LOCATION WOODSPOINT OREstablished Series
TAXONOMIC CLASS: Medial, ferrihydritic Typic Fulvicryands
TYPICAL PEDON: Woodspoint medial silt loam - woodland, on a 9 percent southwest-facing slope at 3,380 feet elevation. (Colors are for moist soil unless otherwise stated. When described on August 28, 1995, the soil was dry from the surface to a depth of 16 inches and moist below.)
Oi--0to 1 inch; slightly decomposed twigs, few needles, grass.
A1--1 to 7 inches; dark brown (7.5YR 3/2) medial silt loam, dark yellowish brown (10YR 3/4) dry; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; moderately smeary; many very fine and fine roots; few fine irregular pores; 5 percent gravel and 5 percent diabase paragravel; a discontinuous 0.25 inch layer of white volcanic ash is present about one inch below the soil surface; strongly acid (pH 5.4); clear smooth boundary.
A2--7 to 19 inches; dark brown (7.5YR 3/3) medial silt loam, yellowish brown (10YR 5/4) dry; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; moderately smeary; many very fine and fine roots; few fine irregular pores; 5 percent gravel and 5 percent diabase paragravel; strongly acid (pH 5.2); clear smooth boundary. (Combined thickness of the A horizon is 8 to 20 inches)
Bw1--19 to 29 inches; brown (7.5YR 4/4) medial silt loam, brownish yellow (10YR 6/6) dry; weak fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; moderately smeary; common fine roots; common fine irregular pores; 10 percent gravel and 5 percent diabase paragravel; very strongly acid (pH 4.8); clear smooth boundary.
Bw2--29 to 38 inches; brown (7.5YR 4/4) gravelly medial loam, brownish yellow (10YR 6/6) dry; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; few fine roots; common fine irregular pores; 20 percent gravel, 5 percent cobbles and 5 percent diabase paragravel; very strongly acid (pH 4.8); clear smooth boundary.
Bw3--38 to 49 inches; strong brown (7.5YR 4/6) gravelly medial silt loam, brownish yellow (10YR 6/6) dry; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; common fine irregular pores; 10 percent gravel, 5 percent cobbles and 5 percent diabase paragravel; very strongly acid (pH 4.6); abrupt wavy boundary. (Combined thickness of the Bw horizon is 20 to 52 inches)
R--49 inches; diabase rock
TYPE LOCATION: Tillamook County, Oregon; about 800 feet south and 400 feet west of the northeast corner of section 28, T. 1 N., R. 6 W. (Latitude 45 degrees 32 minutes 52 seconds N. and Longitude 123 degrees 25 minutes 22 seconds W.); Woods Point, OR 7.5 minute USGS topographic quadrangle; NAD 27.
RANGE IN CHARACTERISTICS: These soils are usually moist, and are dry in the soil moisture control section less than 45 consecutive days after the summer solstice. The mean annual soil temperature at a depth of 20 inches is 41 to 45 degrees F. and the mean summer soil temperature is less than 46 degrees F. The particle-size control section averages 10 to 25 percent clay (field estimated), less than 35 percent rock fragments, and 0 to 5 percent pararock fragments. It has a phosphate-retention of greater than 85 percent, acid oxalate extractable aluminum plus one-half iron of 2.0 to 4.0 percent, 2 to 15 cmol(+)/kg KCl extractable aluminum, and 20 to 30 percent 15-bar moisture (air dried sample). Moist bulk density is 0.75 to 0.90 g/cubic centimeter. Depth to bedrock is 40 to 60 inches. The umbric epipedon is 10 to 20 inches thick. Soil reaction is very strongly acid or strongly acid.
The A horizon has value of 2 or 3 moist, 3 to 5 dry and chroma of 2 or 3 moist, 3 or 4 dry. The fine-earth texture is medial silt loam or medial loam and has 10 to 25 percent field estimated clay. It has 0 to 10 percent gravel, 0 to 10 percent cobbles and 0 to 15 percent paragravel.
The Bw horizon has value of 3 or 4 moist, 4 to 6 dry and chroma of 3 to 6 moist, 4 to 8 dry. The fine-earth texture is medial silt loam or medial loam and has 10 to 25 percent field estimated clay. It has 0 to 30 percent gravel, 0 to 25 percent cobbles, 0 to 10 percent stones and 0 to 30 percent paragravel.
COMPETING SERIES: There are no competing series in this family. Similar soils include the Hobit, Mulkey, and Verlot soils. Hobit soils are moderately deep to a paralithic contact and have a xeric soil moisture regime. Mulkey soils are moderately deep to a lithic contact. Hobit and Mulkey soils have umbric epipedons greater than 20 inches thick. Verlot soils are moderately deep to compacted glacial till (Cd horizon) and are moderately well drained.
GEOGRAPHIC SETTING: Woodspoint soils occur in the area along the summit of the Coast Range. The soils are on ridgetops and side slopes of mountains. They are on slopes of 5 to 60 percent. The soils are formed in colluvium and residuum derived from basalt or coarse-grained intrusive igneous rock. Elevations are 2,800 to 4,100 feet. The climate is characterized by cold, wet winters and cool, moist summers. The mean annual precipitation is 120 to 150 inches. The mean annual temperature is 39 to 45 degrees F. The frost free period is 40 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Caterl, Laderly, Murtip, Newanna and Sevencedars soils. Caterl, Laderly, and Murtip soils are on lower side slopes and have frigid soil temperature regimes. Newanna soils are 20 to 40 inches to bedrock. Sevencedars and Newanna soils have a medial-skeletal family particle-size class and are on adjacent side slopes.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: The soils are used for timber production. Potential native vegetation is noble fir, Douglas fir, western hemlock, oval-leaved blueberry.
DISTRIBUTION AND EXTENT: High elevations in the central and northern Coast Range of Oregon; MLRA 1. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benton County, Oregon, 2004. Name is derived from Woodspoint Mountain in Tillamook County, Oregon.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Andic soil properties - from 1 to 49 inches (A1, A2, Bw1, Bw2, Bw3 horizons) based on similar soils.
Umbric epipedon - from 1 to 19 inches (A1, A2, horizons).
Cambic horizon - from 19 to 49 inches (Bw1, Bw2, Bw3 horizons).
Particle-size control section - from 1 to 41 inches
Classification revision 08/97 from medial, Alic Haplocryands to medial, ferrihydritic Typic Fulvicryands.
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.