LOCATION WOLFER OREstablished Series
TAXONOMIC CLASS: Medial over sandy or sandy-skeletal, ferrihydritic over mixed, isomesic Typic Fulvudands
TYPICAL PEDON: Wolfer medial silt loam, pasture. (Colors are for moist soil unless otherwise noted.)
A1--0 to 9 inches; very dark brown (10YR 2/2) medial silt loam, dark grayish brown (10YR 4/2); moderate very fine granular structure; soft, very friable, slightly sticky and slightly plastic; weakly smeary; many very fine irregular pores; many very fine roots; 10 percent rounded gravel; very strongly acid (pH 4.8); clear smooth boundary. (6 to 10 inches thick)
A2--9 to 19 inches; very dark brown (10YR 2/2) medial gravelly silt loam, dark grayish brown (10YR 4/2) dry; moderate very fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; weakly smeary; many very fine irregular pores; many very fine roots; 15 percent rounded gravel and 5 percent rounded cobbles; very strongly acid (pH 4.8); clear wavy boundary. (6 to 10 inches thick)
Bw--19 to 29 inches; dark brown (7.5YR 3/4) medial very gravelly loam, pale brown (10YR 6/3) dry; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many fine continuous tubular pores; common very fine roots; 30 percent rounded gravel and 10 percent rounded cobbles; very strongly acid (pH 5.0); clear wavy boundary. (10 to 20 inches thick)
2C1--29 to 38 inches; variegated brown (7.5YR 4/4) strong brown (7.5YR 5/6) dark brown (10YR 3/3) and yellowish brown (10YR 5/4) extremely gravelly loamy sand; brown (10YR 5/3) and light yellowish brown (10YR 6/4) dry; single grain; loose, nonsticky and nonplastic; many fine and very fine irregular pores; 60 percent rounded gravel and 10 percent rounded cobbles; strongly acid (pH 5.2); gradual wavy boundary. (7 to 15 inches thick)
2C2--38 to 60 inches; variegated dark brown (10YR 3/3) and yellowish brown (10YR 5/4) extremely gravelly loamy coarse sand; pale brown (10YR 6/3) and light yellowish brown (10YR 6/4) dry; single grain; loose, nonsticky and nonplastic; many fine and very fine irregular pores; 65 percent rounded gravel and 5 percent rounded cobbles; strongly acid (pH 5.4).
TYPE LOCATION: Lincoln County, Oregon, in pasture just east of paved road in the SW1/4 SW1/4 section 20, T. 9 S., R. 9 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is about 49 to 53 degrees F. The difference between mean summer and mean winter soil temperature is 5 to 9 degrees F. under a closed canopy. The soil is usually moist and is dry for less than 45 consecutive days following the summer solstice. The solum has an estimated P-retention of 95 to 100 percent, acid oxalate extractable aluminum plus one-half iron of 3.0 to 5.0 percent, and 15-bar moisture (dried) of 20 to 35 percent. Depth to bedrock is over 60 inches. Depth to the 2C horizon is 24 to 36 inches. The umbric epipedon is 12 to 20 inches thick. Soil reaction is very strongly or strongly acid throughout.
The A horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist and 4 or 5 dry, and chroma of 1 or 2 moist and dry. It is weakly to moderately smeary. It has 5 to 15 percent gravel and 0 to 5 percent cobbles. The moist bulk density is 0.50 to 0.80 grams per cubic centimeter. It has 10 to 15 percent organic matter.
The Bw horizon has hue of 7.5YR or 10YR, value of 3 or 4 moist, 5 or 6 dry and chroma of 3 or 4 moist and dry. Texture is medial loam or medial sandy loam with an estimated clay content of 5 to 15 percent. It has 15 to 35 percent rounded gravel and 0 to 15 percent rounded cobbles. The moist bulk density is 0.75 to 0.85 grams per cubic centimeter.
The 2C horizon has hue of 7.5YR or 10YR, value of 3 to 5 moist and dry and chroma of 3 or 4 moist and dry. Texture is sand, loamy sand, loamy coarse sand, or coarse sand with 50 to 60 percent rounded gravel and 0 to 15 percent rounded cobbles. Stratification is common.
COMPETING SERIES: This is the Donkeycreek series. Donkeycreek soils are 14 to 20 inches to glacial outwash sand and gravel (2C horizon) and have either an umbric or ochric epipedon.
GEOGRAPHIC SETTING: Wolfer soils are on stream terraces of Senecal (Whiskey Run) age at elevations of 100 to 300 feet. Slopes are 0 to 3 percent. They formed in silty over sandy and gravelly alluvium of predominantly igneous origin. The climate is characterized by cool wet winters and cool moist summers. The mean annual precipitation is 70 to 100 inches. The mean January temperature is about 40 degrees F. and the mean July temperature is about 63 degrees F. The mean annual temperature is 49 to 52 degrees F. The frost-free period is 160 to 260 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Quillamook and Siletz series. Quillamook soils are medial. Siletz soils are medial over loamy. These soils are on marine terraces.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; permeability of the solum is moderate and permeability of the substratum is rapid.
USE AND VEGETATION: These soils are used dominantly for pasture, cropland and wildlife. Native vegetation is Douglas fir, western hemlock, Sitka spruce, bigleaf maple, salmonberry, trailing blackberry, brackenfern, snowberry, cascara and other shrubs.
DISTRIBUTION AND EXTENT: Senecal (Whiskey Run) terraces in the central and northern Coast Range in Oregon; MLRA 4a. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lincoln County, Oregon, 1990.
REMARKS: Diagnostic horizons and features in this pedon are:
Umbric epipedon - from 0 to 19 inches (A1 and A2 horizons).
Cambic horizon - from 19 to 29 inches (Bw horizon).
Andic properties - from 0 to 29 inches (A1, A2, and Bw horizons).
Particle-size control section - from the surface to 40 inches (A1, A2, Bw, 2C1, and upper 2C2 horizons) with the zone from 0 to 19 inches qualifying as medial; the zone from 19 to 29 inches qualifying as medial-skeletal; and the contrasting zone from 29 to 40 inches qualifying as sandy-skeletal. The contrasting family is based on a weighted average of the zone from 0 to 29 inches (medial) and the contrasting zone from 29 to 40 inches (sandy or sandy-skeletal).
Reclassified on 11/04 from Typic Melanudands to Typic Fulvudands. Reclassification based on the epipedon value and chroma, moist, overlapping Melanudands and Fulvudands color criteria and an estimated melanic index of 1.75 to 2.0 based on data collected from associated soils.