LOCATION CAMPFOUR OREstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Pachic Ultic Argixerolls
TYPICAL PEDON: Campfour loam, forested. (Colors are for moist
soil unless otherwise noted.)
O--1 inch to 0; partially decomposed needles and twigs.
A--0 to 5 inches; dark reddish brown (5YR 3/2) loam, reddish
brown (5YR 4/3) dry; strong very fine granular structure;
slightly hard, friable, slightly sticky and slightly plastic;
many very fine and common fine, medium, and coarse roots; many
very fine irregular pores; 9 percent gravel and 5 percent
cobbles; moderately acid (pH 5.8); clear smooth boundary. (2 to
12 inches thick)
AB--5 to 21 inches; dark reddish brown (5YR 3/3) loam,
reddish brown (5YR 4/4) dry; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and common fine, medium, and coarse
roots; many very fine tubular pores; 9 percent gravel and 5
percent cobbles; moderately acid (pH 5.6); clear wavy boundary.
(0 to 16 inches thick)
Bt1--21 to 50 inches; dark reddish brown (5YR 3/3) clay loam,
reddish brown (5YR 4/4) dry; moderate very fine and fine angular blocky structure; hard, firm, sticky and plastic; common very
fine and few fine, medium, and coarse roots; common very fine
tubular pores; common thin clay films on ped faces and in pores;
10 percent gravel; moderately acid (pH 5.6); gradual wavy
boundary. (10 to 30 inches thick)
Bt2--50 to 60 inches; dark reddish brown (5YR 3/4) gravelly
clay loam, reddish brown (5YR 4/4) dry; moderate very fine and
fine angular blocky structure; hard, firm, sticky and plastic;
few very fine, fine, and medium roots; common very fine tubular pores; common thin clay films on ped faces and in pores; 15
percent gravel; moderately acid (pH 5.6).
TYPE LOCATION: Klamath County, Oregon; approximately 800 feet
south and 1,500 feet east of the northwest corner of sec. 1, T.
41 S., R. 5 E., W.M.
RANGE IN CHARACTERISTICS: These soils are usually moist but are
dry in the moisture control section for 80 to 100 consecutive
days in the four months that follow the summer solstice. The
mean annual soil temperature is 47 to 52 degrees F. The mollic epipedon is 20 to 40 inches thick and includes the upper part of
the argillic horizon. Depth to bedrock is greater than 60
inches. The soil has a base saturation of 60 to 90 percent in
the A and AB horizons and 50 to 75 percent throughout the Bt
horizon. The particle-size control section averages 27 to 35
percent clay, 5 to 30 percent gravel, and 0 to 10 percent
cobbles.
The A horizon has hue of 7.5YR, 5YR or 2.5YR, moist and dry,
value of 2 or 3 moist, and chroma of 2 or 3 moist, and 3 or 4
dry. It has 0 to 15 percent gravel and 0 to 5 percent cobbles.
It is moderately acid to slightly acid.
The Bt horizon has hue of 5YR or 2.5YR moist and 7.5YR through
2.5YR dry, and chroma of 3 or 4 moist and dry. It has 27 to 35 percent clay, 5 to 30 percent gravel, and 0 to 10 percent
cobbles. It is clay loam, gravelly clay loam, or cobbly clay
loam. It is strongly acid to slightly acid.
COMPETING SERIES: These are the
Aptos,
Elmore,
Nisene, and
Paragon series. Aptos and Paragon soils are 20 to 40 inches to a paralithic contact. Elmore soils lack an O horizon are dry for
45 to 70 consecutive days and have hue of 10YR and 7.5YR in the
Bt. Nisene soils have a mean annual soil temperature of 56 to 58 degrees F and have hue of 10YR or 7.5YR in the Bt.
GEOGRAPHIC SETTING: Campfour soils are on plateaus and
hillslopes at elevations of 3,000 to 4,400 feet. These soils
formed in residuum and colluvium derived from basalt and andesite with small amounts of volcanic ash in the upper part. The mean annual precipitation is 20 to 25 inches. The mean annual
temperature is 45 to 51 degrees F. The frost-free period is 100
to 130 days. Slopes range from 1 to 35 percent.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
McMullin,
Paragon,
Randcore,
Shoat, and
Skookum soils. McMullin and
Randcore soils are less than 20 inches to bedrock. Paragon and
Shoat soils have bedrock at depths of 20 to 40 inches. Skookum
soils are clayey-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; slow to moderate
runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for timber production
and livestock grazing. Native vegetation includes an overstory
of ponderosa pine and Douglas fir. Also included in varying
amounts are incense cedar, sugar pine, California black oak, and Oregon white oak. Understory includes western fescue, tall
Oregon grape, snowberry, squaw carpet, and Pacific serviceberry.
DISTRIBUTION AND EXTENT: Southwestern Oregon. The series is inextensive.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Jackson County Area, Oregon (klamath County part), 1988.
REMARKS:
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.
ADDITIONAL DATA: Pedon was sampled for; organic carbon, base saturation, particle-size and mineralogy. Sample depths; 0-5,
5-21, 21-30, 30-50 inches.
REMARKS: Diagnostic horizons and features:
- Mollic epipedon - 0 to 30; assume organic carbon is less than
0.6 percent from 30 to 50 inches and color is derived from parent material.
- Assume base saturation of greater than 50 percent throughout profile and less than 75 percent throughout argillic horizon.
- Argillic horizon - 21 to 60 inches.