LOCATION BURNTWOODS OREstablished Series
TAXONOMIC CLASS: Medial-skeletal over loamy-skeletal, mixed over isotic, frigid Typic Fulvudands
TYPICAL PEDON: Burntwoods extremely gravelly medial loam - woodland, on a 30 percent north-facing slope at 1,940 feet elevation. (Colors are for moist soil unless otherwise noted. When described on September 1, 2000, the soil was moist throughout.)
Oi--0 to 1 inch; slightly decomposed plant material; clear wavy boundary.
Oe--1 to 3 inches; moderately decomposed plant material; abrupt wavy boundary.
A1--3 to 12 inches; very dark grayish brown (10YR 3/2) extremely gravelly medial loam, brown (10YR 4/3) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; moderately smeary; many very fine and fine, and common medium roots; many very fine and fine, and few medium interstitial pores; 10 percent paragravel and 2 percent paracobbles; 50 percent gravel and 15 percent cobbles; very strongly acid (pH 5.0); NaF pH 11.1; clear wavy boundary.
A2--12 to 19 inches; dark brown (10YR 3/3) very gravelly medial loam, brown (10YR 5/3) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; moderately smeary; common very fine, fine, and medium roots; many very fine and fine, and common medium tubular pores; 25 percent paragravel and 2 percent paracobbles; 40 percent gravel and 10 percent cobbles; strongly acid (pH 5.1); NaF pH 11.3; abrupt wavy boundary. (Combined thickness of the A horizon is 15 to 25 inches)
2BA--19 to 27 inches; brown (10YR 4/3) very gravelly loam; yellowish brown (10YR 5/4) dry; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; common very fine, fine, and medium roots; many very fine and fine, and common medium tubular pores; 20 percent paragravel and 5 percent paracobbles; 30 percent gravel and 15 percent cobbles; strongly acid (pH 5.3); NaF pH 10.9 gradual wavy boundary. (0 to 10 inches thick)
2Bw1--27 to 41 inches; yellowish brown (10YR 5/4) very gravelly loam, light yellowish brown (10YR 6/4) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine, and common medium and coarse roots; common fine, and few very fine and medium tubular pores; 20 percent paragravel and 5 percent paracobbles; 30 percent gravel and 15 percent cobbles; strongly acid (pH 5.1); NaF pH 10.8; gradual wavy boundary.
2Bw2--41 to 53 inches; yellowish brown (10YR 5/4) extremely gravelly loam, very pale brown (10YR 8/4) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine, and common medium and coarse roots; common fine, and few very fine and medium tubular pores; 15 percent paragravel and 10 percent paracobbles; 45 percent gravel and 15 percent cobbles; strongly acid (pH 5.3); NaF pH 10.9; gradual wavy boundary.
2Bw3--53 to 67 inches; yellowish brown (10YR 5/4) extremely gravelly loam, very pale brown (10YR 8/4) dry; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and common medium and coarse roots; common fine and medium, and few very fine tubular pores; 10 percent paragravel and 10 percent paracobbles; 45 percent gravel and 20 percent cobbles; strongly acid (pH 5.2); NaF pH 10.8. (Combined thickness of the Bw horizon is 40 to greater than 60 inches thick)
TYPE LOCATION: Benton County, Oregon; about 1.25 miles west of Grass Mountain; located about 2,400 feet north and 1,010 feet east of southwest corner of section 20, T. 13 S, R. 8 W. (Latitude 44 degrees, 25 minutes, 31 seconds N.; Longitude 123 degrees, 41 minutes, 41 seconds W.; Grass Mountain, OR 7.5 minute USGS Quad; NAD 1927)
RANGE IN CHARACTERISTICS:
Soil moisture: Udic moisture regime
Mean annual soil temperature: 43 to 47 degrees F., and the mean summer soil temperature is above 47 degrees F. with an O horizon present.
