LOCATION LOSTPETE IDEstablished Series
TAXONOMIC CLASS: Medial over loamy, amorphic over mixed, active, frigid Alfic Udivitrands
TYPICAL PEDON: Lostpete medial silt loam, forested, on a 29 percent slope at 3,750 feet elevation. Aspect is northeast.(Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed needles, twigs and leaves.
Oe--1 to 1.5 inches; well decomposed needles, twigs and leaves.
A--1.5 to 5 inches; dark yellowish brown (10YR 4/4) medial silt loam, dark brown (7.5YR 3/3) moist; weak fine granular structure; soft, very friable, slightly sticky and nonplastic; many very fine and common fine and medium roots; many very fine and fine, and few medium irregular pores; 5 percent fine iron-manganese concretions; moderately acid (pH 6.0); abrupt wavy boundary. (2 to 8 inches thick)
Bw1--5 to 13 inches; yellowish brown (10YR 5/4) medial silt loam, dark brown (7.5YR 3/4) moist; weak very fine and fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine, common fine and medium, and few coarse roots; many very fine, common fine, and few medium irregular pores; 3 percent fine iron-manganese concretions; slightly acid (pH 6.2); clear wavy boundary. ( 4 to 8 inches thick)
Bw2--13 to 19 inches; yellowish brown (10YR 5/4) medial silt loam, dark brown (7.5YR 3/4) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; many very fine, common fine and few medium and coarse roots; common very fine and few fine irregular, and common very fine tubular pores; 3 percent fine iron-manganese concretions; slightly acid (pH 6.2); abrupt wavy boundary. (3 to 11 inches thick)
2Bt1--19 to 29 inches; light yellowish brown (10YR 6/4) silt loam, strong brown (7.5YR 4/6) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; many very fine and few fine tubular pores; few faint clay films in pores and on faces of peds; 2 percent fine mica flakes; slightly acid (pH 6.2); clear wavy boundary. (4 to 12 inches thick)
2Bt2-- 29 to 42 inches; very pale brown (10YR 7/4) silt loam, brown (7.5YR 4/4) moist; weak coarse prismatic structure parting to moderate coarse subangular blocky; hard, friable slightly sticky and slightly plastic; common very fine and few fine roots; many very fine and few fine and medium tubular pores; common faint clay films in pores and on faces of peds; many distinct very pale brown (10YR 7/4) uncoated silt grains in pores and on faces of peds; 10 percent fine mica flakes; moderately acid (pH 6.0) diffuse wavy boundary. (5 to 16 inches thick)
2Bt3--42 to 52 inches; light brown (7.5YR 6/4) silt loam, brown (7.5YR 4/4) moist; weak coarse prismatic structure parting to moderate coarse subangular blocky; hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine and few fine and medium pores; many distinct clay films in pores and on faces of peds; few faint very pale brown (10YR 7/4) uncoated silt grains in pores and on faces of peds; 3 percent fine mica flakes; moderately acid (pH 6.0); diffuse wavy boundary. (7 to 11 inches thick)
2Bt4--52 to 61 inches; light brown (7.5YR 6/4) silt loam, brown (7.5YR 4/4) moist; weak coarse prismatic structure parting to moderate medium and coarse subangular; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine and few fine and medium tubular pores; common faint clay films in pores and on faces of peds; few faint very pale brown (10YR 7/4) uncoated silt grains in pores and on faces of peds; 5 percent fine mica flakes; moderately acid (pH 5.8); diffuse wavy boundary. (5 to 19 inches thick)
2Bt5--61 to 66 inches; light brown (7.5YR 6/4) silt loam, strong brown (7.5YR 4/6) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine and few fine tubular pores; common faint clay films in pores and on faces of peds; 2 percent fine mica flakes; moderately acid (pH 5.6).
