LOCATION GREYSTOKE OR

Established Series
Rev. DRJ/TDT
01/2023

GREYSTOKE SERIES

The Greystoke series consists of deep, well drained soils that formed in residuum and colluvium weathered from andesite or basalt. The soils are on plateaus and hillslopes and have slopes of 1 to 75 percent. The mean annual temperature is about 44 degrees F, and the mean annual precipitation is about 25 inches.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Pachic Ultic Argixerolls

TYPICAL PEDON: Greystoke stony loam, forested. (Colors are for moist soil unless otherwise noted.)

Oi--0 inches to 2; partially decomposed needles and twigs.

A1--2 to 5 inches; dark reddish brown (5YR 2.5/2) stony loam, brown (7.5YR 4/3) dry; moderate very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and common fine, medium, and coarse roots; many very fine irregular pores; 10 percent gravel and 25 percent cobbles and stones; moderately acid (pH 5.8); abrupt smooth boundary. (2 to 12 inches thick)

A2--5 to 15 inches; dark reddish brown (5YR 3/2) very cobbly loam, brown (7.5YR 4/3) dry; moderate very fine and fine subangular blocky structure parting to moderate fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and common fine, medium, and coarse roots; many very fine irregular pores; 15 percent gravel and 30 percent cobbles and stones; moderately acid (pH 5.6); abrupt wavy boundary. (0 to 16 inches thick)

BA--15 to 25 inches; dark reddish brown (5YR 3/3) very cobbly loam, brown (7.5YR 4/4) dry; moderate very fine and fine angular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine and few fine, medium, and coarse roots; common very fine tubular pores; 20 percent gravel and 30 percent cobbles and stones; moderately acid (pH 5.6); clear wavy boundary. (0 to 16 inches thick)

Bt--25 to 44 inches; dark reddish brown (5YR 3/3) extremely gravelly clay loam, brown (7.5YR 4/4) dry; moderate very fine and fine angular blocky structure; hard, firm, sticky and plastic; few very fine, fine, and medium roots; common very fine tubular pores; few thin clay films on ped faces and in pores; 50 percent gravel and 20 percent cobbles; moderately acid (pH 5.6); clear wavy boundary. (10 to 30 inches thick)

Cr--44 inches; weathered andesite.

TYPE LOCATION: Klamath County, Oregon; approximately 600 feet north and 1,300 feet east of the southwest corner of sec. 32, T. 39 S., R. 7 E., W.M.

RANGE IN CHARACTERISTICS: These soils are usually moist but are dry in the moisture control section for 45 to 80 consecutive days in the four months that follow the summer solstice. The mean annual soil temperature ranges from 42 to 47 degrees F. Base saturation (sum of cations) is less than 75 percent in some parts of the upper 30 inches of the solum. The mollic epipedon is 20 to 30 inches thick. Depth to weathered andesite is 40 to 60 inches. The particle-size control section averages 27 to 35 percent clay, 25 to 50 percent gravel, and 10 to 30 percent cobbles and stones.

The A horizon has hue of 7.5YR, 5YR, or 2.5YR, value of 2 or 3 moist, and chroma of 2 or 3 moist, and 3 or 4 dry. It has 10 to 20 percent gravel and 10 to 30 percent cobbles and stones. It is moderately acid or slightly acid.

The BA horizon has hue of 7.5YR, 5YR, or 2.5YR and chroma of 2 through 4 moist and 3 or 4 dry. It has 20 to 30 percent clay, 10 to 30 percent gravel, and 10 to 30 percent cobbles and stones. It is a very cobbly loam, very gravelly loam, or cobbly clay loam. It is moderately acid or slightly acid.

The Bt horizon has hue of 7.5YR, 5YR, or 2.5YR and chroma of 3 or 4 moist and dry. It has 27 to 35 percent clay, 25 to 50 percent gravel, and 10 to 30 percent cobbles and stones. It is a very cobbly clay loam, very gravelly clay loam, or extremely gravelly clay loam. It is strongly acid to slightly acid.

COMPETING SERIES: These are the Getaway, Smarts and Toncana series. Getaway soils lack hue of 7.5YR or redder in the A horizon, have a lithic contact at 40 to 60 inches, the fine earth fraction of the A horizon is silt loam and is loess and a lithologic discontinuity is identified at the A/2Bt horizons.
The Smarts and Toncana soils have rock fragments composed of conglomerate, limestone, sandstone and quartzite. Smarts soils lack hues of redder than 7.5YR. Toncana soils have a solum 55 to over 60 inches thick.

GEOGRAPHIC SETTING: Greystoke soils are on plateaus and hillslopes at elevations of 3,000 to 5,200 feet. These soils formed in residuum and colluvium derived from andesite or basalt and small amounts of volcanic ash. The mean annual precipitation is 20 to 30 inches. The mean annual temperature is 42 to 46 degrees F. The frost-free period is less than 100 days. Slopes range from 1 to 75 percent.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bly, Booth, Kanutchan, Kanutchan Variant, Merlin, Pinehurst, and Royst series. Bly and Pinehurst soils are fine-loamy. Booth, Kanutchan, and Kanutchan Variant soils are fine. Merlin soils are shallow. Royst soils are clayey-skeletal and are moderately deep.

DRAINAGE AND PERMEABILITY: Well drained; slow to very rapid runoff; moderately slow permeability.

USE AND VEGETATION: These soils are used for timber production and livestock grazing. Native vegetation includes an overstory of Douglas fir, ponderosa pine, incense cedar, sugar pine, and white fir. Understory includes western fescue, tall Oregon grape, pachystima, greenleaf manzanita, snowberry, Pacific serviceberry, spreading dogbane, and prostrate ceanothus.

DISTRIBUTION AND EXTENT: Southwestern Oregon. The series is moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Jackson County Area, Oregon (Klamath County part); 1988.

REMARKS:
Diagnostic horizons and features:
- Mollic epipedon - 2 to 25 inches.
- Argillic horizon - 25 to 44 inches.

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.

ADDITIONAL DATA: This pedon was lab. sampled at 2-5, 5-15, 15-25 and 25-44 inches for organic carbon, base saturation and particle-size.

National Cooperative Soil Survey
U.S.A.