LOCATION CORA               WY

Tentative Series
Rev. AJC
11/2002

CORA SERIES

This series consists of very poorly or poorly drained, moderately fine textured, noncalcareous, Wiesenbodens developing in depressions on high terraces in old outwash fans, or poorly drained outwash channels, in moderately coarse textured, gleyed, neutral to mildly alkaline alluvium or glacial outwash sediments derived mainly from granite, quartzite, gneiss, and sandstone bedrocks, and overlying coarse sand and gravel substratum. Normally these soils have light colored, gleyed, thin A horizons, no textural B horizons, and thin to moderately thick, gleyed, C horizons overlying clean sand and gravel substratum. At their type location they are developing in an area having average annual precipitation of 12 inches, an average annual snowfall of 50 inches, a mean annual temperature of 35 degrees, and a mean summer temperature of 56.6 degrees. They occur in association with the soils of the New fork series from which they differ from being finer textured, more strongly gleyed, and lighter colored. They differ from the Dagmar soils in being finer textured, and in being noncalcareous or very weakly calcareous. They differ from the Teepee soils in being lighter colored and strongly gleyed. These are relatively unimportant soils of low agricultural value occurring in the high mountain areas of the western states.

TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive, nonacid Histic Cryaquepts

TYPICAL PEDON: Cora clay loam

Ae--3 to 0 inches; A fiber mat of partially decomposed and recently deposited plant remains.

Alg--0 to 12 inches; Gray (2.5Y 6/1 dry) to dark gray (2.5Y 4/1 moist) clay loam; very hard when dry, friable when moist; massive to very weak very coarse granular structure; noncalcareous, slightly acid to neutral reaction; there are common numbers of large distinct 10YR 3/4 mottles; lower boundary gradual and smooth. 6-15n thick

B2g--12-28 inches; Pale olive (5Y 6/3 dry) to olive (5Y 5/3 moist) clay loam or heavy sandy clay loam; very hard when dry, friable when moist; massive; noncalcareous, slightly acid to neutral reaction; many large prominent (5Y 6/4) mottles making up 30 to 40 percent of the soil mass; lower boundary gradual and smooth. 12-20 inches thick

IICg--28-60 inches; Light gray (5Y 7/2 dry) to olive gray (5Y 5/2 moist) coarse sand and cobble.

TYPE LOCATION: Approximately 700 feet west of the northeast corner of Sec. 28, T. 34N., R. 109W., Sublette County, Wyoming. One and .2 mile northeast of Pinedale on the Willow Lake road and approximately .3 mile north along the small trail leading from the first cattle guard to the first gate across the trail, and then 300 feet west along the fence.

RANGE IN CHARACTERISTICS: Color of the A horizon may range in hue from 5Y to 10YR, in chroma from neutral to 2, and in value from 5.5 to 7 when dry and 3.5 to 5 when moist. Hue of the G horizon may range from 2.5Y to 10Y. The depth to the underlying sand and gravel substratum may range from 12 to 40 inches, and the depth to the fluctuating water table may range from 0 to 24 inches depending upon the season of the year. Evidence of poor drainage in the surface A horizon may range from a uniform gleyed color to moderate or weak mottling. Texture of the C horizon may range in clay from 20 to 40 percent, in silt from 0 to 60 percent, and in sand from 20 to 60 percent. Combinations of characteristics not entirely within the range listed above but representative of the normal physical and chemical character, and the kind and degree of genesis normally attributed to these soils should not be excluded for lack of total conformity.

GEOGRAPHIC SETTING: Level to depressed or ponded depressions, outwash channels, or old stream channels.

DRAINAGE AND PERMEABILITY: Poor to very poorly drained. Surface drainage is very slow or ponded; internal permeability is very slow due to the standing water tables found below these soils.

USE AND VEGETATION: Pasture and hay land. Sedges, rushes, and water-loving grasses. Dutch and alsike clover have taken over on some of the better drained areas.

DISTRIBUTION AND EXTENT: Present known distribution limited to west central Wyoming, however, it is anticipated that this series will be useful to the cold, intermountain areas of Colorado, Wyoming and Montana.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Pinedale Soil Conservation District, Sublette County, Wyoming, 1942.

OSED scanned by NSSQA. Last revised by state on 1/60.

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National Cooperative Soil Survey
U.S.A.