LOCATION TABLEROCK OREstablished Series
TAXONOMIC CLASS: Clayey-skeletal, smectitic, mesic Pachic Argixerolls
TYPICAL PEDON: Tablerock gravelly loam, woodland. (Colors are
for moist soil unless otherwise noted.)
O--1.5 inch to 0; partially decomposed leaves, twigs, and
moss.
A--0 to 3 inches; very dark brown (10YR 2/2) gravelly loam,
brown (10YR 5/3) dry; strong very fine, fine, and medium granular
and moderate very fine and fine subangular blocky structure;
slightly hard, firm, sticky and plastic; many very fine roots;
common fine and medium irregular pores; 15 percent gravel;
slightly acid (pH 6.1); abrupt smooth boundary. (3 to 8 inches thick)
BAt--3 to 10 inches; very dark grayish brown (10YR 3/2) very
cobbly clay loam, brown (10YR 5/3) dry; moderate very fine and
fine subangular blocky structure; slightly hard, firm, sticky and plastic; common very fine and few fine roots; common very fine
and fine tubular and few fine irregular pores; few thin clay
films on ped faces; 20 percent gravel and 15 percent cobbles; moderately acid (pH 6.0); abrupt smooth boundary. (6 to 10
inches thick)
Bt1--10 to 20 inches; dark brown (10YR 3/3) very cobbly clay
loam, brown (10YR 4/3) dry; strong very fine and fine subangular blocky structure; hard, firm, sticky and very plastic; few very
fine and fine roots; common very fine and fine tubular and fine irregular pores; many moderately thick clay films on ped faces
and in pores; 25 percent gravel and 20 percent cobbles;
moderately acid (pH 5.8); clear smooth boundary. (8 to 12 inches thick)
Bt2--20 to 29 inches; brown (10YR 4/3) very cobbly clay,
brown (10YR 4/3) dry; common fine distinct gray (10YR 5/1)
mottles; moderate medium and coarse angular blocky structure;
very hard, firm, very sticky and very plastic; few very fine,
fine, and medium roots; few very fine tubular pores; many
moderately thick and thick clay films on ped faces and in pores; common slickensides; 20 percent gravel and 15 percent cobbles; moderately acid (pH 5.6); clear wavy boundary. (7 to 11 inches thick)
Bt3--29 to 38 inches; brown (10YR 4/3) very cobbly clay, dark yellowish brown (10YR 4/4) dry; weak medium and coarse angular
blocky structure; very hard, firm, very sticky and very plastic;
few very fine, fine and medium roots; few very fine tubular
pores; many thick clay films on ped faces and in pores; few slickensides; 10 percent gravel, 40 percent cobbles and stones; moderately acid (pH 5.6); clear wavy boundary. (0 to 11 inches thick)
Bt4--38 to 49 inches; dark yellowish brown (10YR 4/4)
gravelly clay loam, pale brown (10YR 6/3) dry; weak fine and
medium subangular blocky structure; slightly hard, very firm,
sticky and very plastic; few fine and medium roots; few very fine tubular pores; many thin clay films on ped faces and common moderately thick clay films on ped faces and in pores; common
small black stains; 20 percent gravel and 10 percent cobbles; strongly acid (pH 5.5); gradual wavy boundary. (10 to 13 inches thick)
BCt--49 to 65 inches; dark yellowish brown (10YR 4/4)
gravelly loam, very pale brown (10YR 7/3) dry; massive; slightly hard, very firm, slightly sticky and plastic; few fine and medium roots; many moderately thick and thin clay films on ped faces;
common small black stains; 20 percent gravel and 10 percent
cobbles; moderately acid (pH 5.7); gradual wavy boundary. (0 to
18 inches thick)
2Cr--65 inches; weathered sandstone.
TYPE LOCATION: Jackson County, Oregon; approximately 2,400 feet
west and 200 feet north of the southeast corner of sec. 4, T. 36
S., R 2 W. W.M.
RANGE IN CHARACTERISTIC: These soils are usually moist but are
dry in the moisture control section for 80 to 110 consecutive
days during the period of four months following the summer
solstice. The mean annual soil temperature ranges from 47 to 54 degrees F. Depth to weathered bedrock is over 60 inches. The particle-size control section averages 40 to 60 percent clay with
35 to 60 percent rock fragments, primarily cobble-size. The
mollic epipedon is 20 to 30 inches thick.
The A horizon has hue of 10YR, 7.5YR, and 2.5Y, value of 2 or 3
moist and 3 through 5 dry, and chroma of 2 or 3 moist and dry.
It has 15 to 20 percent gravel and 0 to 5 percent cobbles. It is slightly acid or neutral.
The Bt2 and Bt3 horizons have hue of 10YR, 7.5YR, and 2.5Y, value
of 3 or 4 moist and 3 through 6 dry, and chroma of 2 through 6
moist and dry. It has 10 to 30 percent gravel and 15 to 40
percent cobbles and stones. It is moderately acid or slightly
acid.
The lower part of the Bt horizon and the BCt horizon has hue of
10YR and 2.5Y, and value of 4 or 5 moist and 6 through 8 dry and chroma of 3 or 4 moist and dry. It has 15 to 25 percent gravel
and 5 to 20 percent cobbles and stones. It is gravelly loam, gravelly clay loam or very cobbly clay loam.
COMPETING SERIES: These are the Gurdane, Mallory and Thiessen series. All of the above series are 20 to 40 inches to a lithic contact.
GEOGRAPHIC SETTING: Tablerock soils are on side slopes and upper footslopes at elevations of 1,250 to 3,600 feet. These soils
formed in colluvium weathered from basalt, andesite, and
sandstone. The mean annual precipitation is 18 to 30 inches.
The mean annual temperature is 45 to 52 degrees F. The
frost-free period is 120 to 180 days. Slopes range from 20 to 50 percent.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the
Carney soil. The Carney soils are 20 to 40 inches deep and have less than 35
percent rock fragments in the control section.
DRAINAGE AND PERMEABILITY: Moderately well drained; medium to
rapid runoff; very slow permeability.
USE AND VEGETATION: These soils are used for livestock grazing, recreation, and wildlife. Native vegetation includes an
overstory of Oregon white oak, California black oak, Pacific
madrone, birchleaf mountainmahogany, ponderosa pine, Douglas fir,
and sugar pine. Understory includes poison oak, wedgeleaf
ceanothus, bedstraw, and fescue.
DISTRIBUTION AND EXTENT: Southwestern Oregon. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Jackson County Area, Oregon, 1988.
REMARKS: Diagnostic horizons and features:
- Mollic epipedon - 0 to 20 inches.
- Argillic horizon - 10 to 38 inches.
- Assume a base saturation of greater than 75 percent throughout
from 0 to 38 inches.
ADDITIONAL DATA: This pedon was referenced sampled for organic carbon and base saturation.