LOCATION EAGLENEST WY
Tentative Series
IRD. DEW-JCK
03/2015
EAGLENEST SERIES
The Eaglenest series consists of very deep, well drained soils that formed in alluvium and colluvium. These soils are on alluvial fans, fan remnants and stream terraces. Slopes range from 0 to 15 percent. Mean annual precipitation is about 309 mm, and mean annual air temperature is about 7 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Ustic Calciargids
TYPICAL PEDON: Eaglenest fine sandy loam, 2 percent slope in rangeland at an elevation of 1,623 meters (colors are for dry soil unless otherwise noted).
A--0 to 8 cm; brown (10YR 4/3) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots throughout; common very fine vesicular pores; neutral (pH 6.7); clear smooth boundary. (3 to 16 cm thick)
Bt--8 to 30 cm; brown (10YR 5/3) clay loam, brown (10YR 4/3) moist; moderate medium prismatic structure parting to moderate medium angular blocky; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots throughout; common very fine tubular pores; common distinct clay films on all faces of peds; neutral (pH 7.2); clear smooth boundary. (17 to 28 cm thick)
Btk--30 to 68 cm; yellowish brown (10YR 5/4) very fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak medium prismatic structure parting to weak medium subangular blocky; hard, friable, slightly sticky and slightly plastic; common very fine, fine and medium roots throughout; common very fine tubular pores; common faint clay films on all faces of peds and common distinct calcium carbonate coats on the bottom of rock fragments; common fine threadlike calcium carbonate masses in the matrix; 5 percent gravel; strongly effervescent; moderately alkaline (pH 8.0); gradual wavy boundary. (23 to 59 cm thick)
Bk--68 to 135 cm; pale brown (10YR 6/3) gravelly sandy loam, brown (10YR 5/3) moist; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common fine roots throughout; common very fine tubular pores; many distinct calcium carbonate coats on the bottom of rock fragments; common medium threadlike calcium carbonate masses in the matrix; 23 percent gravel; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary. (28 to 67 cm thick)
BCk--135 to 168 cm; light yellowish brown (10YR 6/4) extremely gravelly loamy sand, yellowish brown (10YR 5/4) moist; single grain; loose, nonsticky and nonplastic; common very fine interstitial pores; many pendular calcium carbonate nodules on the bottom of rock fragments; 66 percent gravel; violently effervescent; strongly alkaline (pH 8.5).
TYPE LOCATION: Park County, Wyoming; 671 meters north and 152 meters west of the southeast corner of section 19, T.55 N., R.101 W. Eaglenest Basin USGS quadrangle; latitude 44 degrees 43 minutes 48.0 seconds N. and longitude 109 degrees 3 minutes 37.0 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 7 to 9 degrees C
Depth to secondary carbonates - 20 to 44 cm
Particle-size control section (weighted average) - 18 to 32 percent clay
A horizon
Hue: 7.5YR to 2.5Y
Value: 4, 5 or 6 dry, 3 or 4 moist
Chroma: 2 or 3
Texture: fine sandy loam, sandy loam or loam
Clay content: 10 to 22 percent
Rock fragments: 0 to 15 percent
Reaction: 6.6 to 7.5
Bt horizon
Hue: 7.5YR to 2.5Y
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 2 or 3
Texture: clay loam, loam or sandy clay loam
Clay content: 20 to 32 percent
Rock fragments: 0 to 15 percent
Reaction: 6.8 to 7.6
Btk horizon
Hue: 7.5YR to 2.5Y
Value: 5, 6 or 7 dry, 4, 5 or 6 moist
Chroma: 2, 3 or 4
Texture: loam, very fine sandy loam or fine sandy loam
Clay content: 18 to 30 percent
Rock fragments: 0 to 15 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: 7.8 to 8.2
Bk horizon
Hue: 7.5YR to 2.5Y
Value: 6, 7 or 8 dry, 5 or 6 moist
Chroma: 2, 3 or 4
Texture: sandy loam, loam or loamy sand
Clay content: 10 to 20 percent
