LOCATION YOREL OREstablished Series
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Typic Dystrudepts
TYPICAL PEDON: Yorel gravelly loam-woodland, on a 10 percent south-facing slope at an elevation of 3,250 feet. (When described on June 28, 1985, the soil profile was moist throughout. Colors are for moist soil unless otherwise noted.)
0i--2 inches to 0; partially decomposed needles, leaves, twigs, and woody material.
A1--0 to 3 inches; dark brown (7.5YR 3/3) gravelly loam, brown (7.5YR 5/4) dry; strong very fine granular structure; soft, friable, nonsticky and slightly plastic; many fine roots; many fine irregular pores; 15 percent gravel; very strongly acid (pH 5.0); abrupt smooth boundary.
A2--3 to 6 inches; dark brown (7.5YR 4/4) gravelly loam, brown (7.5YR 5/4) dry; strong very fine granular structure; slightly hard, friable, nonsticky and slightly plastic; many fine roots; many fine irregular pores; 15 percent gravel; very strongly acid (pH 4.8); clear smooth boundary. (Combined thickness of the A horizon is 5 to 8 inches.)
Bw1--6 to 12 inches; dark brown (7.5YR 4/4) gravelly loam, light brown (7.5YR 6/4) dry; strong very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many fine tubular pores; 20 percent gravel; very strongly acid (pH 4.8); clear smooth boundary.
Bw2--12 to 23 inches; strong brown (7.5YR 4/6) gravelly clay loam, reddish yellow (7.5YR 6/6) dry; moderate fine subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common fine roots; many fine tubular pores; 20 percent gravel and 10 percent soft rock fragments; very strongly acid (pH 4.8); clear smooth boundary.
Bw3--23 to 31 inches; strong brown (7.5YR 5/6) gravelly clay loam, reddish yellow (7.5YR 6/6) dry; weak fine subangular blocky structure; hard, firm, sticky and plastic; common fine roots; many very fine tubular pores; 30 percent gravel and 20 percent soft rock fragments; very strongly acid (pH 4.6); abrupt smooth boundary. (Combined thickness of the Bw horizon ranges from 15 to 32 inches)
R--31 inches; fractured sandstone.
TYPE LOCATION: Curry County, Oregon; located about 1,900 feet south and 500 feet east of the northwest corner of section 11, T. 37 S., R. 13 W., W. M. (Latitude 42 degrees, 23 minutes, 28 seconds N.; Longitude 124 degrees, 13 minutes, 17 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 41 to 46 degrees F. The soils are usually moist and are dry for less than 45 consecutive days in all parts between depths of 4 and 12 inches in the four months following the summer solstice. The particle-size control section averages 25 to 35 percent clay and 15 to 30 percent rock fragments. Depth to bedrock and solum thickness is 20 to 40 inches. Hue is 7.5YR or 10YR.
The A horizon has value of 3 or 4 moist, 5 or 6 dry and chroma of 2 through 4 moist and 4 to 6 dry. It is gravelly loam with 18 to 25 percent clay. It has 15 to 25 percent gravel.
The Bw horizon has value of 4 or 5 moist, 5 or 6 dry and chroma of 4 to 6 moist and dry. It is gravelly loam or gravelly clay loam with 25 to 35 percent clay. It has 15 to 35 percent gravel and 10 to 30 percent soft rock fragments.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Yorel soils are on metastable broad ridgetops and side slopes of mountains. Slopes are 0 to 60 percent. The soils formed in colluvium and residuum from metasedimentary or metavolcanic rock types of the Dothan Formation. Elevations are 2500 to 3800 feet. The climate is characterized by cool wet winters and warm moist summers. The mean annual precipitation is 130 to 160 inches. The mean annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bobsgarden, Pyrady, Euchrand, Rilea, Stackyards, and Zalea soils. Bobsgarden, Pyrady, Rilea, and Zalea soils occur on broad ridgetops and side slopes of mountains. Bobsgarden soils are loamy-skeletal and greater than 60 inches deep to bedrock. Pyrady soils have argillic horizons, are greater than 60 inches deep to bedrock, and are moderately well drained. Euchrand soils occur on side slopes of mountains, are loamy-skeletal, and are 10 to 20 inches deep to bedrock. Rilea soils are loamy-skeletal. Stackyards soils occur on north-facing side slopes of mountains, are 40 to 60 inches deep to bedrock, and are loamy-skeletal. Zalea soils have argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: These soils are used mainly for timber production, watershed, recreation, and wildlife habitat. The native vegetation is Douglas fir, tanoak, western hemlock, golden chinkapin, Port-Orford cedar, Pacific madrone, salal, cascade Oregongrape, common beargrass, western swordfern, Pacific rhododendron, coast fairybells, western brackenfern, red huckleberry, and western rattlesnake plantain.
DISTRIBUTION AND EXTENT: Mountainous areas of southwestern Oregon; MLRA 1. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Coos County, Oregon, 1983. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Ochric epipedon
Cambic horizon-from a depth of 6 to 31 inches (Bw1, Bw2, Bw3 horizons).
Particle-size control section - from 10 to 31 inches (lower part of Bw1, the Bw2 and Bw3 horizons).