LOCATION WINTLEY OREstablished Series
TAXONOMIC CLASS: Fine, isotic, mesic Typic Haplohumults
TYPICAL PEDON: Wintley silt loam, on a east-facing slope of 15 percent at 175 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; undecomposed leaves, needles, and twigs.
A--1 to 5 inches; dark brown (7.5YR 3/4) silt loam, brown (7.5YR 5/4) dry; moderate very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many fine irregular pores; very strongly acid; clear wavy boundary. (4 to 7 inches thick)
BA--5 to 17 inches; dark brown (7.5YR 4/4) silty clay loam, light brown (7.5YR 6/4) dry; moderate medium subangular blocky structure; hard, friable, sticky and plastic; common very fine and fine roots; common fine irregular pores; 5 percent gravel; very strongly acid; clear wavy boundary. (5 to 15 inches thick)
Bt1--17 to 32 inches; strong brown (7.5YR 4/6) silty clay, reddish yellow (7.5YR 6/6) dry; moderate medium subangular blocky structure; hard, friable, sticky and plastic; common very fine and fine and common medium and coarse roots; common fine irregular and few medium tubular pores; common distinct clay films on faces of peds and in pores; 10 percent gravel; very strongly acid; clear wavy boundary. (13 to 25 inches thick)
Bt2--32 to 48 inches; strong brown (7.5YR 4/6) silty clay loam, reddish yellow (7.5YR 6/6) dry; moderate medium subangular blocky structure; hard, friable, sticky and plastic; few very fine and fine roots; many medium irregular and tubular pores; common distinct clay films on faces of peds; 15 percent gravel; very strongly acid; clear smooth boundary. (10 to 25 inches thick)
2C--48 to 60 inches; dark yellowish brown (10YR 4/6) very gravelly loam, brownish yellow (10YR 6/6) dry; massive; soft, nonsticky and nonplastic; few fine irregular pores; 50 percent gravel; very strongly acid.
TYPE LOCATION: Coos County, Oregon; one-half mile southwest of Myrtle Point; 600 feet north and 100 feet west of the SE corner section 18, T. 29 S., R. 12 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 51 to 55 degrees F. The soil is dry for less than 45 consecutive days between 4 and 12 inches during the summer. Solum thickness is 40 to 60 inches. Depth to stratified gravelly 2C horizon is 40 to over 60 inches. Gravel content is 0 to 15 percent in the solum. The soil is strongly acid or very strongly acid. Hue is 10YR or 7.5YR.
The A horizon has value of 3 or 4 moist, 4 or 5 dry, and chroma of 3 or 4 moist and dry.
The BA horizon has value of 3 or 4 moist, 4 to 6 dry, and chroma of 4 to 6 moist and dry.
The Bt horizon has value of 4 or 5 moist, 4 to 6 dry, and chroma of 4 to 6 moist and dry. It is silty clay loam, silty clay, or clay and has 35 to 50 percent clay.
The 2C horizon is very gravelly loam, gravelly loam, or very gravelly sandy loam with 10 to 20 percent clay. It has 25 to 60 percent rock fragments. Faint mottles are in some pedons.
COMPETING SERIES: These are the Absaquil, Apt, Hazelcamp, McDuff, Peavine and Skookumhouse series. All of these soils occur on ridgetops, benches, and side slopes of mountains. Absaquil soils are 40 to 60 inches deep to a paralithic contact. Apt soils have 50 to 60 percent clay in the argillic horizon and lack a very gravelly 2C horizon. Hazelcamp, McDuff, and Peavine soils are moderately deep to a paralithic contact. Skookumhouse soils are 40 to 60 inches deep to bedrock and lack a very gravelly 2C horizon.
GEOGRAPHIC SETTING: Wintley soils are on high stream terraces. Slopes dominantly are 8 to 15 percent but range from 0 to 30 percent on terrace fronts and along drainageways. The soils formed in mixed alluvium. Elevation is 50 to 800 feet. The climate is characterized by warm wet winters and hot moist summers. The mean annual precipitation is 60 to 100 inches. The mean annual temperature is 50 to 53 degrees F. The frost-free period is 160 to 240 days. The soils are on the Pioneer geomorphic surface.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chismore, Eilertsen, Pyburn, Zyzzug and the competing McCurdy soils. Chismore soils are moderately well drained. Pyburn and Zyzzug soils are poorly drained. Eilertsen soils are fine-silty and are on low stream terraces of the Tenmile geomorphic surface.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: Wintley soils are used mainly for pasture and homesites. Some areas are used for timber production and wildlife habitat. The native vegetation is Douglas fir, western hemlock, grand fir, western redcedar, Port-Orford-cedar, red alder, California laurel, tanoak, bigleaf maple, Pacific rhododendron, salal, western swordfern, evergreen huckleberry, trailing blackberry, and Oregon oxalis.
DISTRIBUTION AND EXTENT: Along streams in the interior valleys of western Oregon; MLRA 1. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Coos County, Oregon, 1983.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
ochric epipedon
argillic horizon - from 17 to 32 inches (Bt1 and Bt2 horizons).
Humults feature - more than 0.9 percent organic carbon in the argillic horizon.
All diagnostic horizons and features are measured from the to of the first mineral horizon.