LOCATION OCTAVIA OK+AREstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, thermic Typic Paleudults
TYPICAL PEDON: Octavia stony fine sandy loam, on a colluvial bench with 28 percent slope, in forest. (Colors are for moist soil unless otherwise stated.)
A--0 to 3 inches; dark grayish brown (10YR 4/2) stony fine sandy loam; weak fine granular structure; friable; sandstone fragments make up 30 percent by volume;
moderately acid; clear wavy boundary. (3 to 7 inches thick)
E--3 to 6 inches; yellowish brown (10YR 5/4) stony fine sandy loam; weak fine granular structure; friable; sandstone fragments make up 30 percent by volume;
strongly acid; clear wavy boundary. (3 to 12 inches thick)
BE--6 to 18 inches; strong brown (7.5YR 5/6) gravelly loam; weak fine granular structure; friable; sandstone fragments make up 20 percent by volume; very
strongly acid; gradual smooth boundary. (5 to 19 inches thick)
Bt1--18 to 30 inches; strong brown (7.5YR 5/6) gravelly clay loam; weak fine subangular blocky structure; friable; sandstone fragments make up 20 percent by
volume; nearly continuous clay films on faces of peds; very strongly acid; gradual smooth boundary. (0 to 18 inches thick)
Bt2--30 to 48 inches; yellowish red (5YR 5/6) gravelly clay loam; many coarse distinct strong brown (7.5YR 5/6) mottles; weak fine subangular blocky structure;
friable; sandstone fragments make up 20 percent by volume; nearly continuous clay films on faces of peds; very strongly acid; gradual wavy boundary. (11 to 40
inches thick)
2Bt3--48 to 65 inches; coarsely mottled red (2.5YR 4/6), strong brown (7.5YR 5/6), and light gray (10YR 7/1) clay; weak fine blocky structure; firm; clay films on
faces of peds; very strongly acid.
TYPE LOCATION: LeFlore County, Oklahoma; about 4 miles south of Muse, Oklahoma; 1,500 feet north and 1,150 feet east of the southwest corner of sec.
27, T. 2 N., R. 24 E.
RANGE IN CHARACTERISTICS: Solum thickness is more than 60 inches.
The A horizon has hue of 10YR, value of 3 or 4, and chroma of 1 to 3. It is loam, fine sandy loam, gravelly loam, gravelly fine sandy loam, cobbly loam, cobbly fine
sandy loam, stony loam, or stony fine sandy loam. Content of coarse fragments of sandstone ranges from 5 to 35 percent by volume. About 5 to 25 percent by
volume is less than 76 mm in diameter and 0 to 25 percent by volume is more than 76 mm in diameter. Reaction is medium acid to very strongly acid unless limed.
The E horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4. Texture, content of coarse fragments, and reaction are the same as the A horizon.
The BE horizon has hue of 7.5YR or 10YR, value of 5 or 6, and
chroma of 4 to 6. Texture and content of coarse fragments are the same as the A1 horizon. Reaction is strongly acid or very
strongly acid.
The Bt horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 4 to 8. Some pedons have mottles in shades of brown. It is clay loam, sandy clay loam,
gravelly clay loam, or gravelly sandy clay loam. Content of coarse fragments of sandstone ranges from 5 to 35 percent by volume. About 5 to 25 percent by volume
is less than 76 mm in diameter and 0 to 10 percent by volume is more than 76 mm in diameter. Reaction is strongly acid or very strongly acid.
The 2Bt horizon has colors the same as the Bt horizon. It is mottled in shades of red, brown, and gray. Some pedons are
coarsely mottled in shades of red, brown, and gray. Texture is clay loam, clay, shaly clay loam, shaly clay, cobbly clay loam, cobbly clay, gravelly clay loam, or
gravelly clay. Content of coarse fragments of shale or sandstone ranges from 5 to 40 percent by volume. About 5 to 30 percent by volume is less than 76 mm in
diameter and 0 to 20 percent by volume is more than 76 mm in diameter. Reaction is strongly acid to extremely acid.
COMPETING SERIES: These are the
Allen,
Avilla,
Dubach,
Etowah,
Holston,
Nella,
Ruston,
Sailes,
Silsbee, and
Warnock series. All of these except Allen,
Nella, and Warnock soils have less than 35 percent clay in their lower sola. Allen, Nella, and Warner soils have moderate permeability and are moist for longer
periods of time. Warnock soils have a Btx horizon at 42 inches.
GEOGRAPHIC SETTING: Octavia soils are on moderately steep to very steep colluvial benches and footslopes in the valley of the Ouachita Mountains and the
Arkansas Valley and Ridges. The upper part of the soil formed in loamy colluvium and the underlying part formed in material weathered from shale of Pennsylvanian
age. Slopes range from 20 to 70 percent. Mean annual precipitation ranges from 40 to 56 inches. Mean annual temperature ranges from 60 degrees to 66 degrees
F. Thornthwaite annual P-E indices are greater than 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Carnasaw,
Caston,
Clebit,
Panama,
Pirum,
Stapp, and
Wilburton series. Carnasaw soils are on
higher sideslopes and have a sola less than 60 inches and have a clayey control section. Caston and Panama soils are on similar areas. Caston soils have more than
35 percent coarse fragments in the control section. Clebit soils are on higher ridge crests and are less than 20 inches to bedrock. Stapp and Pirum soils are on
ridgetops and sideslopes. Stapp soils have more than 35 percent clay in the control section and have sola less than 60 inches thick. Wilburton soils have more than
35 percent rock fragments in the control section, and are on similar and adjacent landscape positions.
DRAINAGE AND PERMEABILITY: Octavia soils are well drained. Runoff is medium to rapid and permeability is moderately slow. A perched water table is
at a depth of 3.5 to 5.0 feet during winter and spring.
USE AND VEGETATION: Used mainly for woodland. The vegetation is primarily white oak, southern red oak, hickory, and shortleaf pine.
DISTRIBUTION AND EXTENT: Ouachita Mountains and the Arkansas Valley and Ridges of Oklahoma and Arkansas. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Latimer County, Oklahoma; 1980.