LOCATION SIDESLIDE CO
Established Series
Rev. JWH-DKR-WWJ-KLS
02/2018
SIDESLIDE SERIES
The Sideslide series consists of very deep, somewhat poorly drained soils that formed in alluvium and slope alluvium derived from Mancos shale. Sideslide soils are in drainageways, and on hillslopes and alluvial fans. Slopes range from 1 to 9 percent. Mean annual precipitation is about 356 mm and the mean annual temperature is about 9.4 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, calcareous, mesic Typic Endoaquepts
TYPICAL PEDON: Sideslide silty clay loam, on a southwest facing, 5 percent slope, in pasture at an elevation of 2,012 meters. (Colors are for dry soil unless otherwise noted. When described on September 16 1996, the soil profile was moist and was saturated below 38 cm from the surface.)
Ap--0 to 8 cm; pale brown (10YR 6/3) silty clay loam, very dark grayish brown (10YR 3/2) moist; weak medium granular structure; moderately hard, very firm, slightly sticky and moderately plastic; many very fine and common fine and medium roots throughout; violently effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (5 to 15 cm thick)
Bw--8 to 64 cm; light brownish gray (10YR 6/2) silty clay loam, dark grayish brown (10YR 4/2) moist; common fine faint yellowish brown (10YR 5/4) iron accumulations; moderate very fine subangular blocky structure; very hard, firm, slightly sticky and moderately plastic; common very fine and fine, and few medium roots throughout; common very fine, fine, and medium discontinuous tubular pores; violently effervescent; moderately alkaline (pH 8.2); gradual smooth boundary. (13 to 102 cm thick)
C1--64 to 102 cm; light brownish gray (10YR 6/2) silty clay loam, dark grayish brown (10YR 4/2) moist; common fine faint yellowish brown (10YR 5/4) iron accumulations and common prominent gray (2.5Y 6/1) iron depletions; massive; very hard, firm, slightly sticky and moderately plastic; many continuous faint pressure faces throughout; common very fine and few moderate roots throughout; common very fine and fine discontinuous tubular pores; few fine carbonate threads; strongly effervescent; moderately alkaline (pH 8.2); gradual smooth boundary. (13 to 102 cm thick)
C2--102 to 152 cm; light brownish gray (10YR 6/2) clay, dark grayish brown (2.5Y 4/2) moist; common fine faint yellowish brown (10YR 5/4) iron masses and common prominent gray (2.5Y 6/1) iron depletions; massive; very hard, firm, slightly sticky and very plastic; few very fine roots throughout; few fine carbonate threads; strongly effervescent; moderately alkaline (pH 8.2). (0 to 76 cm thick)
TYPE LOCATION: Montezuma County, Colorado; about 2.5 miles south of Mancos; located about 701 meters east and 152 meters south of the northwest corner of Sec. 8, T. 35 N., R. 13 W.; Mancos USGS quad; Lat. 37 degrees, 18 minutes, 40 seconds, N. and Long. 108 degrees, 18 minutes, 29 seconds, W., NAD 27.
RANGE IN CHARACTERISTICS:
Depth to redox concentrations and depletions: 8 to 51 cm
Depth to water table: 15 to 61 cm from April to September
Surface rock fragments: 0 to 10 percent sandstone gravel and cobbles
Particle-size control section: 27 to 35 percent clay
A horizon
Hue: 10YR
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 2 or 3, dry or moist
Texture: silty clay loam
Rock fragments: 0 to 10 percent as gravel or cobbles
Calcium carbonate equivalent: 0 to 1 percent
Electrical conductivity (mmhos/cm): 0 to 4
Reaction (pH): 7.4 to 8.4
Bw horizon
Hue: 10YR
Value: 5 or 6 dry, 3 to 5 moist
Chroma: 1 or 2, dry or moist
Texture: silty clay loam or clay loam
Clay content: 18 to 35 percent
Rock fragments: 0 to 3 percent as gravel or cobbles
Calcium carbonate equivalent: 1 to 5 percent
Electrical conductivity (mmhos/cm): 4 to 8
Reaction (pH): 7.9 to 8.4
C horizon
Hue: 10YR or 2.5Y
Value: 5 or 6 dry, 3 to 5 moist
Chroma: 1 to 3, dry or moist
Texture: silty clay loam, clay loam, or clay
Rock fragments: 0 to 3 percent as gravel or cobbles
Calcium carbonate equivalent: 1 to 5 percent
Electrical conductivity (mmhos/cm): 4 to 8
Reaction (pH): 7.9 to 8.4
COMPETING SERIES:
Hogum (NV) - have a calcium carbonate equivalent greater than 5 percent and do not have redoximorphic features in the solum
GEOGRAPHIC SETTING:
Landform - alluvial fans, drainageways, and hillslopes
Elevation - 1,830 to 2,256 meters
Slopes - 1 to 9 percent
Parent material - alluvium and slope alluvium derived from Mancos shale
Mean annual soil temperature - 7.8 to 10.0 degrees C.
Mean annual precipitation - 330 to 410 mm
Precipitation pattern - Precipitation is fairly evenly distributed throughout the year with July and August being slightly wetter and June being slightly dryer
Frost-free period - 100 to 130 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: somewhat poorly drained, high or very high runoff, slow permeability
USE AND VEGETATION: These soils are used mainly as pasture. Dominant vegetation is alkali sacaton, inland saltgrass, redtop, baltic rush, and clover.
DISTRIBUTION AND EXTENT: Southwest Colorado. LRR D, MLRA 36; small extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Cortez Area, Colorado, Parts of Dolores and Montezuma Counties 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Cambic horizon: 8 to 64 cm to aquic conditions, soil structure and chroma of 2 with redox concentrations (Bw)
Redoximorphic features: 8 to 152 cm (Bw, C1, and C2)
Water table: 15 to 61 cm to aquic conditions at some time during the year.
Note: Dark soil colors are lithochromic in origin.
Particle size control section: 25 to 100 cm (Bw, C1)
Sideslide soils have a mesic temperature regime and are in an aquic soil moisture regime with a typic subclass.
National Cooperative Soil Survey
U.S.A.