LOCATION COIT NVEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Coit loam - rangeland. (Colors are for dry soils unless otherwise noted.)
All--0 to 2 inches; gray (l0YR 5/l) loam, very dark grayish brown (l0YR 3/2) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, and few fine roots; many very fine interstitial, and common very fine, and few fine tubular pores; effervescent; mildly alkaline (pH 7.8); abrupt smooth boundary. (l to 4 inches thick.)
Al2--2 to l0 inches; grayish brown (l0YR 5/2) loam, very dark gray (l0YR 3/l) moist; weak coarse prismatic structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine interstitial, and common very fine tubular pores; strongly effer vescent; moderately alkaline (pH 8.4); clear smooth boundary. (5 to l0 inches thick.)
Al3--l0 to l8 inches; grayish brown (l0YR 5/2) loam, very dark grayish brown (l0YR 5/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine interstitial pores; violently effervescent; moderately alkaline (pH 8.4); gradual smooth boundary. (6 to l5 inches thick.)
Al4--l8 to 38 inches; grayish brown (l0YR 5/2) silt loam, very dark grayish brown (l0YR 3/2) moist, with few medium faint very dark brown (l0YR 2/2) mottles, moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; few very fine tubular and interstitial pores; slightly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (l0 to 20 inches thick.)
C--38 to 60 inches; gray (l0YR 5/l) fine sandy loam, very dark grayish brown (l0YR 3/2) moist, with common faint very dark brown (l0YR 2/2) mottles, moist; massive; hard, friable, slightly sticky and plastic; few very fine, fine and medium roots; few very fine interstitial pores; slightly effer vescent; mildly alkaline (pH 7.8).
TYPE LOCATION: Eureka County, Nevada. Approximately 600 feet south and 900 feet west of the apparent northeast corner of Section ll, T. 3l N., R. 49 E.
RANGE IN CHARACTERISTICS: These soils are moist with a high water table in the winter and spring months but are dry continuously between the depths of 5 and l5 inches in the late summer and fall of most years. Mean annual soil temperature is 49 to 5l degrees F. Thickness of the mollic epipedon ranges from 20 to more than 40 inches. The profile is stratified and commonly contains strata of loam, silt loam, clay loam, silty clay loam, very fine sandy loam, fine sandy loam or sandy loam. A few thin strata of silty clay or clay, or loamy sand or sand are in some pedons. The control section texture when mixed is commonly loam, silt loam or light clay loam and contains more than l5 percent sand coarser than very fine sand. These soils are calcareous, ranging from slightly effervescent, mainly below 36 inches, to violently effervescent in the upper profile. A few very hard lime concretions are below 36 inches in some pedons. Reaction is mildly to strongly alkaline and usually increases with depth. Some areas are salt and alkali affected.
The Al horizon has hues of l0YR or 2.5Y, values of 4 or 5 dry and 2 or 3 moist, and chroma of l or 2. Structure is weak or moderate, very fine to medium, granular or subangular blocky or weak, medium or coarse prismatic, or is massive.
The C horizon has hues of l0YR OR 2.5Y, values of 4 to 6 dry and 3 or 4 moist, and chroma of l to 3. Those horizons with values of 4 or 5 dry and 3 moist are hard and massive when dry.
COMPETING SERIES: These are the Birdow, Blackrock, Dagor, Eastcan, Goose Creek, Lakeview, Monroe, Soquel, and Willowdale series. Birdow, Blackrock, Dagor, Monroe, and Willowdale soils are well drained and in addition Dagor soils are not calcareous. Eastcan soils are moderately well drained with a water table below 40 inches most of the year. Goose Creek and Soquel soils are not calcareous. Lakeview soils have a cambic horizon and are not calcareous in the solum.
GEOGRAPHIC SETTING: The Coit soils are on flood plains at elevations of 4,400 to 4,800 feet. Slopes are 0 to l percent. The soils formed in loamy alluvium from mixed rock sources. The climate is cool and semi-arid. The mean annual precipitation is 6 to 8 inches; mean annual temperature is 47 to 49 degrees F.; and the frost-free season is l00 to l20 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Humboldt, Ocala and Rose Creek soils. Humbolt soils have fine textured control sections. Ocala soils have fine-silty control sections and ochric epipedons. Rose Creek soils have coarse-loamy control sections.
DRAINAGE AND PERMEABILITY: Poorly drained. The water table is about 20 inches during the spring months, and is lowest during summer and fall months when it may drop to a depth of 5 to 6 feet. Some areas have been partially drained by entrenchment of stream channels. Overflow commonly occurs on an average of l in every 4 to 5 years. Very slow runoff; moderate permeability.
USE AND VEGETATION: Rangeland and wildlife habitat with small areas irrigated and native grasses cut for meadow hay. The vegetation is mainly creeping wildrye with some saltgrass in the saline and alkali affected areas. Drained areas support big sagebrush.
DISTRIBUTION AND EXTENT: North-central Nevada. Soils of this series are of small extent.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Eureka County, (Tuscarora Mountain Area), Nevada, l979.
REMARKS:
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.