LOCATION ATRING OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Typic Dystroxerepts
TYPICAL PEDON: Atring gravelly loam, woodland. (Colors are for moist soil unless otherwise noted.)
Oi--2 inches to 0; Douglas fir needles, cones, bark, and lichen.
A--0 to 9 inches; dark grayish brown (10YR 4/2) gravelly loam, light gray (10YR 7/2) dry; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine irregular pores; 20 percent gravel; slightly acid (pH 6.4); clear wavy boundary. (6 to 12 inches thick)
Bw--9 to 20 inches; brown (10YR 4/3) very gravelly loam, very pale brown (10YR 7/3) dry; weak fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine to medium roots; common very fine to medium tubular pores; 50 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (9 to 33 inches thick)
BC--20 to 35 inches; yellowish brown (10YR 5/6) very gravelly loam, very pale brown (10YR 7/4) dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine to medium roots; common very fine to medium tubular pores; 50 percent coarse gravel and cobbles; moderately acid (pH 6.0); clear wavy boundary. (0 to 18 inches thick)
Cr--35 inches; fractured and weathered sandstone.
TYPE LOCATION: Douglas County, Oregon; about 4 miles north of the community of Umpqua on BLM road 19.1; 2,000 feet east and 1,800 feet north of the SW corner of sec. 1, T. 25 S., R. 7 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature typically is 52 to 57 degrees F. but may range to 49 degrees F. (minimum). The solum has 35 to 60 percent rock fragments. Depth to bedrock is 20 to 40 inches. The soil is dry for 45 to 60 consecutive days after the summer solstice at depths of 4 to 12 inches. Hue is 10YR or 7.5YR.
The A horizon has value of 2 to 5 moist, 4 to 7 dry, and chroma of 2 to 4 moist and dry. It is gravelly loam, very gravelly loam, or gravelly silt loam with 15 to 25 percent clay. It has 15 to 55 percent gravel and 0 to 10 percent cobbles.
The Bw horizon has value of 3 to 5 moist, 5 to 7 dry, and chroma of 3 to 6 moist and dry. It is very gravelly loam, very gravelly clay loam, or very gravelly silt loam with 15 to 30 percent clay. It has 35 to 60 percent gravel and 10 to 20 percent cobbles. Soil reaction is strongly acid to slightly acid.
A C horizon, when present, has partially weathered fragments of sandstone with material that ranges from loam to sandy loam in texture.
COMPETING SERIES: These are the Baldhill, Barpeak, Beekman, Chamate(T), Clallam, Farber, Geppert, Hartless, Inskip, Kanid, Kindig, Mayacama, Neuns, Sheetiron, Straight, Terbies, Vena and Woodin series. Baldhill, Barpeak, Chamate, Farber, Hartless, Kanid, Kindig, and Terbies soils are all deeper than 40 inches to bedrock. Beekman, Inskip, Mayacama, Neuns, Sheetiron, Vena and Woodin soils have a lithic contact at depths of 20 to 40 inches. Clallam soils have a mottled B horizon. Straight soils have hue of 5YR and 2.5YR. Geppert soils are dry for 60 to 90 consecutive days.
GEOGRAPHIC SETTING: Atring soils are on ridges and side slopes of mountains. Slopes are 12 to 90 percent. Elevations range from 400 to 4,100 feet. The soils formed in colluvium and residuum from sandstone and siltstone in the Coast Range and from metasedimentary rocks in the Klamath Mountains. The climate is characterized by cool moist to wet winters and warm to hot dry summers. The mean annual precipitation is typically 30 to 60 inches but in areas of high winter rainfall may range to 100 inches. The mean January temperature is 39 degrees F, mean July temperature is 66 degrees F, and mean annual temperature is 47 to 55 degrees F. The frost-free period is 100 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Acker, Bateman, Bellpine, Dumont, Jory, Kanid, Oakland, Norling, and Vermisa soils. Bateman, Bellpine, Dumont, Jory, and Oakland soils are fine textured and have an argillic horizon. Acker soils are fine-loamy and deeper than 40 inches to bedrock. Vermisa soils have a lithic contact within a depth of 20 inches. Norling soils are fine-loamy.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: Timber production, some grazing, wildlife, habitat, and watershed. Natural vegetation is Douglas fir and western hemlock with Pacific madrone, Oregon white oak, hazel, poison oak, and grasses. In high rainfall areas of Curry County, Oregon, natural vegetation includes Douglas fir, tanoak, Pacific madrone, canyon live oak, and sugar pine.
DISTRIBUTION AND EXTENT: Eastern side of the Coast Range and northern part of the Klamath Mountains, Oregon; MLRA 5. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Lane County Area, Oregon, 1981.
REMARKS: Diagnostic horizons and features include:
Ochric epipedon
Cambic horizon - the zone from 9 to 20 inches (Bw horizon)
Dystric feature - the zone from 10 to 30 inches (Bw and upper part of BC horizon) having assumed base saturation by (NH4OAC) of less than 60 percent.
In the mountains of interior Curry County, Oregon the mean annual precipitation ranges up to 100 inches due to elevated winter rainfall; summer periods are hot and dry.
Classification revised from loamy-skeletal, mixed, mesic Dystric Xerochrepts 6/99