LOCATION FAWCETER OREstablished Series
TAXONOMIC CLASS: Medial-skeletal, ferrihydritic, isofrigid Pachic Fulvudands
TYPICAL PEDON: Fawceter gravelly medial silt loam, woodland, on a 74 percent northwest-facing slope at an elevation of 2,050 feet. (Colors are for moist soil unless otherwise noted. When described on May 24, 1994, the soil was moist throughout.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, twigs, roots and moss.
A1--1 to 11 inches; very dark brown (10YR 2/2) gravelly medial silt loam, very dark brown (10YR 2/2) dry; weak very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; strongly smeary; many very fine, fine and common medium and coarse roots; many very fine and few fine irregular pores; 20 percent gravel and 10 percent cobbles; strongly acid (pH 5.2); clear smooth boundary.
A2--11 to 29 inches; very dark brown (10YR 2/2) very cobbly medial silt loam, very dark grayish brown (10YR 3/2) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; moderately smeary; many very fine and common fine, medium and coarse roots; many very fine and few fine irregular pores; 25 percent gravel and 15 percent cobbles; very strongly acid (pH 4.8); gradual smooth boundary. (Combined thickness of the A horizon ranges from 15 to 36 inches.)
Bw1--29 to 41 inches; dark brown (10YR 3/3) very cobbly medial loam, dark brown (10YR 3/3) dry; weak very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; moderately smeary; common very fine and fine and few medium roots; common very fine irregular and few fine tubular pores; 30 percent gravel and 15 percent cobbles; very strongly acid (pH 5.0); clear smooth boundary.
Bw2--41 to 57 inches; dark yellowish brown (10YR 3/4) extremely gravelly medial loam, dark yellowish brown (10YR 4/4) dry; weak very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; moderately smeary; common fine and medium roots; common very fine irregular pores; 45 percent gravel and 20 percent cobbles; very strongly acid (pH 5.0); abrupt wavy boundary. (Combined thickness of the Bw horizon is 15 to 42 inches.)
R--57 inches; fractured dark brown hard volcanic rock.
TYPE LOCATION: Tillamook County, Oregon; located about 6 miles northeast of Tillamook, Oregon; about 50 feet north and 1,000 feet west of the southeast corner of section 35, T.1 N., R. 9W; USGS Cedar Butte topographic quadrangle; lat. 45 degrees 31 minutes 16 seconds N. and long. 123 degrees 44 minutes 48 seconds W.
RANGE IN CHARACTERISTICS: The soils are usually moist, and are dry for less than 45 consecutive days in all parts between the depth of 4 and 12 inches in the four months following the summer solstice. The mean annual soil temperature is 43 to 46 degrees F. The difference between the mean summer and mean winter soil temperature is less than 9 degrees F. The depth to bedrock is 40 to 60 inches. The umbric epipedon is 20 to 40 inches thick. The particle size control section averages 35 to 70 percent rock fragments, 2 to 4 percent acid oxalate aluminum plus one-half iron, and 90 to 100 percent P-retention. Moist bulk density is 0.75 to 0.90 g/cm3. The hue is 10YR or 7.5YR throughout.
The A1 horizon has value of 2 or 3 moist, 2 to 4 dry and has chroma of 2 or 3 moist, 2 to 4 dry. It has 15 to 30 percent gravel and 0 to 10 percent cobbles.
The A2 horizon has value of 2 or 3 moist, 2 to 4 dry and has chroma of 2 or 3 moist, 2 to 4 dry. It is medial loam or medial silt loam and has 20 to 55 percent gravel and 0 to 25 percent cobbles.
The Bw horizon has value of 3 or 4 moist, 3 to 5 dry and has chroma of 3 or 4 moist, 3 to 6 dry. It is medial loam or medial silt loam and has 20 to 60 percent gravel, 0 to 50 percent cobbles, and 0 to 15 percent stones.
COMPETING SERIES: These are the Elklake, Flatbottom, Killam, McKinnon, Urboden, and Zenobia. Elklake, Flatbottom, Killam and Zenobia soils are 20 to 40 inches to bedrock. Larsen creek soils are usually moist and have a perudic soil moisture regime. McKinnon soils have an umbric epipedon 10 to 20 inches thick. Urboden soils are more than 60 inches to bedrock and are usually moist with a perudic soil moisture regime.
GEOGRAPHIC SETTING: The Fawceter soils are on ridgetops and side slopes of mountains. Slopes are 5 to 90 percent. Elevations are 1,600 to 3,000 feet. The climate is characterized by cold, wet winters and cool, moist summers. The average annual precipitation is 100 to 120 inches. The average annual temperature is 43 to 46 degrees F. The frost-free period is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Killam soils and the Mosscreek soils. Killam soils are on mountains and are medial-skeletal, and 20 to 40 inches to bedrock. Mosscreek soils are on mountains and are medial and 60 inches or more to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; runoff is rapid on moderately steep and steep slopes, and is very rapid on very steep slopes; permeability is moderate.
USE AND VEGETATION: These soils are used for timber production, recreation, wildlife habitat and water supply. Native vegetation includes western hemlock, Sitka spruce, noble fir, Douglas fir, red alder, western red cedar, western swordfern, salmonberry, red huckleberry and tall blue huckleberry, salal, oxalis and false-lily-of-the-valley.
DISTRIBUTION AND EXTENT: High elevations along coastal mountains of northwest Oregon, Coast Range mountains; MLRA 4A. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clatsop County, Oregon, 2006.
REMARKS: This draft reflects a change in classification by adding ferrihydritic mineralogy.
Diagnostic horizons and features recognized in this pedon include:
Umbric epipedon - from 1 to 41 inches (A1, A2, and Bw1 horizons).
Cambic horizon - from 41 to 57 inches (Bw2 horizon).
Andic soil properties - from 1 to 57 inches (A1, A2, Bw1, and Bw2 horizons).
Particle-size control section - from 1 to 41 inches (A1, A2, and Bw1 horizons).
Medial-skeletal - Averages 35 percent or more rock fragments in the particle-size control section.
The series was established in 2006. The series was added to the Clatsop County soil survey legend prior to the final correlation for Tillamook County in order to have an exact join with Tillamook County soil survey.