LOCATION NASHOBA OKEstablished Series
The Nashoba series consists of moderately deep, well drained, moderately rapid permeable soils that formed in material weathered from sandstone of Pennsylvanian age. These soils are on nearly level to steep sideslopes and ridges of the Ouachita Mountains, MLRA 119. Water runs off the surface at a low to rapid rate, depending on slope. Slopes range from 1 to 35 percent.
TAXONOMIC CLASS: Loamy-skeletal, siliceous, semiactive, thermic Typic Dystrudepts
TYPICAL PEDON: Nashoba stony sandy loam, in forest. (Colors are for moist soil unless otherwise stated.)
A--0 to 4 inches; grayish brown (10YR 5/2) stony sandy loam; weak medium granular structure; hard, very friable; many roots of all sizes; 10 percent stones by volume and 15 percent flat fragments of sandstone by volume; moderately acid; clear smooth boundary. (3 to 6 inches thick)
Bw--4 to 30 inches; brown (10YR 5/3) very stony sandy loam; weak medium granular structure; hard, friable; many roots of all sizes; 15 percent stones by volume and 35 percent flat fragments of sandstone by volume; strongly acid; abrupt irregular boundary. (17 to 30 inches thick)
Cr/Bw--30 to 40 inches; (Cr) about 90 percent yellowish brown (10YR 5/6) and pale brown (10YR 6/3) soft, fine-grained sandstone that is tilted 40 degrees from horizontal; rock structure; (Bw) the remaining 10 percent is sandy loam in fractures between the tilted sandstone; weak granular structure; hard, friable; very strongly acid; abrupt irregular boundary. (0 to 15 inches thick)
R--40 to 50 inches; yellowish brown (10YR 5/6) hard, fine-grained sandstone, tilted 40 degrees from a horizontal plane.
TYPE LOCATION: Pushmataha County, Oklahoma; about 3 miles east and 2 miles north of Oleta; 0.2 mile west of entrance road to 7G ranch off One Creek road; 1700 feet west and 550 feet south of the northeast corner sec. 10, T. 2 S., R. 19 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 20 to 40 inches and is extremely variable within short distances due to the irregular boundary between the Bw horizon and the underlying tilted bedrock. The soil is moderately acid or strongly acid except where the A horizon has been limed. The fine-earth fraction of the soil is sandy loam, fine sandy loam, or loam. Stony and gravelly phases are recognized.
The A horizon has hue of 10YR, values of 4 or 5, and chromas of 2 or 3. Flat fragments of sandstone less than 3 inches in length make up 10 to 35 percent by volume and more than 3 inches in length make up 10 to 15 percent by volume.
The Bw horizon has hue of 10YR, values of 5 or 6, and chromas ranging from 3 to 6. Flat fragments of sandstone less than 3 inches in length make up 20 to 45 percent by volume and more than 3 inches in length make up 15 to 45 percent by volume.
The Cr layer is brown, red, or yellow, soft, fine grained sandstone that is fractured and tilted 20 to 90 degrees from horizontal.
The R layer is brown, red, or yellowish, hard, fine grained sandstone that is fractured and tilted 20 to 90 degrees from horizontal.
COMPETING SERIES: These are the
Bremo,
Goldston,
Hector,
Manteo,
Montevallo,
Pickens,
Roseland, and
Sulphura series. Bremo soils have mixed mineralogy. Goldston soils are developed from slaty saprolite and have B2t horizons. Hector soils have less than 35 percent coarse fragments in the control section and are less than 20 inches thick to bedrock. Manteo, Montevallo and Pickens soils have mixed mineralogy and are less than 20 inches thick to bedrock. Roseland
soils have A horizons with moist values of 3 or less. Sulphura soils are less than 20 inches thick and have B2t horizons.
GEOGRAPHIC SETTING: Nashoba soils are on nearly level to steep sideslopes and ridges of the Ouachita Mountains, MLRA 119. Slopes range from 1 to 35 percent. Mean annual precipitation ranges from 42 to 56 inches. Mean annual temperature ranges from 59 degrees to 66 degrees F. Thornthwaite annual P-E indices are greater than 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the soils of the competing Pickens series and the Bismarck, Clebit, Honobia, Littlefir, Mazarn, Mena, and Sherless series. Bismarck soils are 10 to 20 inches deep to soft, shale bedrock, and are on similar and steeper landscapes. Clebit soils are 10 to 20 inches deep to hard, sandstone bedrock, and are on similar and steeeper landscape positions. Honobia soils are on similar areas and have clayey-skeletal control sections. Littlefir soils are in a fine textural class, are moderately well drained, and are on similar landscapes. Mazarn soils formed in loamy sediments adjacent to upland drains and intermittent streams, have less than 35 percent rock fragments in the control section, and are somewhat poorly drained. Mena soils formed in pedisediments and old alluvium, have sola greater than 60 inches, and are in a fine textural class. Sherless soils are on similar landscapes, formed in interbedded shale and sandstone, have less than 35 percent rock fragments in the control section, and have an argillic horizon.
DRAINAGE AND PERMEABILITY: Nashoba soils are well drained. Runoff is low to rapid and permeability is moderately rapid.
USE AND VEGETATION: Used mainly for growing trees. The main trees are oak and pine. Also, Spanish-moss grows on the trees.
DISTRIBUTION AND EXTENT: Ouachita Mountains of Oklahoma and possibly in Arkansas. The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Pushmataha County, Oklahoma; 1977.
REMARKS: These soils were previously classified in the Lithosols great soil group. These soils were formerly included in the Goldston series.