Solum thickness: 4 to 6 feet
Depth to bedrock: 60 to 80 inches or more to paralithic contact
Bedrock hardness: Paralithic contact ranges from weakly cemented to moderately cemented
Depth to lithologic discontinuity: 15 to 25 inches
Umbric epipedon thickness: 15 to 25 inches thick
Particle-size control section:
Clay content: 20 to 30 percent (by field estimates)
Coarse fragments: 35 to 75 percent rock fragments; 10 to 40 percent pararock fragments
Hue: 10YR or 7.5YR
Soil reaction: Very strongly acid or strongly acid throughout
Other features: The upper 15 to 25 inches of the solum has strongly smeary or moderately smeary consistence (by field estimates) and has andic soil properties
A horizon
Value: 2 or 3 moist, 3 to 5 dry
Chroma: 2 or 3 moist and dry
Texture: GRX-medial L, GRV-medial L
Clay content: 12 to 20 percent
Rock fragments: 35 to 50 percent gravel, 5 to 20 percent cobbles and 0 to 10 percent stones
Pararock fragments: 10 to 30 percent paragravel and 0 to 5 percent paracobbles
Organic matter content: 10 to 20 percent
Andic feature: moist bulk density of 0.70 to 0.90 grams per cubic centimeter (by field estimates), phosphate retention of 85 to 95 percent, acid-oxalate extractable aluminum plus one-half iron of 2.0 to 4.0 percent, KCl-extractable aluminum of 2.0 to 15 cmol/kg, and 15-bar moisture content (air dried) of 15 to 30 percent
2Bw horizon
Value: 3 to 5 moist, 4 to 6 dry
Chroma: 2 to 4 moist and dry
Texture: GRX-L, GRV-L, GRX-CL
Clay content: 20 to 30 percent
Rock fragments: 30 to 50 percent gravel, 10 to 20 percent cobbles and 0 to 10 percent stones
Pararock fragments: 10 to 30 percent paragravel and 5 to 10 percent paracobbles
COMPETING SERIES: These are no competing series.
GEOGRAPHIC SETTING:
Parent material: Recent loamy colluvium overlying older loamy colluvium in ancient landslide deposits derived from sandstone and siltstone of the Tyee and Flournoy Formations
Landform: Mountains
Landform position: Backslopes, footslopes and toeslopes
Slopes: 5 to 60 percent
Elevation: 1,800 to 3,000 feet
Climate: Cool, wet winters; warm, moist summers
Mean annual temperature: 42 to 46 degrees F
Mean annual precipitation: 90 to 130 inches
Frost-free period: 70 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Blodgett,
Chintimini,
Fiverivers,
Grassmountain,
Luckiamute,
Lurnick,
Maryspeak, and
Oldblue soils. Blodgett, Chinitimini, Fiverivers, Grassmountain, and Oldblue soils occur on summits and side slopes of mountains. Luckiamute, Lurnick and Maryspeak soils occur in a cryic temperature regime on adjacent higher mountain slopes.
Blodgett - loamy-skeletal; less than 20 inches deep to Cr over R contact
Chintimini - loamy-skeletal; 40 to 60 inches deep to Cr over R contact
Fiverivers - fine-loamy; 20 to 40 inches deep to a paralithic contact
Grassmountain - fine-loamy; greater than 60 inches deep to a paralithic contact
Luckiamute - loamy-skeletal; less than 20 inches deep to a lithic contact
Lurnick - clayey-skeletal; 20 to 40 inches deep to a paralithic contact
Maryspeak - sandy-skeletal; greater than 80 inches deep
Oldblue - fine-loamy; greater than 60 inches deep to a paralithic bedrock contact; 40 to 80 percent pararock fragments
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: These soils are used for timber production, recreation, wildlife habitat, and watersheds. Potential native vegetation is Douglas fir, western hemlock, Pacific rhododendron, salal, red huckleberry, thimbleberry, salmonberry, trailing blackberry, western swordfern, Pacific trillium, sweetscented bedstraw, and Oregon oxalis. Scattered amounts of noble fir, Pacific silver fir, and tall blue huckleberry occur in some areas at the higher elevations within the frigid zone.
DISTRIBUTION AND EXTENT: Central portion of the Coast Range Mountains of Oregon; MLRA 1. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benton County, Oregon, 2004. The name is taken from the community of Burnt Woods in Lincoln County, Oregon.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Umbric epipedon - from the mineral soil surface to a depth of 19 inches (A1 and A2 horizons).
Cambic horizon - from 19 to 67 inches (BA, Bw1, Bw2, and Bw3 horizons).
Andic soil properties - from the mineral soil surface to 27 inches (A1and A2 horizons).
Particle-size control section - the zone from the mineral soil surface to 43 inches (A1, A2, BA, 2Bw1 and 2 inches of Bw2 horizon). The zone from 3 to 19 inches qualifies as medial-skeletal and the zone from 19 to 43 inches qualifies as loamy-skeletal. This series family classification would be medial-skeletal over loamy-skeletal if this contrasting particle-size class were approved. Below a depth of 19 inches, andic soil properties are absent primarily due to reduced organic matter and higher bulk density.
Depths to diagnostic horizons and features are measured from the top of the first mineral horizon.
Series revision date - Classification revised 08/2002 from medial-skeletal, ferrihydritic, frigid Alic Hapludands to medial-skeletal, mixed, frigid Typic Fulvudands based on laboratory data for the typical pedon.
ADDITIONAL DATA: Characterization data for S01OR003-007, NSSL, Lincoln, NE., 11/01.