LOCATION MANBURN CO+WYEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, frigid, shallow Ustic Haplargids
TYPICAL PEDON: Manburn coarse sandy loam - grassland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 4 inches; grayish brown (10YR 5/2) gravelly coarse sandy loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; soft, very friable, nonsticky, nonplastic; 20 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (3 to 8 inches thick).
B1--4 to 7 inches; brown (10YR 5/3) gravelly coarse sandy loam, dark brown (10YR 4/3) moist; weak medium subangular blocky structure that parts to medium granules; slightly hard, very friable, nonsticky, nonplastic; few thin glossy patches on some faces of peds and on the surfaces of pebbles; 20 percent gravel with some cobbles; slightly acid (pH 6.4); clear smooth boundary. (0 to 5 inches thick)
B2t--7 to 14 inches; yellowish brown (10YR 5/4) gravelly coarse sandy loam, dark yellowish brown (10YR 4/4) moist; moderate coarse subangular blocky structure that parts to fine subangular blocks; slightly hard, very friable, slightly sticky, slightly plastic; peds are very hard, friable; wax-like patches on faces of peds and wax-like coatings and fillings in root channels and pores; wax-like bridges between sand grains; 25 percent gravel and some cobbles; neutral (pH 6.6); gradual wavy boundary. (4 to 17 inches thick)
C--14 to 40 inches; soft sandstone and interbedded loamstone; reddish brown mottling and seams that are not representative or present drainage conditions.
TYPE LOCATION: Jackson County, Colorado; approximately 800 feet south and 250 feet east of center of Sec. 25, T. 11 N., R. 81 W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature is about 40 degrees F. and mean summer soil temperature is about 51 degrees F. Depth to the paralithic contact ranges from 10 to 20 inches. Depth to the base of the argillic horizon ranges from 10 to 20 inches. Mottling within the control section is usually very weak or absent but in some pedons there are mottles inherited from the parent beds and are not indicative of present drainage. Rock fragments range from 0 to 35 percent by volume in a major part of the solum and C horizon above the bedrock and are mainly 1/2 to 10 inches in diameter.
The A horizon has hue of 5Y through 7.5YR, value of 5 through 7 dry, 3 through 6 moist, and chroma of 1 through 4. It ranges from medium acid to mildly alkaline.
The B2t horizon has hue of 5Y through 7.5YR, value of 5 through 7 dry, 4 through 6 moist, and chroma of 1 through 6. It is typically gravelly loam, clay loam, or sandy clay loam but averages 18 to 35 percent clay, 5 to 60 percent silt, and 15 to 70 percent sand. This horizon ranges from slightly acid to mildly alkaline.
COMPETING SERIES: These are the Cushool, Diamondville, Rawah, and Satanka series. All of these soils have fine-loamy control sections and lack a paralithic contact above a depth of 20 inches.
GEOGRAPHIC SETTING: Manburn soils are on moderately to steeply sloping hills, ridges, valley side slopes, and mountainsides. Slopes typically range from about 2 to 60 percent. The soil formed in thin noncalcareous medium to moderately fine textured materials weathered from sedimentary bedrock. At the type location the mean annual precipitation is about 15 inches with peak periods of precipitation in the spring and summer. Mean annual temperature is 36 degrees F. and mean summer temperature is 52 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Rawah soils and the Tealson soils. Tealson soils have a mollic epipedon and lack an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; medium to slow runoff; moderate permeability.
USE AND VEGETATION: These soils are used for grazing. Native vegetation is sagebrush, Junegrass, fescue, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: High mountain valleys of Colorado. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Jackson County, Colorado, 1973.
REMARKS: Last updated by the state 11/73.