LOCATION TEEDOWN CO+NM
Established Series
Rev. JPP/TWH/KLS
03/2018
TEEDOWN SERIES
The Teedown series consists of very deep, well drained soils that formed in slope alluvium or colluvium derived mostly from shale and quartz diorite. Teedown soils are on mountain slopes and mesas. Slopes range from 3 to 30 percent. Mean annual precipitation is about 762 mm and mean annual air temperature is about 3.3 degrees C.
TAXONOMIC CLASS: Fine, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Teedown loam, on a southwest facing, simple, 10 percent slope in rangeland at an elevation of 2,886 meters. (Colors are for dry soil unless otherwise noted.)
A1--0 to 30 cm; dark gray (10YR 4/1) loam, very dark gray (10YR 3/1) moist; moderate medium granular structure; soft, friable, slightly sticky and slightly plastic; 5 percent cobbles, 2 percent stones; neutral (pH 6.6); gradual smooth boundary.
A2--30 to 51 cm; dark gray (10YR 4/1) loam, very dark gray (10YR 3/1) moist; weak medium subangular blocky structure parting to moderate medium granular; slightly hard, friable, slightly sticky and slightly plastic; 2 percent gravel, 8 percent cobbles, 3 percent stones; neutral (pH 6.8); clear smooth boundary. (combined thickness of A1, A2 - 35 to 80 cm)
Bt1--51 to 71 cm; grayish brown (10YR 5/2) clay, very dark grayish brown (10YR 3/2) moist; strong coarse prismatic structure parting to strong medium angular blocky; very hard, very firm, very sticky and very plastic; many prominent clay films on faces of peds; 2 percent gravel, 8 percent cobbles, 3 percent stones; slightly acid (pH 6.2); clear smooth boundary.
Bt2--71 to 97 cm; light yellowish brown (10YR 6/4) clay, yellowish brown (10YR 5/4) moist; strong coarse prismatic structure parting to moderate medium angular and subangular blocky; very hard, very firm, very sticky and very plastic; many prominent clay films on faces of peds; 2 percent gravel, 2 percent cobbles, 1 percent stones; slightly acid (pH 6.2); gradual smooth boundary. (combined thickness of Bt1, Bt2 - 30 to 110 cm thick)
C--97 to 152 cm; grayish brown (10YR 5/2) stony clay, dark grayish brown (10YR 4/2) moist; massive; very hard, very firm, very sticky and very plastic; 5 percent gravel, 10 percent cobbles, 15 percent stones; slightly acid (pH 6.4).
TYPE LOCATION: Montezuma County, Colorado; about 13 km northeast of Mancos along Forest Service Road 566; about 610 meters west and 366 meters south of the northeast corner of Sec. 33, T. 12 W., R. 37 N.; Rampart Hills USGS quad; Lat. 37 degrees, 25 minutes, 36 seconds, N. and Long. 108 degrees, 11 minutes, 09 seconds W., NAD 27.
RANGE IN CHARACTERISTICS:
Soil moisture: wettest months are July and August; driest months are May and June, however soils are still moist form snowmelt
Mean annual soil temperature: 3.3 to 5.6 degrees C.
Mean summer soil temperature: 10.0 to 13.3 degrees C.
Thickness of the mollic epipedon: 51 to 76 cm
Particle-size control section:
Clay content: 35 to 50 percent
Rock fragment content: 5 to 20 percent
A horizon
Hue: 7.5YR or 10YR
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 1 or 2, dry and moist
Rock fragment content: 0 to 15 percent
Reaction (pH): 6.1 to 7.3
Bt horizon
Hue: 7.5YR or 10YR
Value: 5 or 6 dry, 3 to 5 moist
Chroma: 2 to 6, dry and moist
Texture, fine earth fraction: clay loam or clay
Clay content: 35 to 45 percent in the upper part, 35 to 50 percent in the lower part; the clay increase at the upper boundary is less than 20 percent
Rock fragment content: 5 to 20 percent
Reaction (pH): 5.6 to 7.3
C horizon
Hue: 7.5YR or 10YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 2 to 6, dry and moist
Texture, fine earth fraction: clay loam or clay
Rock fragment content: 0 to 35 percent
Reaction (pH): 5.6 to 7.3
COMPETING SERIES:
Cratermo (ID) - are moderately deep to lithic contact
Hammersley (OR) - are deep to lithic contact
Lingshire (MT) - are moderately deep to paralithic contact
Tophat (ID) - driest months are July and August
GEOGRAPHIC SETTING:
Landform - mountain slopes and mesas
Elevation - 2,590 to 3,355 meters
Slopes - 3 to 30 percent
Parent material - slope alluvium or colluvium derived from shale and quartz diorite
Mean annual air temperature - 1.7 to 4.4 degrees C.
Mean annual precipitation - 635 to 1,016 meters
Precipitation pattern - wettest months are July and August, receiving slightly more precipitation than other months; driest months are May and June, receiving the least precipitation, however the soils are still moist from snowmelt
Frost-free period - 60 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; low or medium runoff; slow permeability.
USE AND VEGETATION: These soils are used principally for livestock grazing, woodland, and wildlife habitat. Native vegetation consists mainly of Thurber fescue, Columbia needlegrass, mountain brome, sedge, snowberry, wild celery, and quaking aspen.
DISTRIBUTION AND EXTENT: Southwestern Colorado and northern New Mexico; LRR D, E; MLRA 36, 48A; moderate extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Montezuma County, Colorado, Animas-Dolores Soil Survey Area. 2002. Series proposed in 1986. The name is taken from stock corrals in the vicinity.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 51 cm (A1 and A2 horizons)
Argillic horizon: 51 to 97 cm (Bt1 and Bt2 horizons)
Particle-size control section: 51 to 97 cm (Bt1 and Bt2 horizons)
Teedown soils have a cryic temperature regime and are in a udic soil moisture regime with a typic subclass.
The 6/2006 revision changes the mineralogy from smectitic to mixed.
National Cooperative Soil Survey
U.S.A.