LOCATION HAZELCAMP OREstablished Series
TAXONOMIC CLASS: Fine, mixed, active, mesic Typic Haplohumults
TYPICAL PEDON: Hazelcamp silty clay loam - woodland, on a 25 percent west facing slope at 1,250 feet elevation. (When described on August 29, 1986, the soil profile was moist to a depth of 12 inches and dry below this depth. Colors are for moist soil unless otherwise noted.)
0i--1 inch to 0; partially decomposed needles, leaves, twigs, and woody materials.
A1--0 to 5 inches; dark reddish brown (5YR 3/2) silty clay loam, dark reddish gray (5YR 4/2) dry; strong fine granular structure; hard, firm, sticky and plastic; many fine roots; many fine irregular pores; 10 percent gravel; very strongly acid (pH 5.0); abrupt smooth boundary.
A2--5 to 12 inches; dark reddish brown (5YR 3/3) silty clay loam, reddish brown (5YR 5/3) dry; moderate very fine subangular blocky structure; hard, firm, sticky and plastic; many fine roots; many fine tubular pores; 5 percent gravel; very strongly acid (pH 4.8); clear smooth boundary. (Combined thickness of the A horizon ranges from 10 to 15 inches)
Bt1--12 to 18 inches; reddish brown (5YR 4/3) silty clay loam, reddish brown (5YR 5/3) dry; moderate very fine subangular blocky structure; hard, firm, sticky and plastic; many fine roots; many fine tubular pores; few faint clay films on ped faces; 10 percent gravel and 10 percent soft rock fragments; very strongly acid (pH 4.8); clear smooth boundary.
Bt2--18 to 25 inches; reddish brown (2.5YR 4/4) gravelly silty clay, reddish brown (5YR 5/4) dry; moderate very fine subangular blocky structure; very hard, firm, very sticky and very plastic; common fine roots; many fine tubular pores; common distinct clay films on ped faces; 15 percent gravel and 15 percent soft rock fragments; very strongly acid (pH 4.8) clear smooth boundary.
Bt3--25 to 36 inches; red (2.5YR 4/6) gravelly silty clay, red (2.5YR 5/6) dry; weak very fine subangular blocky structure; very hard, firm, very sticky and very plastic; few fine roots; many fine tubular pores; common distinct clay films on ped faces; 20 percent gravel and 30 percent soft rock fragments; very strongly acid (pH 4.8); abrupt smooth boundary. (Combined thickness of the Bt horizon ranges from 10 to 25 inches)
Cr--36 inches; weathered metavolcanic rock.
TYPE LOCATION: Curry County, Oregon; located about 990 feet west and 2,100 feet north of the southeast corner of section 15, T. 40 S., R. 13 W., W.M.(Latitude 42 degrees, 7 minutes, 13 seconds N.; Longitude 124 degrees, 13 minutes, 26 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 54 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 35 to 45 percent clay and contains 10 to 30 percent rock fragments. The umbric epipedon is 10 to 15 inches thick. The solum is very strongly acid throughout. Depth to a paralithic contact is 20 to 40 inches.
The A horizon has hue of 5YR or 7.5YR, value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. It is silty clay loam with 27 to 35 percent clay. It has 0 to 10 percent gravel and 0 to 20 percent soft rock fragments.
The Bt horizon has hue of 2.5YR or 5YR, value of 4 or 5 moist, 4 to 6 dry and chroma of 4 to 6 moist and dry. It is silty clay loam, gravelly silty clay, or gravelly clay loam with 35 to 45 percent clay. It has 10 to 30 percent gravel and 10 to 50 percent soft rock fragments.
COMPETING SERIES: These are the Absiquil, Apt, McDuff, Peavine, Skookumhouse, and Wintley soils. Absiquil, Apt, McDuff, and Wintley soils have hue yellower than 5YR. Absiquil, Apt, Skookumhouse, and Wintley soils are greater than 40 inches deep to bedrock. Peavine soils average more than 45 percent clay in the particle-size control section and lack rock fragments throughout the solum.
GEOGRAPHIC SETTING: Hazelcamp soils are on broad ridgetops and stable benches of mountains. Slopes are 0 to 30 percent. The soils formed in colluvium and residuum from metasedimentary or metavolcanic rock types of the Dothan Formation. Elevations are 400 to 3,000 feet. The climate is characterized by warm wet winters and hot moist summers. The mean annual precipitation is 90 to 130 inches. The mean annual temperature is 45 to 53 degrees F. The frost-free period is 120 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Averlande, Bravo, Cassiday, Colepoint, Crutchfield, Fritsland, Grouslous, and Skookumhouse soils. Averlande, Bravo, Cassiday, Colepoint, Crutchfield, Fritsland, Grouslous, and Skookumhouse soils occur on broad ridgetops, benches, or side slopes of mountains. Averlande soils are 10 to 20 inches deep to bedrock and loamy-skeletal. Bravo soils are fine-loamy and have an ochric epipedon. Cassiday soils are loamy-skeletal and have an ochric epipedon. Crutchfield soils are fine-loamy. Colepoint and Fritsland soils are 40 to 60 inches deep to bedrock and lack argillic horizons. In addition, Fritsland soils have an ochric epipedon. Grouslous soils are 10 to 20 inches deep to bedrock and are loamy-skeletal. Skookumhouse soils are 40 to 60 inches deep to a paralithic contact.
DRAINAGE AND PERMEABILITY: Well drained; slow permeability.
USE AND VEGETATION: These soils are mainly used for timber production, limited homesites, watershed, recreation, and wildlife habitat. The native vegetation is Douglas fir, tanoak, Pacific madrone, western hemlock, evergreen huckleberry, salal, western swordfern, common beargrass, cascade Oregongrape, western hazel, western brackenfern and evergreen violet.
DISTRIBUTION AND EXTENT: Mountainous areas of southwestern Oregon; MLRA 1. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Curry County, Oregon, 1995. The name is from Hazel Camp Mountain in south central Curry County.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Umbric epipedon - from the surface to a depth of 12 inches (A1, A2 horizons).
Argillic horizon - from a depth of 12 to 36 inches (Bt1, Bt2, Bt3 horizons).
Particle-size control section - from 12 to 32 inches. (Bt1, Bt2, and part of the Bt3 horizons)