LOCATION ADIOS IDEstablished Series
The Adios series consists of moderately deep to a duripan, well drained
soils that formed in residuum and slope alluvium from rhyolite and
andesite. Adios soils are on sides of buttes and have slopes of 8 to
60 percent. Permeability is very slow. The average annual
precipitation is about 12 inches, and average annual air temperature is
about 47 degrees F.
TAXONOMIC CLASS: Fine, smectitic, mesic Argiduridic Durixerolls
TYPICAL PEDON: Adios stony loam on a 15 percent slope at an elevation
of 4,940 feet in rangeland. When described on May 18, 1983, the soil
was moist throughout. (Colors are for air dry soil unless otherwise
noted.)
A1--0 to 2 inches; brown (10YR 5/3) stony loam, dark brown (10YR
3/3) moist; weak fine granular structure; soft, very friable, slightly
sticky and plastic; many very fine and fine and few medium and coarse
roots; many very fine and fine tubular pores; about 5 percent pebbles,
about 3 percent stones; neutral (pH 7.0); clear smooth boundary. (1 to
4 inches thick)
A2--2 to 5 inches; brown (10YR 5/3) stony loam, dark brown (10YR
3/3) moist; moderate fine subangular blocky structure; soft friable,
slightly sticky and plastic; many very fine and fine and few medium and
coarse roots; many very fine and fine tubular pores; about 5 percent
pebbles, about 10 percent stones; neutral (pH 7.0); clear wavy
boundary. (2 to 6 inches thick)
Bt1--5 to 8 inches; yellowish brown (10YR 5/4) clay loam, dark
brown (10YR 3/3) moist; strong fine subangular blocky structure;
slightly hard, firm, sticky and plastic; common fine and medium roots;
common very fine and fine tubular pores; few thin clay films lining
pores and on faces of peds; about 5 percent pebbles, about 3 percent
stones; neutral (pH 7.2); abrupt wavy boundary. (0 to 8 inches thick)
Bt2--8 to 16 inches; yellowish brown (10YR 5/4) clay, dark
yellowish brown (10YR 4/4) moist; strong fine and medium prismatic
structure; very hard, very firm, very sticky and very plastic; common
fine and medium roots concentrated along vertical ped faces; common
fine tubular pores; many thick clay films lining pores and on faces of
peds; about 5 percent pebbles; mildly alkaline (pH 7.4); gradual wavy
boundary. (4 to 16 inches thick)
Bt3--16 to 20 inches; light yellowish brown (10YR 6/4) clay,
yellowish brown (10YR 5/4) moist; moderate fine and medium prismatic
structure parting to strong fine and medium angular blocky; very hard,
very firm, very sticky and very plastic; common fine and medium roots
concentrated along vertical ped faces; few fine tubular pores; many
moderately thick clay films lining pores and on faces of peds; about 5
percent pebbles; mildly alkaline (pH 7.6); clear wavy boundary. (4 to
9 inches thick)
Btk--20 to 23 inches; very pale brown (10YR 7/4) clay loam, light
yellowish brown (10YR 6/4) moist; strong fine and medium angular blocky
structure; very hard, firm, sticky and plastic; common fine roots; few
fine tubular pores; few moderately thick clay films on faces of peds;
strong effervescence (20 percent calcium carbonate); about 10 percent
pebbles, about 3 percent stones; mildly alkaline (pH 7.8); abrupt
smooth boundary. (1 to 6 inches thick)
Bqkm--23 to 27 inches; white (10YR 8/2) indurated duripan, pale
brown (10YR 6/3) moist; massive; root mats on top of silica cap;
continuous silica cap 1 to 2mm thick at 23 inches; violent
effervescence (30 percent calcium carbonate); about 10 percent pebbles,
about 5 percent cobbles, about 3 percent stones; moderately alkaline
(pH 8.2); abrupt wavy boundary. (2 to 6 inches thick)
R--27 inches; fractured rhyolite with silica and calcium carbonate
in the fractures.
TYPE LOCATION: Blaine County, Idaho about 3 miles southeast of the dam
on Magic Reservoir; 1,800 feet north and 2,600 feet west of the
southeast corner of section 22, T. 2 S., R. 18 E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 47 to 52 degrees F
Thickness of mollic epipedon - 7 to 11 inches
Depth to duripan - 22 to 31 inches
Depth to bedrock - 26 to 36 inches
A horizon
Chroma- 2 or 3 dry or moist
Bt horizon
Hue- 10YR or 7.5YR
Value- 4 through 6 dry and 3 through 5 moist
Chroma- 3 or 4 moist
Texture- C, SIC, CL, and GR-C
Rock fragment content - 0 to 15 percent pebbles and 0 to 10 percent
cobbles or stones
Clay content - 35 to 60 percent
Reaction - neutral to mildly alkaline
Btk horizon
Value- 5 or 6 moist
Texture- CL or GR-CL
Bqkm horizon
Hue- 10YR or 7.5YR
Value- 6 or 7 moist
Chroma- 1 or 2 dry and 2 or 3 moist
Calcium carbonate equivalent - 15 to 40 percent
Distance between indurated plates - 1 to 3 inches
COMPETING SERIES: These are the Barnard, Fleischmann, Seval, and
Xerta. Barnard, Fleischmann, and Seval soils lack bedrock above 40
inches. Fleischmann soils also lack an indurated duripan. Xerta soils
have more than 35 percent rock fragments in the Btk horizon and have an
abrupt boundary between the A and Bt horizons.
GEOGRAPHIC SETTING: Adios soils are on sides of buttes. Slopes range
from 8 to 60 percent. Elevation ranges from 4,600 to 5,200 feet. The
soil formed in residuum and slope alluvium from rhyolite and andesite.
The annual precipitation is 11 to 13 inches, most of which falls as
snow and early spring rain. The annual air temperature is about 45 to
50 degrees F. The frost-free season is 100 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bostrum, Gooding,
Rehfield, and Yutrue. Bostrum and Gooding soils lack a mollic
epipedon. Rehfield soils have less than 35 percent clay in the
argillic horizon. Yutrue soils lack a mollic epipedon and have cracks
from the surface to 20 inches at some time during the year. These
soils all occur on the same landscape.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff;
very slow permeability.
USE AND VEGETATION: Mainly used for rangeland. Vegetation is Wyoming
big sagebrush and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Adios soils are inextensive in south central
Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Blaine County, Idaho, 1985.
REMARKS: Diagnostic horizons and features recognized in this soil are:
Mollic epipedon - the zone from the surface of the soil to a depth of
approximately 8 inches (A1, A2, and Bt1 horizons)
Argillic horizon - the zone from approximately 5 to 23 inches (Bt1,
Bt2, Bt3, and Btk horizons)
Duripan- the zone from approximately 23 to 27 inches (Bqkm horizon)
National Cooperative Soil Survey