LOCATION DROEM IDTentative Series
TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Typic Argixerolls
TYPICAL PEDON: Droem clay loam - on a south-facing mountain slope of 8 percent on rangeland (Class I stoniness) at 6,600 feet elevation. (Colors are for dry soil unless otherwise stated. When described on September 29, 1980, the soil was slightly moist.)
A1--0 to 4 inches; very dark grayish brown (10YR 3/2) clay 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 roots; neutral (pH 7.0); clear, smooth boundary. (3 to 6 inches thick)
A2--4 to 15 inches; dark grayish brown (10YR 4/2) clay loam, very dark brown (10YR 2/2) moist; moderate fine subangular blocky structure; hard, very friable, slightly sticky and plastic; common very fine roots; common very fine tubular pores; mildly alkaline (pH 7.4); clear smooth boundary. (0 to 11 inches thick)
Bt--15 to 32 inches; yellowish brown (10YR 5/4) very cobbly clay loam, dark yellowish brown (10YR 3/4) moist; few fine distinct mottles of yellowish brown (10YR 4/6) moist; weak fine prismatic structure parting to moderate fine subangular blocky; very hard, friable, sticky and plastic; common very fine roots; few very fine irregular pores; many thin clay films on faces of peds (slickensides present); 30 percent cobbles, 5 percent pebbles, and 5 percent stones; moderately alkaline (pH 8.0); abrupt irregular boundary.
R--32 inches; andesite with agate inclusions.
TYPE LOCATION: Butte County, Idaho; about 1 3/4 miles northwest of Timbered Droem; 1,500 feet south, 300 feet west of the northeast corner, sec. 31, T. 4 N., R. 25 E.
RANGE IN CHARACTERISTICS:
Stoniness - Class I to Class III
Average annual soil temperature - 42 to 46 degrees F.
Depth to bedrock - 20 to 40 inches
A horizon
Color value, dry - 3 to 5
Chroma, moist or dry - 2 or 3
Reaction - neutral or mildly alkaline
AB horizon - in some pedons
Bt horizon
Color value, dry - 4 or 5
Value, moist - 3 or 4
Chroma, dry or moist - 3 or 4
Reaction - neutral through moderately alkaline
Clay - 35 to 40 percent
Sand - 25 to 65 percent
Rock fragments - 35 to 65 percent
Pebbles - 0 to 50 percent
Cobbles - 0 to 20 percent
Stones - 0 to 20 percent
Texture - very cobbly clay loam, very gravelly clay loam
COMPETING SERIES: These are the Leevan, Loneridge, Wenzel, and Yeates Hollow series. Leevan soils have 40 to 58 percent clay and are nonskeletal in the upper part. Loneridge and Wenzel soils have mixed mineralogy. Yeates Hollow soils lack bedrock within a depth of 40 inches.
GEOGRAPHIC SETTING: Droem soils are on mountainside slopes and have formed from basalt or other igneous rocks. Aspect is south or west. Elevations range from 6,000 to 7,000 feet. Slopes are 8 to 40 percent. Precipitation ranges from 12 to 16 inches. The frost-free period is from 45 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Acord, Gabica, Grouseville, Howcan, and Lost River soils. Acord, Grouseville, and Lost River soils are deeper than 40 inches. Gabica soils are less than 20 inches to bedrock. Howcan soils are moderately fine textured in the B2t horizon.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability; moderate or rapid runoff.
USE AND VEGETATION: Droem soils are used primarily for rangeland. Vegetation is dominated by mountain big sagebrush with an understory of bluebunch wheatgrass and Nevada bluegrass.
DISTRIBUTION AND EXTENT: Southeastern Idaho; Droem soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Butte County, Idaho, 1980.