LOCATION YANCY OR

Established Series
Rev. JSC/AON
05/2012

YANCY SERIES

The Yancy series consists of shallow, well drained soils that formed in gravelly sediments weathered from basalt, tuff, and felsite. These soils are on terraces, benches and tablelands, and have slopes of 0 to 8 percent. The mean annual precipitation is about 16 inches and the mean annual air temperature is about 44 degrees F.

TAXONOMIC CLASS: Clayey, smectitic, frigid, shallow Palexerollic Durixerolls

TYPICAL PEDON: Yancy clay loam, rangeland. (Colors are for moist soil unless otherwise noted.)

A--0 to 2 inches; very dark grayish brown (10YR 3/2) clay loam, grayish brown (10YR 5/2) dry; weak thin platy structure; slightly hard, friable, sticky and plastic; common very fine roots; many very fine pores; about 50 percent cover of fine gravel on surface; neutral (pH 6.6); clear wavy boundary. (1 to 5 inches thick)

Bt1--2 to 6 inches; very dark grayish brown (10YR 3/2) clay loam, brown (10YR 5/3) dry; dark brown (10YR 3/3) rubbed; weak medium subangular blocky structure; hard, firm, sticky and plastic; common very fine roots; common very fine tubular pores; about 15 percent gravel; common thin clay films on peds and gravel and in pores; neutral (pH 6.6); clear wavy boundary. (2 to 6 inches thick)

Bt2--6 to 12 inches; dark brown (10YR 3/3) gravelly clay, brown (10YR 5/3) dry; moderate fine subangular blocky structure; very hard, very firm, very sticky and very plastic; common very fine roots; many very fine tubular pores; about 20 percent gravel; many pressure faces on peds, thick clay films on gravel, thin clay films in pores; neutral (pH 6.8); clear wavy boundary. (4 to 8 inches thick)

Bt3--12 to 14 inches; dark yellowish brown (10YR 4/4) very gravelly clay, yellowish brown (10YR 5/4) dry; moderate fine angular blocky structure; very hard, very firm, very sticky and very plastic; common very fine roots; many very fine tubular pores; about 40 percent gravel; nearly continuous pressure faces on peds, thick clay films on gravel; thin clay films in pores; neutral (pH 6.8); abrupt smooth boundary. (0 to 3 inches thick)

Bqm--14 to 60 inches; dark yellowish brown (10YR 4/4) and yellowish brown (10YR 5/4) very gravelly duripan, yellow (10YR 8/6) dry; massive; indurated to 24 inches, strongly cemented below; white (10YR 8/2) dry, opaline cap from 2 to 10 millimeters thick at top of duripan.

TYPE LOCATION: Klamath County, Oregon; about 1.5 miles south of the town of Sprague River; 2,100 feet north and 3,200 feet east of the southwest corner section 22, T. 36 S., R. 10 E.

RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 44 to 46 degrees F. Soils are usually moist but are dry about 75 to 90 days in the 4-month period following the summer solstice. Depth to the duripan ranges from 12 to 20 inches. Depth to bedrock is more than 60 inches.

The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 moist and 1 or 2 dry.

The B2t horizon has value of 2 or 3 moist in the upper part and 3 or 4 in the lower part, 4 or 5 dry, and chroma of 2 through 4 moist and dry. It has 35 to 50 percent clay and 20 to 40 percent sand. This horizon averages 5 to 25 percent gravel. Some pedons have up to 40 percent gravel in the lower part.

Duripans range from 1 to more than 4 feet in thickness and have indurated opaline caps 1 millimeter to more than 1 centimeter thick.

COMPETING SERIES: These are the Bieber, Espil, Hibbard, Oxbow, Oxwall, Powley, Salisbury, and Tanner series. Bieber, Hibbard, Oxbow, Oxwall, and Salisbury soils are mesic. Also, the Bieber soils are usually dry and the Hibbard, Oxbow and Salisbury soils have duripans at depths over 20 inches. Espil soils are usually dry and have duripans at depths of 8 to 14 inches. Powley soils are usually dry, have A2 horizons and have A&B horizons with uncoated sand grains on faces of peds. Tanner soils have bedrock at depths less than 40 inches and a duripan immediately above bedrock but deeper than 20 inches.

GEOGRAPHIC SETTING: Yancy soils are on old high terraces, tablelands and benches. Elevations are 4,200 to 5,500 feet. The soils formed in gravelly sediments weathered from basalt, tuff, and felsite. The climate is subhumid with cool dry summers and cold moist winters. Average annual precipitation is 15 to 18 inches. The mean January temperature is 27 degrees F., the mean July temperature is 63 degrees F., and the average annual temperature is 43 to 45 degrees F. The frost-free period is about 50 to 70 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bly, Merlin, and Yonna soils. Bly soils lack duripans. Merlin soils are underlain by bedrock at depths of 10 to 20 inches. Yonna soils lack mollic epipedon and duripans.

DRAINAGE AND PERMEABILITY: Well drained, medium or rapid runoff; slow permeability.

USE AND VEGETATION: The soils are used for range, irrigated hay, pasture, and homesites. Vegetation includes low sagebrush, phlox, Idaho fescue, and Sandberg bluegrass.

DISTRIBUTION AND EXTENT: Basins and tablelands in south-central Oregon. The series is moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Klamath County, Oregon, 1977.

NSTH 17, RECLASSIFICATION ONLY, 3/95

National Cooperative Soil Survey
U.S.A.