LOCATION STACKYARDS OR

Established Series
Rev. MHF/CDJ/RWL
06/2011

STACKYARDS SERIES

The Stackyards series consists of deep, well drained soils formed in colluvium and residuum from metasedimentary or metavolcanic rock types. Stackyards soils are on north-facing side slopes of mountains. Slopes are 30 to 90 percent. The mean annual precipitation is about 145 inches and the mean annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Typic Humudepts

TYPICAL PEDON: Stackyards extremely gravelly loam - woodland, on 47 percent north-facing slope at 3,300 feet elevation. (When described on November 6, 1989, the soil profile was moist throughout. Colors are for moist soil unless otherwise noted.)

Oi--0 to 2 inches; slightly decomposed needles, leaves, twigs, and woody materials.

A--2 to 12 inches; very dark grayish brown (10YR 3/2) extremely gravelly loam, grayish brown (10YR 5/2) dry; weak fine subangular blocky structure parting to weak fine granular; soft, very friable, nonsticky and nonplastic; many very fine and fine, and few medium and coarse roots; common very fine irregular pores; 50 percent gravel and 15 percent cobbles; strongly acid (pH 5.2); clear wavy boundary. (10 to 16 inches thick)

Bw1--12 to 17 inches; dark brown (10YR 3/3) extremely cobbly clay loam, pale brown (10YR 6/3) dry; moderate very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium, and few coarse roots; many very fine tubular pores; 40 percent gravel and 25 percent cobbles; strongly acid (pH 5.2); clear wavy boundary.

Bw2--17 to 25 inches; dark yellowish brown (10YR 3/4) extremely cobbly loam, pale brown (10YR 6/3) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium, and few coarse roots; many very fine tubular pores; 25 percent gravel and 40 percent cobbles; moderately acid (pH 5.6); clear wavy boundary.

Bw3--25 to 46 inches; dark yellowish brown (10YR 3/4) extremely cobbly clay loam, pale brown (10YR 6/3) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few medium and coarse roots; many very fine tubular pores; 25 percent gravel and 40 percent cobbles; moderately acid (pH 5.6); abrupt wavy boundary. (Combined thickness of the Bw horizon ranges from 30 to 44 inches)

R--46 inches; fractured sandstone.

TYPE LOCATION: Curry County, Oregon; about 1,650 feet north and 1,650 feet west of the southeast corner of section 2, T. 37 S., R. 13 W. (Latitude 42 degrees, 24 minutes, 04 seconds N.; Longitude 124 degrees, 12 minutes, 29 seconds W.)

RANGE IN CHARACTERISTICS: The mean annual soil temperature is 41 to 46 degrees F. The soils are usually moist but are dry in all parts of the moisture control section for less than 45 consecutive days between depths of 4 and 12 inches in the four months following the summer solstice. The particle size control section averages between 25 and 35 percent clay and 50 to 85 percent rock fragments. Depth to bedrock and solum thickness is 40 to 60 inches. The umbric epipedon is 10 to 20 inches thick and may include the upper part of the Bw horizon. The profile is strongly to moderately acid throughout. Hue is 10YR or 7.5YR.

The A horizon has value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. It is extremely gravelly loam with 10 to 20 percent clay. It has 50 to 60 percent gravel and 5 to 15 percent cobbles.

The Bw horizon has value of 3 to 5 moist, 5 to 7 dry and chroma of 3 or 4 moist and dry. It is extremely cobbly loam, extremely cobbly clay loam or very cobbly clay loam with 25 to 35 percent clay. It has 25 to 40 percent gravel, 25 to 40 percent cobbles and 0 to 5 percent stones.

COMPETING SERIES: These are the Balsam, Gamelake, Illahee, and Scaredman soils. Balsam soils contain rock fragments of gneiss or granite origin and few to common mica flakes throughout the particle-size control section. Gamelake soils are very deep and have 5 to 15 percent clay and more than 30 percent coarser than fine sand in the particle size control section. Illahee soils have 15 to 25 percent clay in the particle-size control section. Scaredman soils are 20 to 40 inches deep to bedrock.

GEOGRAPHIC SETTING: The Stackyards soils are on metastable to active north-facing side slopes of mountains. Slopes are 30 to 90 percent. The soils formed in colluvium and residuum derived from metasedimentary or metavolcanic rock types of the Dothan Formation. Elevations are 2,500 to 3,800 feet. The climate is characterized by cool wet winters and warm moist summers. The mean annual precipitation is 130 to 160 inches. The mean annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bobsgarden, Pyrady, Euchrand, Rilea, Yorel, and Zalea soils. Bobsgarden soils are very deep and occur on broad ridgetops and adjacent south-facing slopes of mountains. Euchrand soils occur on side slopes of mountains, are 10 to 20 inches deep to bedrock, and have an ochric epipedon. Pyrady soils occur on ridgetops and side slopes of mountains, have argillic horizons, are greater than 60 inches deep to bedrock, and are moderately well drained. Rilea and Yorel soils occur on broad ridgetops or sideslopes of mountains, are 20 to 40 inches deep to bedrock, and have ochric epipedons. In addition, Yorel soils are fine-loamy. Zalea soils occur on ridgetops and side slopes of mountains, are 20 to 40 inches deep to bedrock, and are fine-loamy.

DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.

USE AND VEGETATION: The soils are used for timber production, watershed, recreation, and wildlife habitat. The native vegetation is Douglas fir, golden chinkapin, tanoak, Pacific madrone, Pacific rhododendron, salal, cascade Oregongrape, Sadler oak, western swordfern, western princes pine, western rattlesnake plantain, common beargrass, and deerfoot vanillaleaf.

DISTRIBUTION AND EXTENT: Mountainous areas of southwestern Oregon; MLRA 1. The series is not extensive.

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

SERIES ESTABLISHED: Douglas County, Oregon, 1994.

REMARKS: Diagnostic horizons and features recognized in this pedon include:

Umbric epipedon - from 2 to 12 inches (A horizon).

Cambic horizon - from a depth of 12 to 46 inches (Bw1, Bw2, and Bw3 horizons).

Particle-size control section - from 12 to 42 inches (Bw1, Bw2, and part of Bw3 horizon) with a weighted average of 65 percent rock fragments.

ADDITIONAL DATA: Partial laboratory data available for pedon 90P 312, sample 90P1908 from Curry County, Oregon sampled by NSSL at Lincoln, Nebraska - 3/90.

National Cooperative Soil Survey
U.S.A.