LOCATION PINEHOLLOW IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Calcic Argixerolls
TYPICAL PEDON: Pinehollow very cobbly silt loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 2 inches; brown (7.5YR 5/3) very cobbly silt loam, dark brown (7.5YR 3/2) moist; moderate fine granular structure; soft, very friable, non-sticky and non-plastic; many very fine, fine and medium roots; many very fine and fine interstitial pores; 20 percent gravel and 15 percent cobbles; slightly acid (pH 6.3); clear wavy boundary. (2 to 5 inches thick)
A2--2 to 7 inches; reddish brown (5YR 5/3) very cobbly silt loam, dark reddish brown (5YR 3/2) moist; moderate fine granular structure; soft, very friable, non-sticky and non-plastic; many very fine, fine and medium roots; many very fine and fine interstitial poors;10 percent gravel and 30 percent cobbles; slightly acid (pH 6.5); clear wavy boundary. (0 to 6 inches thick)
Bt1--7 to 16 inches; reddish brown (2.5YR 5/4) cobbly loam, reddish brown (2.5YR 4/4) moist; strong fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and non-plastic; many very fine and fine roots; many fine interstitial and common very fine tubular pores; common discontinuous faint clay films on faces of peds; 10 percent gravel and 20 percent cobbles; neutral (pH 6.8); gradual wavy boundary. (3 to 9 inches thick)
Bt2--16 to 22 inches; reddish brown (2.5YR 5/4) gravelly loam, dark reddish brown (2.5YR 3/4) moist; strong coarse subangular blocky structure; moderately hard, firm, slightly sticky and non-plastic; common very fine and roots; common very fine and fine interstitial pores; common discontinuous faint clay films on faces of peds; 20 percent gravel and 10 percent cobbles; neutral (pH 6.9); clear wavy boundary. (0 to 7 inches thick)
Btk--22 to 26 inches; reddish brown (2.5YR 5/4) very gravelly loam, dark reddish brown (2.5YR 3/4) moist; strong coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few patchy faint clay films on faces of peds; 30 percent gravel and 10 percent cobbles; few fine masses of carbonates and disseminated lime; strongly effervescent; moderately alkaline (pH 7.9); gradual wavy boundary. (3 to 28 inches thick)
R--26 inches; fractured red sandstone.
TYPE LOCATION: Bear Lake County, Idaho; approximately 4.5 miles southwest of Pegram; about 1,100 feet south and 1,500 feet east of the northwest corner of section 21, T. 15 S., R. 45 E.; USGS Pegram Creek 7.5 minute topographic quadrangle; latitude - 42 degrees, 06 minutes, 28 seconds north; longitude - 111 degrees, 12 minutes, 12.4 seconds west, NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture control section - usually moist, dry in all parts for 45 consecutive days or more in the four months following the summer solstice. Xeric moisture regime.
Thickness of mollic epipedon - 7 to 10 inches (may extend into the Bt1 horizon)
Depth to secondary carbonate accumulation -- 7 to 22 inches
Depth to bedrock - 20 to 40 inches
Average annual soil temperature - 40 to 43 degrees F. Frigid soil temperature regime.
Particle-size control section
Clay content - 23 to 34 percent
Rock fragment content - average 10 to 35 percent gravel and/or cobbles that increase with depth.
A1 horizon
Hue - 10YR to 5YR
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - cobbly silt loam, very cobbly silt loam
Clay content - 18 to 23 percent
Rock fragment content - 25 to 50 percent (10 to 20 percent gravel, 15 to 30 percent cobbles)
Reaction - moderately acid to neutral - pH 5.8 to 7.3
A2 horizon (when present)
Hue - 10YR to 5YR
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture of fine earth (<2mm) fraction- loam or silt loam
Clay content - 18 to 25 percent
Rock fragments - 10 to 50 percent (10 to 20 percent gravel, 0 to 30 percent cobbles)
Reaction - moderately acid to neutral - pH 5.8 to 7.3
Bt horizons
Hue - 7.5YR to 2.5YR
Value - 4 or 5 dry, 3 or 4 moist
Chroma - 3 to 6 dry or moist
Texture of the fine earth (<2mm) fraction - loam, silt loam, clay loam or silty clay loam
Clay content - 25 to 34 percent
Rock fragment content - 5 to 35 percent (5 to 20 percent gravel, 0 to 20 percent cobbles)
Reaction - slighty acid to slightly alkaline - pH 6.1 to 7.8
Btk horizon
Hue - 7.5YR to 2.5YR
Value - 4 or 5 dry, 3 to 5 moist
Chroma - 3 or 4 dry or moist
Texture of the fine earth (<2mm) fraction - loam, silt loam, clay loam or silty clay loam
Clay content - 23 to 30 percent
Rock fragment content - 10 to 50 percent (10 to 30 percent gravel, 0 to 20 percent cobbles)
Calcium carbonate equivalent - 3 to 15 percent
Reaction - slightly or moderately alkaline - pH 7.4 to 8.4
Some pedons may have thin Bk, BC or C horizons with 10 to 50 percent gravel and/or cobbles and textures similar to the Btk.
COMPETING SERIES: These are the:
Bess (UT) - are very deep.
Border (ID+WY) - are very deep.
Cedarpoint (UT) - are very deep.
Chesnimnus (OR) - are very deep.
Fewkes (UT) are very deep.
Justesen (ID+UT) - are very deep.
McCarey (ID) - do not have Btk horizons, formed in loess or silty alluvium and material weathered from basalt.
Pegram (ID) - are very deep.
Redpine (ID) - are moderately deep to a Cr horizon.
Vicking (UT+ID) - are very deep.
Vickton (ID) - are very deep.
GEOGRAPHIC SETTING:
Landform: mountain backslopes, shoulders and summits
Elevation: 6,300 to 7,250 feet
Slope: 2 to 45 percent
Parent material: red sandstone or red siltstone
Climate: long, cold winters; moist springs; warm, dry, summers.
Average annual precipitation: 12 to 18 inches
Average annual temperature: 39 to 43 degrees F.
Frost-free season: 70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cupine, Dry Canyon, Jebo and Sheep Creek series. Cupine soils occur on shoulders and backslopes, are moderately deep to sandstone, do not have a calcic horizon and have a loamy-skeletal particle size control section. Dry Canyon soils occur on similar or slightly lower landscape positions, have a mollic epipedon and are deep to bedrock. Jebo soils occur on similar landscape positions, are moderately deep to bedrock, do not have Bt or Btk horizons and have less than 18 percent clay in the particle size control section. Sheep Creek soils occur on similar landscape positions and have a loamy-skeletal particle size control section.
DRAINAGE AND PERMEABILITY: Well drained; medium to very high surface runoff; moderately slow permeability.
USE AND VEGETATION: Pinehollow soils are used for rangeland and wildlife habitat. The present vegetation is mainly mountain big sagebrush, basin big sagebrush, bluebunch wheatgrass, prairie junegrass, bluegrass, antelope bitterbrush, serviceberry and snowberry.
DISTRIBUTION AND EXTENT: Southeastern Idaho. These soils are of small extent in MLRA 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008. The name is from the nearby Pine Hollow.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 7 inches (the A1 and A2 horizons).
Argillic horizon and particle size control section - The zone from 7 to 26 inches (the Bt1, Bt2 and Btk horizons).
Zone of secondary carbonate accumulation - The zone from 22 to 26 inches (Btk horizon)
In some pedons it is necessary to mix the top seven inches to meet mollic requirements.