TYPE LOCATION: Clearwater County, Idaho; about 12 miles northeast of Headquarters, Idaho; about 1,150 feet south and 850 feet west of the northeast corner, Section 22, T. 40 N., R. 6 E. Latitude - 46 degrees, 48 minutes, 01 seconds North; Longitude - 115 degrees, 40 minutes and 59 seconds West. USGS Thompson Point quadrangle.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 43 to 46 degrees F.(frigid temperature regime)
Soil moisture - usually moist year round and not dry for 45 or more consecutive days from June to October. (Udic moisture regime)
Thickness of volcanic ash mantle - 14 to 20 inches
Volcanic glass content - 15 to 50 percent
Acid-oxalate extractable Al plus 1/2 Fe - 1.3 to 2.7 percent
Phosphate retention - 55 to 95 percent
15 bar water retention on air dried samples - 8 to 16 percent
A horizon
Hue - 7.5YR or 10YR
Value - 4 to 6 dry and 2 to 3 moist
Chroma - 2 through 4 dry or moist
Clay content - 8 to 12 percent
Iron-manganese nodule content - 0 to 5 percent
Bulk density - 0.55 to 0 85 g/cc
Reaction - strongly or moderately acid
Bw horizons
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 2.5 to 5 moist
Chroma - 3 to 6 dry, 3 to 8 moist
Textures - Medial_sil, Medial-L
Clay content - 7 to 14 percent
Rock fragments - 0 to 3 percent gravel
Iron-manganese nodule content - 0 to 6 percent
Bulk density - 0.65 to 1.00 g/cc
Reaction - strongly acid to slightly acid
2Bt horizons
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 2 to 6 dry or moist
Texture - L, SIL, or SICL
Clay content - 12 to 30 percent; control section averages greater than 18 percent
Mica content - 1 to 30 percent
Reaction - very strongly acid to slightly acid
COMPETING SERIES: These are the Lado, Odonnell, and Spacecreek series. Lado soils have 3Bt horizons. Odonnell soils have transitional 2Bt/E and 2E/Btb horizons. Spacecreek soils are moderately well drained with redox concentrations at 28 inches.
GEOGRAPHIC SETTING: Lostpete soils are on mountain slopes, benches, and ridges at elevations of 1,900 to 4,600 feet, with slopes of 10 to 40 percent. These soils formed in loess with a thick mantle of volcanic ash. The average annual temperature is 38 to 44 degrees F. and the average annual precipitation is 30 to 55 inches. The frost free period is 50 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bouldercreek, Brodeer, Jury, and Rettig series. Bouldercreek soils are on mountain slopes and ridges and are skeletal. Brodeer soils are on mountain slopes and have ashy over loamy particle size control sections. Jury and Rettig soils are on mountain backslopes and lack an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderate permeability.
USE AND VEGETATION: The soils are used for timber production, wildlife habitat, recreation and watershed. Potential natural vegetation is western redcedar, grand fir, Douglas-fir, western white pine and western larch with an understory of wild ginger, longtube twinflower, bunchberry dogwood, goldthread, queencup beadlily, oneleaf foamflower, sweetscented bedstraw, Pacific yew, American trail plant, dampwoods blueberry, common prince's pine and western rattlesnake plantain.
DISTRIBUTION AND EXTENT: North central Idaho; Lostpete soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Clearwater County, Idaho, 2003.
REMARKS: Diagnostic horizons and other features recognized in this pedon are:
Ochric epipedon - The zone from the mineral soil surface to 5 inches (A horizon)
Cambic horizon - The zone from 5 to 19 inches (Bw1 and Bw2 horizons)
Volcanic ash mantle - The zone from the mineral soil surface to 19 inches (A, Bw1 and Bw2 horizons)
Argillic horizon - The zone from 19 to 66 inches (2Bt1, 2Bt2, 2Bt3, 2Bt4 and 2Bt5 horizons)
Particle size control section - The zone from the mineral soil surface to 39 inches (A, Bw1, Bw2, 2Bt1, and part of the 2Bt2 horizon)
The ranges of values listed under the Range in Characteristics for the soil properties, Volcanic glass content, Acid-oxalate Al + 1/2 Fe, Phosphate retention and 15 bar water retention are estimates only.