Rock fragments: 20 to 65 percent
Calcium carbonate equivalent: 5 to 25 percent
Sodium absorption ratio: 0 to 5
Reaction: 8.0 to 8.6
BCk horizon
Hue: 7.5YR to 2.5Y
Value: 6, 7 or 8 dry, 5 or 6 moist
Chroma: 2, 3 or 4
Texture: sandy loam, loamy sand or sand
Clay content: 6 to 19 percent
Rock fragments: 35 to 65 percent
Calcium carbonate equivalent: 5 to 25 percent
Sodium absorption ratio: 0 to 3
Reaction: 7.8 to 8.4
COMPETING SERIES:
Alvey (UT) - have secondary carbonates above 20 cm; have less than 35 percent rock fragments in the subsoil
Barx (UT) - have hue redder than 7.5YR; have secondary carbonates above 20 cm
Cabreros (NM) - have a paralithic contact at depths of 50 to 100 cm
Cerrillos (NM) - have less than 35 percent rock fragments in the subsoil; have hue redder than 7.5YR
Clovis (NM) - have hue redder than 7.5YR; have a mean annual soil temperature higher than 9 degrees C
Fernando (NM) - have secondary carbonates above 20 cm; have less than 20 percent rock fragments in the subsoil
Flaco (NM) - have a lithic contact at depths of 50 to 100 cm
Fort (CO) -have less than 20 percent rock fragments in the subsoil; have a mean annual soil temperature higher than 9 degrees C
Horchata (NM) - have a lithic contact at depths of 50 to 100 cm
Maysdorf (WY) - have less than 20 percent rock fragments in the subsoil; have hue redder than 7.5YR
Millett (AZ) - have hue redder than 7.5YR; have a mean annual soil temperature higher than 9 degrees C
Palabria (NM) - have a lithic contact at depths of 100 to 150 cm
Progresso (CO) - have a lithic contact at depths of 50 to 100 cm
Sanostee (NM) - have a lithic contact at depths of 50 to 100 cm
Scholle (NM) - have less than 35 percent rock fragments in the lower part of the subsoil; have hue redder than 7.5YR
Selpats (WY) - have a lithological discontinuity; do not have textures coarser than sandy loam in the lower part of the subsoil
Solirec (UT) - have less than 20 percent rock fragments in the subsoil; do not have textures coarser than sandy loam in the lower part of the subsoil
Spenlo (UT) - have a lithic contact at depth of 150 to 200 cm; have hue redder than 7.5YR
Threetop (WY) - have a lithic contact at depths of 50 to 100 cm
Tuweep (AZ) - have a lithologic discontinuity; have less than 52 percent sand throughout
Wineg (AZ) - have a mean annual soil temperature higher than 9 degrees C
GEOGRAPHIC SETTING:
Landform - alluvial fans, fan remnants and stream terraces
Elevation - 1,400 to 1,700 meters
Slope - 0 to 15 percent
Parent material - alluvium or colluvium
Mean annual precipitation - 250 to 360 mm
Mean annual air temperature - 6 to 8 degrees C
Frost-free period - 110 to 150 days
GEOGRAPHICALLY ASSOCIATED SOILS: None Listed.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow to rapid permeability.
USE AND VEGETATION: Eaglenest soils are primarily used for livestock grazing and wildlife habitat but are also used for growing alfalfa and grass hay mixtures. Native vegetation is Wyoming big sagebrush, bluebunch wheatgrass, western wheatgrass, and needleandthread. Sites are susceptible to drought or misuse, deteriorating into a threadleaf sedge dominated community.
DISTRIBUTION AND EXTENT: Eaglenest soils are of small extent in northwestern Wyoming. MLRA 32.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Park County, Wyoming, 2015. The name is taken, in part, from the USGS quadrangle in which it's located.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric Epipedon - from 0 to 8 cm (A horizon)
Argillic Horizon - from 8 to 68 cm (Bt and Btk horizons)
Calcic horizon - from 68 to 168 cm (Bk and BCk horizons)
Particle-size control section - from 8 to 58 cm (Bt and part of the Btk horizon)
Eaglenest soils have a mesic temperature regime and an aridic moisture regime bordering on ustic.
National Cooperative Soil Survey
U.S.A.