LOCATION GOODINGTON IDEstablished Series
The Goodington series consists of deep, well drained soils that formed
in loess over residuum from basalt. Goodington soils are on basalt
plains and have slopes of 2 to 20 percent. Permeability is very slow.
The average annual precipitation is about 14 inches, and the average
annual temperature is about 41 degrees F.
TAXONOMIC CLASS: Fine, smectitic, frigid Typic Palexerolls
TYPICAL PEDON: Goodington silt loam on a 4 percent slope at an
elevation of 5,300 feet in rangeland. When described June 14, 1954 the
soil was moist throughout. (Colors are for dry soil unless otherwise
noted).
A1--0 to 6 inches; grayish brown (10YR 5/2) silt loam, very dark
grayish brown (10YR 3/2) moist; moderate thin platy structure; slightly
hard, friable, slightly sticky and slightly plastic; many fine roots;
many fine tubular pores; neutral (pH 6.8); clear smooth boundary. (5
to 8 inches thick)
A2--6 to 10 inches; grayish brown (10YR 5/2) silt loam, very dark
grayish brown (10YR 3/2) moist; weak medium subangular blocky
structure; slightly hard, friable, slightly sticky and slightly
plastic; many fine roots; many fine tubular pores; neutral (pH 6.6);
clear smooth boundary. (3 to 5 inches thick)
BA--10 to 12 inches; brown (7.5YR 4/2) silty clay loam, dark brown
(7.5YR 3/2) moist; moderate fine subangular blocky structure; hard,
firm, sticky and plastic; common fine roots; many fine tubular pores;
pale brown (10YR 6/3) silt coatings on faces of peds; slightly acid (pH
6.4) abrupt smooth boundary. (0 to 3 inches thick)
Bt1--12 to 18 inches; brown (7.5YR 5/4) silty clay, dark brown
(7.5YR 4/4) moist; strong medium prismatic structure; very hard, very
firm, very sticky and very plastic; few fine roots; many fine tubular
pores; many slickensides present on ped faces; slightly acid (pH 6.2);
clear smooth boundary. (5 to 8 inches thick)
Bt2--18 to 26 inches; brown (7.5YR 5/4) silty clay, dark brown
(7.5YR 4/4) moist; strong medium angular blocky structure; very hard;
very firm, very sticky and very plastic; few fine roots; common fine
tubular pores; continuous thick clay films on all ped faces; neutral
(pH 6.8); clear smooth boundary. (7 to 10 inches thick)
Bt3--26 to 34 inches; brown (7.5YR 5/4) silty clay loam, dark brown
(7.5YR 4/4) moist; moderate medium angular blocky structure; very hard,
very firm, very sticky and very plastic; few fine roots; common fine
tubular pores; continuous moderately thick clay films on all ped faces;
moderately alkaline (pH 8.2); clear smooth boundary. (7 to 10 inches
thick)
Bk--34 to 56 inches; pinkish gray (7.5YR 6/2) silty clay loam, dark
brown (7.5YR 4/2) moist; moderate medium angular blocky structure; very
hard, very firm, very sticky and very plastic; few fine tubular pores
nearly continuous pinkish white (7.5YR 8/2) lime coating on ped faces
and in pores; strongly effervescent; (20 percent calcium carbonate)
moderately alkaline (pH 8.4); clear smooth boundary. (18 to 26 inches
thick)
R--56 inches; hard lime-covered basalt bedrock.
TYPE LOCATION: Blaine County, Idaho about 6 miles east and 6 miles
north of Carey; 2,200 feet west and 2,000 feet north of the southeast
corner of sec. 15, T. 1 N., R. 22 E.
RANGE IN CHARACTERISTICS:
Depth to basalt bedrock - 40 to 60 inches
Average annual soil temperature - 42 to 47 degrees F.
Thickness of mollic epipedon - 10 to 15 inches
A horizons
Color value, dry - 4 or 5
Color value, moist - 2 or 3
Chroma, moist or dry - 2 or 3
Clay content - 15 to 25 percent
Reaction - Slightly acid to neutral
Bt horizon
Color hue - 7.5YR or 10YR
Color value, dry - 4 or 5
Color value, moist - 3 or 4
Chroma, moist or dry - 2 through 4
Texture - SIC, C
Clay content - 40 to 55 percent
Clay increase - 20 percent absolute upper 7.5 cm.
Reaction - Neutral to moderately alkaline
Bk horizon
Color hue - 7.5YR or 10YR
Color value, dry - 5 or 6
Color value, moist - 3 or 4
Chroma, moist or dry - 2 through 4
Texture - SIL, SICL
Clay content - 25 to 40 percent
Rock fragments - 0 to 10 percent
Reaction - Mildly alkaline to moderately alkaline
COMPETING SERIES: These are the Bridgecreek, Deer Creek, Harkers,
Lacrol, Mohocken, Norcan, and Rands series. Bridgecreek and Mohocken
have a paralithic contact at depths of 20 to 40 inches. Deer Creek and
Harkers have more than 15 percent coarse fragments in the argillic.
Lacrol series is greater than 60 inches deep to the base of the
argillic horizon. Norcan soils are redder than 7.5YR. Rands soils do
not have a calcic horizon.
GEOGRAPHIC SETTING: Goodington soils are on basalt plains. Slopes
range from 2 to 20 percent. Elevation ranges from 4,800 to 6,200
feet. The soil formed in loess over residuum from basalt. The average
annual precipitation is 12 to 16 inches, most of which falls as snow
and early spring rain. The average annual temperature is 40 to 45
degrees F. The frost-free season is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Manard, Muldoon, and
Peevywell soils. Manard soils have a duripan and bedrock at 20 to 40
inches. Muldoon soils have fine-loamy control sections. Peevywell
soils are moderately deep to a duripan. Manard soils occur on the same
landscape. Muldoon and Peevywell soils occur on fan terraces.
DRAINAGE AND PERMEABILITY: Well drained, slow to medium runoff; very
slow permeability.
USE AND VEGETATION: Mainly used for rangeland and some irrigated
pasture. Vegetation is Mountain big sagebrush, bluebunch wheatgrass,
Idaho fescue, Nevada bluegrass.
DISTRIBUTION AND EXTENT: South-central Idaho. This series is
inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Blaine County, Idaho, 1985.
REMARKS: Diagnostic horizons and features recognized in this series
are:
Mollic epipedon - occurs from the soil surface to approximately 12
inches (A1, A2, and BA horizons).
Argillic horizons - the zone from approximately 12 to 34 inches (Bt1,
Bt2, and Bt3 horizons).
Clay increase is 20 percent absolute in upper 7.5 cm.
Calcic horizon - the zone from approximately 34 to 56 inches.
National Cooperative Soil Survey