LOCATION DOSLOMAS NMEstablished Series
TAXONOMIC CLASS: Clayey over sandy or sandy-skeletal, mixed, superactive, frigid Typic Argiustolls
TYPICAL PEDON: Doslomas loam - hayland. (Colors are for dry soils unless otherwise noted.)
A--0 to 7 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, friable, sticky and plastic; many very fine and fine roots; few very fine pores; neutral (pH 7.0); abrupt smooth boundary. (2 to 8 inches thick)
Bt1--7 to 12 inches; yellowish brown (10YR 5/4) clay loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, firm, very sticky and very plastic; common fine and few coarse roots; few very fine and fine pores; few thin clay films on faces of peds; 5 percent pebbles; neutral (pH 7.2); clear smooth boundary. (5 to 10 inches thick)
Bt2--12 to 28 inches; yellowish brown (10YR 5/4) clay, dark yellowish brown (10YR 3/4) moist; strong coarse subangular blocky structure; hard, firm, very sticky and very plastic; few fine and medium roots; few very fine and fine pores; common moderately thick clay films on faces of peds; 5 percent pebbles; mildly alkaline (pH 7.6); abrupt wavy boundary. (10 to 20 inches thick)
2C--28 to 60 inches; brown (10YR 5/3) extremely cobbly coarse sand, dark brown (10YR 3/3) moist; single grain; loose, nonsticky and nonplastic; few fine roots; 30 percent pebbles, 40 percent cobbles; mildly alkaline (pH 7.6).
TYPE LOCATION: Rio Arriba County, New Mexico; approximately 0.2 mile south of Chama, New Mexico. New Mexico state plane coordinates 2,132,900 feet north and 404,500 feet east; 106 degrees, 34 minutes, 54 seconds west longitude; 36 degrees, 51 minutes, 36 second north latitude.
RANGE IN CHARACTERISTICS:
Soil moisture - The soil is moist in some part of the soil moisture control section November through April and July through August.
Soil temperature - 41 to 47 degrees F.
Thickness of Mollic epipedon: 10 to 16 inches thick.
Control Section - Percent clay: 35 to 45 percent.
Depth to contrasting particle size - 26 to 30 inches
A horizon - Value: 3 or 4 dry, 2 or 3 moist.
Chroma: 2 or 3.
Rock fragments: 0 to 10 percent pebbles.
Bt horizon - Value: 4 or 5 dry, 3 or 4 moist.
Chroma: 3 or 4.
Rock fragments: 0 to 10 percent pebbles.
Texture: clay loam, clay.
2C horizon - Value: 4 or 5 dry, 3 or 4 moist.
Chroma: 3 or 4.
Rock fragments: 25 to 45 percent pebbles, 35 to 45 percent cobbles.
COMPETING SERIES: There are no competing series at this time. A similar soil is Colomex(NM). Colomex soils have less than 35 percent clay in the particle-size control section and the darkened surface layer lacks the thickness of a mollic epipedon.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar Colomex in addition to the Dula and Grava soils. Dula and Grava soils are on high flood plains and are saturated during spring and summer.
GEOGRAPHIC SETTING: Doslomas soils are on stream terraces. These soils formed in alluvium derived from metamorphic and igneous rocks. Slopes are 0 to 3 percent. Elevation is 7,000 to 8,000 feet. Mean annual precipitation is 18 to 22 inches. The mean annual temperature is 40 to 45 degrees F, and the frost-free period is 80 to 100 days.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately slow permeability.
USE AND VEGETATION: Doslomas soils are used for livestock grazing, hay crops, and wildlife habitat. The present vegetation is grasses and scattered ponderosa pine.
DISTRIBUTION AND EXTENT: North-central New Mexico. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Rio Arriba County, New Mexico, 1989.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic Epipedon - The zone from the surface to a depth of 12 inches (A horizon).
Argillic horizon - The zone from 7 to 28 inches (Bt horizons).
Lithological discontinuity - The zone from 28 to 60 inches (2C horizon).