LOCATION LAMARSH WYTentative Series
TAXONOMIC CLASS: Mixed, frigid Ustic Torripsamments
TYPICAL PEDON: LaMarsh sandy loam - grassland. (Colors are for dry soil unless otherwise noted)
A1--0 to 5 inches; grayish brown (2.5Y 5/2) sandy loam, dark grayish brown (10YR 4/2) moist; weak fine granular structure; soft, very friable, nonplastic, nonsticky; noncalcareous; neutral. pHK 7.0 (BTB); clear smooth boundary. (2 to 10 inches thick)
C--5 to 24 inches; light olive brown (2.5Y 5/4) loamy sand, olive brown (2.5Y 4/4) moist; single grained; loose, nonplastic, nonsticky; noncalcareous; mildly alkaline, pH 7.4 (PR); abrupt smooth boundary. (10 to 38 inches thick)
R--24 to 40 inches; hard calcareous sandstone.
TYPE LOCATION: Carbon County, Wyoming. Center sec. 12, T. 19 N., R. 87 W.
RANGE IN CHARACTERISTICS: Unless otherwise noted the entire range of properties permissible or the subgroup and family in which the series has been placed applies to the series as well. These soils are noncalcareous throughout except that thin and discontinuously calcareous subhorizons may occur immediately above the bedrock. Depth to the lithic contact ranges from 20 to 40 inches. Exchangeable sodium ranges from 0 to 15 percent in the control section. Content of coarse fragments ranges from 0 to 15 percent in a major part of the control section and coarse fragments ranging from 1/2 to 3 inches in diameter predominate. Mottling within the control section may range from no mottling to a few faint mottles but if the soil is consistently mottled the base chroma of the matrix material must be more than 2. The control section should be uniform with only minor stratification. Color of the A horizon may range in hue from 5Y to 7.5YR, in value from 5 to 7 dry or 3 to 6 moist8st, and in chroma from 1 to 4. Reaction normally ranges from neutral to mildly alkaline (1:5 dilution unbuffered organic dye). Hue of the C horizon ranges from 5Y to 7.5YR. Reaction normally ranges from neutral to mildly alkaline (1:5 dilution unbuffered organic dye). Texture ranges from loamy sand to sand.
COMPETING SERIES: These include the Cothran, Tusler, and Yetull series. The Cothran series differs in lacking bedrock above 40 inches. The Tusler series differs in having a paralithic rather than a lithic contact, and in being calcareous. The Yetull soils differ in being calcareous and in having no bedrock above 40 inches.
GEOGRAPHIC SETTING: The LaMarsh series occurs on gently to steeply sloping upland hills and ridges. Slopes typically range from about 2 to 40 or more percent. The soil is developing in moderately thin noncalcareous coarse textured materials weathered from sandstone and locally wind reworked. At the type location the mean annual precipitation is about 14 inches with peak periods of precipitation occurring in the spring and early summer months. Mean annual air temperature is 40 degrees F., mean summer air temperature is 62 degrees F., mean annual soil temperature is 44 degrees F., and mean summer soil temperature is 63 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Cotopaxie and Spool series. The Cotopaxie series differs in occurring in dryer areas and in lacking bedrock above 40 inches. The Spool series differs in having bedrock above 10 inches.
DRAINAGE AND PERMEABILITY: Well to somewhat excessively drained. Runoff is slow to very slow. Permeability is rapid to very rapid.
USE AND VEGETATION: They are used principally as native pastureland. Native vegetation includes big sage, needle-and-thread grass, threadleaf sedge, and rabbit brush.
DISTRIBUTION AND EXTENT: Present known distribution limited to southern and central Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Sage Creek area, Carbon County, Wyoming. Series name is a local place name.
OSED scanned by NSSQA. Last revised by state on 2/72.