; slightly decomposed needles, cones, and twigs; abrupt smooth boundary. (1/2 to 3 inches thick)
A--2 to 12 inches; dark brown (10YR 4/3) very cobbly loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine interstitial pores; 20 percent gravel and 35 percent cobbles; neutral (pH 6.8); clear wavy boundary. (7 to 15 inches thick)
Bw1--12 to 24 inches; yellowish brown (10YR 5/4) extremely gravelly loam, dark brown (10YR 4/3) moist; weak very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine intersitital pores; 70 percent gravel; neutral (pH 6.8); clear wavy boundary. (6 to 16 inches thick)
Bw2--24 to 37 inches; pale brown (10YR 6/3) extremely gravelly loam, dark brown (10YR 4/3) moist; weak very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; many very fine and fine intersitital pores; 90 percent gravel; neutral (pH 7.0); clear wavy boundary. (8 to 20 inches thick)
C--37 to 63 inches; light brownish gray (10YR 6/2) extremely gravelly loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; many very fine and fine interstitial pores; 90 percent gravel; thin silt accumulations on undersides of some pebbles; neutral (pH 7.2).
TYPE LOCATION: Custer County, Idaho; about 1.2 miles southeast of Bald Mountain; about 2,400 feet north and 1,500 feet east of the southwest corner, sec. 22, T. 12 N., R. 18 E. Latitude - 44 degrees, 21 minutes, 18 seconds north; Longitude - 114 degrees, 19 minutes, 38 seconds west.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 36 to 40 degrees F.
Average summer soil temperature - 45 to 47 degrees F.
Mollic epipedon thickness - 7 to 15 inches
Control section - percent clay 5 to 20
Rock fragments - 35 to 90 percent
Reaction - slightly acid or neutral
A horizon
Hue - 10YR or 7.5YR
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 1 to 4 dry, 1 to 3 moist
Bw horizon
Hue - 10YR or 7.5YR
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 2 to 4, dry and moist
Texture (fine earth) - L, SL
Rock fragments - 35 to 90 percent
C horizon
Hue - 10YR or 2.5Y
Value - 5 to 7 dry, 4 or 5 moist
Chroma - 2 to 4, dry and moist
Texture (fine earth) - L, SL
Rock fragments - 50 to 90 percent
COMPETING SERIES: These are the Antrobus, Basinpeak (T), Broad Canyon, Decram, Fairydell, Farlow, Foxmount, Gaia (T), Grafen, Greyback, Handran, Kamack, Klug, Krackle, Maurice, McCort, Middlehill, Midelight, Midfork, Parachute, Rockabin, Silvercliff, Sup, Supervisor, Surdal, Teemat, Thornburgh, Tiban, Timmercrek, Tineman, Wareagle, Sebud and Vanwirt series. Antrobus soils lack an O horizon and are calcareous throughout. Basinpeak soils lack an O horizon and a MAST of 43 to 47 degrees F and MSST of 54 to 59 degrees F. Broad Canyon soils have a very gravelly loamy sand 2C horizon of 24 to 40 inches. Decram, Foxmount, Grafen, Krackle, Middlehill, Parachute, Rockabin, Supervisor, and Surdal soils have bedrock at 20 to 40 inches. Fairydell and Farlow soils have a calcic horizon. Gaia soils lack an O horizon and a MAST of 41 to 43 degrees F and MSST of 54 to 59 degrees F. Greyback soils have carbonates at depths of 5 to 16 inches. Handran soils lakc an O horizon and a cambic horizon. Kamack soils have bedrock at 40 to 60 inches and a MAST of 42 to 45 degrees F and MSST of 56 to 58 degrees F. Klug soils lack an O horizon. Maurice soils have an ustic soil moisture regime. Midelight soils have bedrock at 40 to 60 inches and rock fragments are channers. Midfork soils have calcareous material of 4 to 15 inches. Silvercliff soils have carbonates, lack an O horizon and have a MAST of 40 to 44 degrees F. Sup soils lack an O horizon and have a MAST of 44 to 47 degrees F and MSST of 53 to 57 degrees F. Teemat soils lack an O horizon and a contineous accumulation of calcium carbonate at 7 to 15 inches. Thornburgh soils lack an O horizon. Tiban soils lack an O horizon and have a MAST of 40 to 45 degrees F and MSST of 50 to 55 degrees F. Tineman soils have very gravelly sand substratum at 26 to 35 inches. Sebud soils lack an O horizon. No description available for McCort and Vanwirt series. Timmercrek soils have lamella of clayey material in the substratum that has a cumulative thicknes sof 1 to 5 inches. Wareagle soils are very similar and need further review for separation.
GEOGRAPHIC SETTING: Lag soils are on mountain sides and have slopes of 4 to 70 percent. Elevations are 5,200 to 9,300 feet. The soils formed in slope alluvium weathered from mixed material. The climate is cold and moist in winter and spring; and cool and dry-to-moist in summer. Average annual precipitation is 20 to 25 inches. Average summer temperature is 50 to 53 degrees F, and average annual temperature is 35 to 41 degrees F. Frost-free period is 30 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the tentative Klug, Custco, and Zeale series. Klug soils lack an O horizon and are moderately alkaline throughout and are on mountains. Custco have an argillic horizon and are on mountains and foothills. Zeale has a calcic horizon within or immediately under the mollic epipedon and are on mountains, foothills, and fan terraces.
DRAINAGE AND PERMEABILITY: Well drained; medium or rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Woodland. Vegetation is mainly an overstory of Douglas fir and pine seedgrass in the understory.
DISTRIBUTION AND EXTENT: East central Idaho; these soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Custer County, Idaho, 1999.
REMARKS: Diagnostic features recognized in this pedon are:
Mollic epipedon - The zone from 2 to 12 inches (A horizon).
Cambic horizon - The zone from 12 to 37 inches (Bw1 and Bw2 horizons)
Xeric soil moisture regime.
The particle-size control section is the zone from 12 to 42 inches (Bw horizons and part of the C horizon).