LOCATION BRANDYPEAK OR
Established Series
Rev. MHF/RWL
06/2011
BRANDYPEAK SERIES
The Brandypeak series consists of moderately deep, well drained soils formed in colluvium and residuum from metasedimentary or metavolcanic rock types. Brandypeak soils are on broad ridgetops and north-facing side slopes of mountains. Slopes are 0 to 90 percent. The mean annual precipitation is about 105 inches and the mean annual temperature is about 43 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Humixerepts
TYPICAL PEDON: Brandypeak very cobbly loam - woodland, on a 35 percent northwest-facing slope at 3,700 feet elevation. (When described on August 19, 1993 the soil was moist to a depth of 10 inches and dry below this depth. Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, twigs and woody materials.
A--1 to 11 inches; dark brown (10YR 3/3) very cobbly loam, brown (10YR 5/3) dry; weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; many fine and very fine irregular pores; 30 percent gravel, 20 percent cobbles, and 5 percent stones; very strongly acid (pH 4.8); clear wavy boundary. (10 to 14 inches thick)
Bw1--11 to 23 inches; brown (10YR 4/3) very cobbly loam, brown (10YR 5/3) dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium, and few coarse roots; common fine tubular pores; 25 percent gravel and 30 percent cobbles; strongly acid (pH 5.2); clear wavy boundary.
Bw2--23 to 35 inches; dark yellowish brown (10YR 4/4) extremely cobbly loam, yellowish brown (10YR 5/4) dry; weak fine and medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few fine and medium roots; common fine tubular pores; 35 percent gravel and 30 percent cobbles; strongly acid (pH 5.2) clear wavy boundary. (The combined thickness of the Bw horizon is 10 to 26 inches)
R--35 inches; highly fractured and partially weathered metasedimentary rock.
TYPE LOCATION: Curry County, Oregon; about 100 feet north and 600 feet west of the southeast corner of section 18, T. 35 S., R. 10 1/2 W. (Latitude 42 degrees, 32 minutes, 31 seconds N.; Longitude 123 degrees, 56 minutes, 11 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 42 to 46 degrees F. The soils are usually moist but are dry in all parts of the moisture control section for 45 to 60 consecutive days between depths of 4 and 12 inches in the four months following the summer solstice. The particle-size control section averages 20 to 30 percent clay and 40 to 85 percent total angular rock fragments. Depth to bedrock is 20 to 40 inches. Solum thickness is 20 to 40 inches. The umbric epipedon is 10 to 14 inches thick and may include the upper part of the Bw horizon. Hue is 10YR or 7.5YR.
The A horizon has value of 2 or 3 moist, 3 to 5 dry and chroma of 2 or 3 moist and dry. It is very cobbly loam with 18 to 25 percent clay. It has 20 to 30 percent gravel, 15 to 20 percent cobbles, and 0 to 5 percent stones.
The Bw horizon has value of 3 to 5 moist, 5 to 7 dry and chroma of 3 to 6 moist and dry. It is very cobbly loam, extremely cobbly loam, or extremely gravelly clay loam with 20 to 30 percent clay. It has 25 to 50 percent gravel, 15 to 30 percent cobbles, and 0 to 5 percent stones. Soil reaction is very strongly acid to strongly acid.
COMPETING SERIES: These are the proposed
Bearcamp,
Freezeout,
Goodwin,
Nanny,
Snowbrier, and
Undusk series. Bearcamp soils are 40 to 60 inches deep to bedrock. Freezeout soils have 10 to 18 percent clay in the particle size control section. Goodwin soils have a paralithic bedrock contact at depths of 40 to 60 inches over granitic rock types. Nanny soils have 10 to 18 percent clay in the particle size control section and are dry for 60 to 80 consecutive days. Snowbrier soils are slightly acid to strongly acid in the upper 10 to 20 inches of the solum and have hue dominated by 2.5Y and 5Y in the cambic horizon. Undusk soils have an umbric epipedon 15 to 20 inches thick, are dominated by ash in the upper 4 to 6 inches of the A horizon, and are greater than 40 inches deep to bedrock.
GEOGRAPHIC SETTING: The Brandypeak soils are on metastable broad ridgetops and active north-facing side slopes of mountains. Slopes are 0 to 90 percent. The soils formed in colluvium and residuum derived from metasedimentary or metavolcanic rock types of the Dothan Formation. Elevations are 3,000 to 5,500 feet. The climate is characterized by cool, wet winters and hot, dry summers. The mean annual precipitation is 90 to 120 inches. The mean annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Althouse,
Jayar,
Skymor,
Woodseye, and the competing
Bearcamp soils. Althouse soils occur on side slopes of mountains, have an ochric epipedon, and are 40 to 60 inches deep to bedrock. Jayar soils occur on side slopes of mountains, have an ochric epipedon, and are 20 to 40 inches deep to bedrock. Skymor and Woodseye soils are on side slopes of mountains and are 10 to 20 inches deep to bedrock. Skymor soils have ochric epipedons. Woodseye soils have umbric epipedons. Bearcamp soils are on ridgetops and north-facing side slopes of mountains, have an umbric epipedon, and are 40 to 60 inches deep to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: The soils are used for timber production, watershed, recreation and wildlife habitat. The native vegetation is white fir, Douglas fir, tanoak, golden chinkapin, sugar pine, Sadler oak, salal, cascade Oregongrape, western rattlesnake plantain, western swordfern, western princes pine, creeping snowberry, deerfoot vanillaleaf, American twinflower, and Pacific serviceberry.
DISTRIBUTION AND EXTENT: Mountainous areas of southwestern Oregon; MLRA 5. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Curry County, Oregon, 1995.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Umbric epipedon - from the surface to a depth of 10 inches (A horizon).
Cambic horizon - from a depth of 10 to 34 inches (Bw1, Bw2 horizons).
Lithic contact - 34 inches
Particle-size control section - from 10 to 34 inches (Bw1, Bw2 horizons).
All depths to diagnostic horizons and features are measured from the top of the mineral horizon.
National Cooperative Soil Survey
U.S.A.