LOCATION PETTINGELL COEstablished Series
TAXONOMIC CLASS: loamy-skeletal, micaceous Ustic Haplocryolls
TYPICAL PEDON: Pettingell gravelly sandy loam, on a northwestern facing, convex 38 percent slope under Rocky mountain Douglas fir, lodgepole pine and grasses at an elevation of 8755 feet. (Colors are for dry soils unless otherwise noted.)
The surface is covered by 1 percent stones, 3 percent cobble and 10 percent gravel.
A1--0 to 4 inches; dark grayish brown (10YR 4/2), gravelly sandy loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine, fine and few medium roots; common, visible mica as fine and medium sand sized particles; 20 percent gravel, 5 percent cobble; neutral; clear smooth boundary. ( 1 to 4 inches thick)
A2--4 to 11 inches; brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; weak fine subangular blocky parting to moderate medium granular structure; soft, very friable; slightly sticky and slightly plastic; common very fine, fine and few medium and coarse roots; common, visible mica as fine and medium sand sized particles; 25 percent gravel, 10 percent cobble and 5 percent stone; slightly acid; clear wavy boundary. (9 to 12 inches thick)
Bw--11 to 18 inches; brown (10YR 5/3) very gravelly sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; soft, friable, nonsticky and nonplastic; few coarse, common very fine roots and few fine roots; common, visible mica as fine and medium sand sized particles; 35 percent gravel, 15 percent cobble and 1 percent stone; slightly acid; gradual wavy boundary. (6 to 12 inches thick)
BC--18 to 37 inches; very pale brown (10YR 7/3) very cobbly coarse sandy loam, pale brown (10YR 6/3) moist; massive; soft, very friable, nonsticky, and nonplastic; few very fine and fine roots; common, visible mica as fine and medium sand sized particles; 30 percent gravel, 15 percent cobble and 10 percent stone; slightly acid, gradual wavy boundary. (15 to 20 inches thick)
C--37 to 60 inches; pink (7.5YR 7/4) extremely stony sandy loam, reddish yellow (7.5YR 6/6) moist; massive; soft, very friable, slightly sticky, slightly plastic; few fine roots; many, visible mica as fine and medium sand sized particles; 30 percent gravel, 15 percent cobble and 20 percent stone; slightly acid. (15 to 30 inches thick)
TYPE LOCATION: Clear Creek County, Colorado; about 750 feet west and 800 feet north of the southeast corner sec. 3, T.4S., R.73W.. Idaho Springs Quadrangle; Latitude 39 degrees 43 minutes 37.25 seconds N. and Longitude 105 degrees 32 minutes 16.66 seconds W., NAD 1927
RANGE IN CHARACTERISTICS:
Soil moisture regime: Ustic/udic
Mean annual soil temperature: 39 to 42 degrees F.
Depth to cambic horizon: 10 to 20 inches
Depth to base of cambic horizon: 16 to 27 inches
Particle-size control section (weighted average):
Clay content: 8 to 18 percent
Sand content: 52 to 75 percent
Rock fragments: 35 to 75 percent
A horizon(s):
Hue: 10YR
Value: 3 through 5 dry, 2 through 3 moist
Chroma: 1 to 3
Texture: sandy loam, loam, coarse sandy loam, sandy loam
Clay Content: 10 to 26 percent
Rock fragments: 25 to 45 percent
Reaction: slightly acid to neutal
B horizon(s):
Hue: 10YR
Value: 5 or 7 dry, 4 to 5 moist
Chroma: 1 through 4
Texture: sandy loam, coarse sandy loam,
Clay Content: 8 to 25 percent
Rock fragments: 35 to 80 percent
Reaction: moderately acid to slightly acid
C horizon:
Hue: 10YR or 7.5YR
Value: 5 through 7 dry, 4 to 6 moist
Chroma: 3 through 6
Texture: coarse sandy loam, sandy loam,
Clay Content: 8 to 15 percent
Rock fragments: 35 to 80 percent
Reaction: moderately acid to slightly acid
COMPETING SERIES: There are no competing series in this family.
GEOGRAPHIC SETTING:
Parent Material: Colluvium and slope alluvium from schist, granite and gneiss
Landform: Mountain slopes and footslopes
Slopes: 5 to 80 percent
Elevation: 8000 to 10500 feet
Mean annual air temperature: 39 to 44 degrees F.
Mean annual precipitation: 18 to 22 inches
Precipitation pattern: Wettest months; March, April, May, June
Driest months; September and October
Frost-free period: 30 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gateview, Kittredge, Legault, Raleigh, and Rogert series. The Gateview soils have mollic colors extending below 16 inches and are on mountain slopes. The Kittredge soils argillic subsoils and are on mountain slopes and footslopes. The Legault, Raleigh and Rogert soils all shallow to bedrock and are on mountain slopes and ridges.
DRAINAGE AND PERMEABILITY: Well drained, medium to rapid runoff and rapid permeability.
USE AND VEGETATION: Recreation, wildlife and watershed. The present vegetation is Rocky mountain Douglas fir, lodgepole pine, ninebark, currant and an understory of mountain muhly, Arizona fescue and sheep fescue.
DISTRIBUTION AND EXTENT: Mountains of central Rocky Mountains, Colorado; LRR E, MLRA 48A
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Clear Creek County, Georgetown soil survey area, 2000. The name is taken from the mountain peak in Clear Creek County.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 10 to 40 inches.
Particle-size control section: The zone from 10 to 40 inches.
Mollic epipedon: The zone from 10 to 16 inches.
Taxonomic Version: 8th Edition, 1998
The mineralogy class was changed from paramicaceous to micaceous in 07/2010 by the National Soil Survey Center on request of the responsible MLRA regional office. The change was necessary based on the eleventh edition of the Keys to Soil Taxonomy, 2010.