LOCATION TRUMP COTentative Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Lithic Haplocryolls
TYPICAL PEDON: Trump loam - grassland. (Colors are for dry soil unless otherwise noted.)
Al--O to 5 inches; grayish brown (1OYR 5/2) loam, very dark grayish brown (1OYR 3/2) moist; moderate fine granular structure; soft, very friable, sticky, slightly plastic; 10 percent limestone gravel and fiat rock fragments; noncalcareous; neutral (pH 7.2); clear smooth boundary. (4 to 8 inches thick)
B2--5 to 12 inches; brown (7.5YR 5/2) loam, dark brown (7.5YR 3/2) moist; moderate medium and fine subangular blocky structure that part to fine granules; slightly hard, very friable, slightly sticky, slightly plastic; primary peds are hard; few thin glossy patches on faces of peds; 10 percent limestone gravel and flat rock fragments; noncalcareous; neutral pH (7.2); gradual wavy boundary. (4 to 14 inches thick)
Cca--12 to 16 inches; grayish brown (1OYR 5/2) loam, dark grayish brown (1OYR 4/2) moist; massive; hard, friable, slightly sticky, slightly plastic; 10 percent limestone gravel and flat rock fragments; calcareous; moderately alkaline (pH 8.2); abrupt wavy boundary. (2 to 6 inches thick)
TYPE LOCATION: Chaffee County, Colorado; SW1/4 Sec. 33, T. 13 S., R. 77 W.
RANGE IN CHARACTERISTICS: Depth to uniformly calcareous material ranges from 5 to 18 inches and is deeper than 1/2 the thickness of the mollic epipedon. Exchangeable sodium ranges from O to 15 percent in most subhorizons of the control section and there is no subhorizon as much as 3 inches above the bedrock that has as much as 15 percent. Depth to continuous subhorizons of genetically concentrated visible secondary calcium carbonate and/or sulfate in a fine earth matrix ranges from 8 to 18 inches. In some pedons visible secondary carbonate accumulation occurs as a plastered layer 1/4 to 1 inch thick on the surface of the bedrock. Depth to the lithic contact ranges from 10 to 20 inches. The control section is usually loam or clay loam and averages 18 to 35 percent clay, 5 to 60 percent silt, and 15 to 70 percent sand. Rock fragments range from O to 35 percent in most subhorizons of the control section and are mainly l/2 to 10 inches in diameter, but flagstones larger than 10 inches are common. A majority of subhorizons above the bedrock have hue of 7.5YR or yellower although thin subhorizons of redder hue occur in some pedons. Parent material is strongly effected by limestone, so that in a majority of subhorizons above the bedrock the calcium carbonate equivalent of the whole soil including coarse fragments less than 5 inches in diameter ranges from 8 to 39 percent and remains constant or increases with increasing depth or in most subhorizons above the bedrock the soil contains at least 5 percent rock fragments less than 5 inches in diameter that effervesce readily in dilute acid even though the surrounding soil mass is noncalcareous. These soils are dry in some part of the moisture control section at some time in most years.
The A horizon has hue of 2.5Y through 7.5YR, value of 4 or 5 dry, or 3 moist, and chroma of 1 through 3. It is neutral or mildly alkaline dilution unbuffered organic dye).
The B2 horizon has hue of 2.5Y through 7.5YR, value of 5 through 7 dry, 3 through 6 moist, and chroma of i through 6. Subhorizons redder than 7.5YR occur in some pedons. It ranges from neutral to moderately alkaline ã1:5 dilution unbuffered organic dye).
The C horizon has hue of 2.5Y through 7.5YR. Subhorizons redder than 7.5YR occur in some pedons. This horizon is moderately or strongly alkaline (1:5 dilution unbuffered organic dye). Calcium carbonate equivalent of the fine earth ranges from 2 to 14 percent.
COMPETING SERIES: These are the Duncom, Hazton, Jenkinson, Mucet, and Splitro series. Hazton and Splitro soils are noncalcareous throughout and have less than 18 percent clay. Mucet soils are noncalcareous throughout including coarse fragments. Duncom and Jenkinson soils are calcareous throughout or for at least more than 1/2 the thickness of the mollic epipedon.
GEOGRAPHIC SETTING: The Trump soils are on gently to steeply sloping ridges, hills, benches, mesa tops, and mountainsides. Slopes typically range from about 2 to 40 percent or more. The soils formed in thin calcareous medium to moderately fine textured materials weathered from limestone. At the type location the mean annual precipitation is about 18 inches with peak periods of precipitation occurring in the spring and early summer months. Mean annual temperature is 36 degrees F. and mean summer temperature is 5C degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Nathrop and woosley soils. Nathrop soils have an argillic horizon, have bedrock at depths of 20 to 40 inches, and have more than 35 percent rock fragments. woosley soils have an argillic horizon and have bedrock at depths of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate to slow permeability.
USE AND VEGETATION: Used principally as grazing land or for limited timber production. Native vegetation is scattered lodgepole pine, aspen, bluegrass, mountain fescue, ring muhly.
DISTRIBUTION AND EXTENT: Central Colorado and mountainous areas of Wyoming. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Trout Creek Area, Chaffee County, Colorado, 1957.
REMARKS: OSED scanned and cleaned up by Colorado. Last revised by state 4/73.