LOCATION PESMORE WY+UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, micaceous, frigid Torriorthentic Haplustolls
TYPICAL PEDON: Pesmore very channery sandy loam on a southeast facing smooth slope of 20 percent under native range. (Colors are for dry soil unless otherwise stated.)
A--0 to 3 inches; dark grayish brown (2.5Y 4/2) very channery sandy loam, very dark grayish brown (2.5Y 3/2) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and common medium roots; 40 percent channers; mildly alkaline; abrupt smooth boundary. (2 to 6 inches thick)
Bw--3 to 10 inches; brown (10YR 4/3) very channery loam, dark brown (10YR 3/3) moist; weak coarse prismatic structure parting to weak medium and fine subangular blocky; slightly hard, very friable, nonsticky and nonplastic; many very fine, fine, and common medium roots; 40 percent channers; mildly alkaline; clear wavy boundary. (4 to 11 inches thick)
Bk1--10 to 12 inches; olive brown (2.5Y 4/4) very channery loam, dark grayish brown (2.5Y 4/2) moist; weak coarse prismatic structure parting to weak medium and fine subangular blocky; slightly hard, very friable, nonsticky and nonplastic; common very fine, fine and medium roots; strongly effervescent, carbonates disseminated and as thin encrustations on underside of rock fragments; 40 percent channers; moderately alkaline; clear wavy boundary.
Bk2--12 to 20 inches; light brownish gray (2.5Y 6/2) very channery loam, grayish brown (2.5Y 5/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common very fine, fine, and medium roots; violently effervescent, carbonates disseminated and as many medium soft masses; 50 percent channers; moderately alkaline; clear wavy boundary. (Combined thickness of the Bk horizons is 6 to 15 inches.)
C--20 to 24 inches; olive (5Y 5/3) very channery loam, olive (5Y 4/3) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine, fine and medium roots; slightly effervescent, carbonates disseminated; 50 percent channers; moderately alkaline; abrupt wavy boundary. (0 to 10 inches thick)
R--24 inches; hard schist.
TYPE LOCATION: Fremont County, Wyoming; about 12 miles east and 14 miles north of Shoshoni; 1,700 feet east and 1,875 feet north of the SW corner of sec. 22, T. 40 N. R. 92 W.
RANGE IN CHARACTERISTICS: Depth to bedrock and lithic contact ranges from 20 to 40 inches. The mollic epipedon is 7 to 15 inches thick and contains 2 to 4 percent organic matter throughout. The mean annual soil temperature ranges from 40 to 47 degrees F., and the mean summer soil temperature ranges from 59 to 63 degrees F. The particle-size control section has a matrix texture of loam, clay loam, sandy clay loam, and less commonly sandy loam with 18 to 35 percent clay and 35 to 70 percent sand. Muauous schist and granite make up a major part of the medium and coarse sand grains. The particle-size control section averages 35 to 60 percent coarse fragments of semirounded pebbles, channers, or cobble.
The A horizon has hue of 2.5Y through 7.5YR, value of 4 or 5 dry and 2 or 3 moist, and chroma of 2 through 4 dry and 2 or 3 moist. Matrix texture is sandy loam or loam modified with 10 to 40 percent channers or pebbles. Reaction is neutral or mildly alkaline.
The Bw horizon has hue of 2.5Y through 7.5YR, value of 4 or 5 dry, 3 or 4 moist, and chroma of 2 through 4 dry and 2 or 3 moist. Matrix texture is typically loam, clay loam, sandy loam, or sandy clay loam with 15 to 60 percent pebbles or channers. Reaction is neutral through moderately alkaline.
The Bk and C horizons have hue of 5Y through 7.5YR, value of 3 through 6 dry, 3 through 5 moist, and chroma of 2 through 6 dry and moist. Matrix texture is loam, clay loam, sandy clay loam, and less commonly sandy loam with 35 to 60 percent pebbles or channers. Reaction is moderately alkaline or strongly alkaline.
COMPETING SERIES: These are the Datino, Labre, Perma, Peso, Pesowyo, Sandia, and Veatch series. Datino, Labre, and Perma have bedrock deeper than 60 inches. Peso and Pesowyo soils formed in material weathered from limestone and occur in areas of 15- to 19-inch precipitation. Sandia soils are neutral throughout and have bedrock at 40 to 60 inches. Veatch soils formed in material weathered from sandstone and have 8 to 18 percent clay in the control section.
GEOGRAPHIC SETTING: Pesmore soils are on cuesta dipslopes and hillslopes that have a plane or convex surface. The slope gradient is commonly 15 to 45 percent but the range is 10 to 90 percent. The soils formed in medium textured material derived from Precambrian schist, gneiss, and granite. The underlying rock is hard schist, gneiss, or granite. Rock outcrop is common. Elevation is 6,000 to 7,800 feet. The mean annual temperature is 39 to 45 degrees F., and the mean annual precipitation is 10 to 14 inches. The estimated frost-free season is 85 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ashbon, Bosler, Mitten, Rock River, Ryan Park, and Satanka series. Ashbon and Mitten soils have bedrock above a depth of 20 inches. In addition, Ashbon soils lack a mollic epipedon. Bosler, Rock River, and Ryan Park soils have bedrock below a depth of 60 inches, have an argillic horizon, and lack a mollic epipedon. Satanka soils lack a mollic epipedon and have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained or somewhat excessively drained; runoff is slow or medium; permeability is moderate.
USE AND VEGETATION: Native range. Vegetation is needleandthread bluebunch wheatgrass, prairie junegrass, Indian ricegrass, and big sagebrush.
DISTRIBUTION AND EXTENT: Central Wyoming. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Fremont County, Wyoming, East Part; 1985.
The mineralogy class was changed from paramicaceous to micaceous in 07/2010 by the National Soil Survey Center on request of the responsible MLRA regional office. The change was necessary based on the eleventh edition of the Keys to Soil Taxonomy, 2010.