LOCATION GEPPERT OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Typic Dystroxerepts
TYPICAL PEDON: Geppert very cobbly loam - under mixed conifer forest. (Colors are for moist soil unless otherwise indicated.)
O--1/2 inch to 0; partially decomposed litter of needles, leaves
and twigs.
A1--0 to 4 inches; dark reddish brown (5YR 3/3) very cobbly loam, dark brown (7.5YR 3/4) dry; weak fine subangular blocky and moderate medium granular structure; soft, friable, slightly sticky and slightly plastic; many fine and very fine and few medium roots; many irregular pores; 25 percent cobbles and 15 percent gravel; neutral (pH 6.6); clear smooth boundary. (2 to 8 inches thick)
A2--4 to 13 inches; dark reddish brown (5YR 3/4) very cobbly loam, dark brown (7.5YR 3/4) dry; weak medium subangular blocky parting to moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine and few medium roots; many irregular pores; 30 percent cobbles and 15 percent gravel; slightly acid (pH 6.4); clear smooth boundary. (4 to 10 inches thick)
Bw1--13 to 24 inches; dark reddish brown (5YR 3/4) extremely cobbly clay loam, dark reddish gray (5YR 4/2) dry; moderate medium subangular blocky structure; hard, friable, sticky and plastic; common fine and medium and few coarse roots; many very fine tubular pores; 50 percent cobbles and 15 percent gravel; slightly acid (pH 6.4); clear wavy boundary. (6 to 15 inches thick)
Bw2--24 to 30 inches; dark reddish brown (5YR 3/4) extremely cobbly clay loam, dark reddish gray (5YR 4/2) dry; moderate medium subangular blocky structure; hard, firm, sticky and plastic; few fine roots; common very fine tubular pores; common black stains on rock fragments; 60 percent cobbles and 20 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (5 to 10 inches thick)
2Cr--30 inches; partially weathered andesite.
TYPE LOCATION: Jackson County, Oregon; about 2 miles north of Butte Falls, approximately 1,800 feet north and 1,450 feet west of the southeast corner of sec. 35, T. 34 S., R. 2 E.
RANGE IN CHARACTERISTICS: The soils are usually moist, but are dry between 4 and 12 inches for 60 to 90 consecutive days in the four months following the summer solstice. The depth to partially weathered bedrock is 20 to 40 inches. The particle-size control section averages 50 to 80 percent rock fragments of which 40 to 60 percent are cobbles and 10 to 20 percent are gravel and it averages 25 to 35 percent clay. The mean annual soil temperature is 47 to 54 degrees F.
The A horizon has hue of 5YR or 7.5YR, value of 2 through 4 moist and 3 through 5 dry, and chroma of 3 or 4 moist and 2 through 4 dry. It is slightly acid to neutral.
The Bw horizon has hue of 2.5YR, 5YR, or 7.5YR, value of 3 or 4 moist and 4 or 5 dry, and chroma of 3 through 6 moist and dry. It is very cobbly clay loam, extremely cobbly clay loam, or extremely cobbly loam. It is moderately acid to slightly acid.
COMPETING SERIES: These are the Atring, Baldhill, Beekman, Clallam, Farber, Hartless, Inskip, Kanid, Kindig, Mayacama, Neuns, Sheetiron, Straight, Terbies, Vena and Woodin series. Atring soils are dry in the moisture control section 45 to 60 consecutive days; in addition, the coarse fragments are primarily gravel size and the solum has hue of 10YR or 7.5YR. The Baldhill, Farber, Hartless, Kanid, Kindig and Terbies soils are over 40 inches deep. The Beekman, Inskip, Mayacama, Neuns, Sheetiron, Vena and Woodin soils have a lithic contact at 20 to 40 inches. Clallam soils have less than 18 percent clay in the particle-size control section. Straight soils average 10 to 27 percent clay in the particle-size control section, and the coarse fragments are primarily gravel size.
GEOGRAPHIC SETTING: Geppert soils are on mountain slopes at elevations of 1,500 to 4,000 feet. Slopes range from 1 to 70 percent. The soils formed in colluvium weathered from breccia and andesite. The climate is characterized by warm dry summers and cool moist winters. The mean annual temperature is 45 to 52 degrees F. The mean annual precipitation is 30 to 55 inches. The frost-free period is 100 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Freezener and Hukill soils. Freezener and Hukill soils have argillic horizons and are over 40 inches deep.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used for timber production, livestock grazing, water supply and wildlife habitat. Native vegetation is Douglas fir, white fir, ponderosa pine, Pacific madrone, cascade Oregongrape, common snowberry and whipplevine.
DISTRIBUTION AND EXTENT: Southwestern Oregon. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Jackson County Area, Oregon, 1988.
REMARKS:
Classification revised from loamy-skeletal, mixed, mesic Dystric Xerochrepts 6/99
NATIONAL COOPERATIVE SOIL SURVEY
U.S.A.