LOCATION NOBSCOT OK+TX

Established Series
Rev. DDR:CLN:TMK
09/2016

NOBSCOT SERIES

The Nobscot series consists of very deep, well drained, moderately rapidly permeable soils that formed in wind-modified loamy and sandy sediments of Pleistocene age. These soils occur on undulating to hilly stream terraces of the Central Rolling Red Plains (MLRA 78B, 78C). Slope ranges from 0 to 20 percent. Mean annual air temperature is 16 degrees C (61 degrees F), and mean annual precipitation is about 635 mm (25 in).

TAXONOMIC CLASS: Loamy, mixed, superactive, thermic Arenic Paleustalfs

TYPICAL PEDON: Nobscot fine sand, on a convex 4 percent slope, in range, at an elevation of 535 m (1755 ft). (Colors are for dry soil unless otherwise stated.)

A--0 to 12 cm (0 to 5 in) brown (7.5YR 5/2) fine sand, brown (7.5YR 4/2) moist; weak fine granular structure; soft, very friable; many fine and medium roots; slightly acid; gradual wavy boundary. (Thickness of the A horizon is 10 to 20 cm [4 to 6 in])

E--12 to 58 cm (5 to 23 in) pink (7.5YR 7/4) fine sand, light brown (7.5YR 6/4) moist; single grain; loose; many fine and medium roots; slightly acid; clear wavy boundary. (Thickness of the E horizon is 36 to 91 cm [14 to 36 in])

Bt1--58 to 91 cm (23 to 36 in) red (2.5YR 4/6) sandy loam, dark red (2.5YR 3/6) moist; weak coarse prismatic structure; hard, friable; with a few bands about 6 mm (1/4 in) thick of dark reddish brown (2.5YR 3/4) sandy loam; sand grains coated and bridged with clay; few fine and medium roots; few very fine pores; few fine root channels filled or partially filled with clean sand grains; slightly acid; gradual smooth boundary.

Bt2--91 to 135 cm (36 to 53 in) red (2.5YR 5/6) loamy sand, red (2.5YR 4/6) moist; weak coarse prismatic structure; hard, very friable; with thin bands of dark red (2.5YR 3/6) sandy loam about 6 mm (1/4 in) thick and 10 to 15 cm (4 to 6 in)s apart between layers of loamy sand; sand grains coated and bridged with clay; few fine roots; few fine pores; slightly acid; gradual smooth boundary.

Bt3--135 to 180 cm (53 to 71 in) reddish yellow (5YR 6/6) loamy sand, yellowish red (5YR 5/6) moist; weak coarse prismatic structure; hard, very friable; with thin bands of red (2.5YR 4/6) sandy loam about 3 to 25 mm (1/8 to 1 in) thick and 13 cm (5 in) apart between layers of loamy sand; sand grains coated and bridged with clay; few fine roots; about 5 percent by volume of pockets of clean sand grains; slightly acid; diffuse smooth boundary. (Combined thickness of the Bt horizon is 25 to 94 cm [10 to 37 in])

BC--180 to 203 cm (71 to 80 in) reddish yellow (5YR 6/6) fine sand, yellowish red (5YR 5/6) moist; weak coarse prismatic structure; slightly hard, loose; with thin bands of red (2.5YR 4/6) loamy fine sand about 3 mm (1/8 in) thick and 13 cm (5 in) apart between layers of fine sand; about 5 percent by volume of pockets of clean sand grains; slightly acid.

TYPE LOCATION: Beckham County, Oklahoma; 6 miles south and 2 miles east of Sayre; 600 feet east and 80 feet north of the southwest corner of sec. 35, T. 9 N., R. 23 W.

USGS topographic quadrangle: Carter West
Latitude: 35 degrees, 12 minutes, 16.4 seconds N
Longitude: 99 degrees, 36 minutes, 34.9 seconds W
Datum:

Decimal Degrees
Latitude: 35.204555
Longitude: -99.609694

UTM Easting: 444502 m
UTM Northing: 3895898m
UTM Zone: 14

RANGE IN CHARACTERISTICS:
Solum thickness: more than 152 cm (60 in)
Combined thickness of the A and E horizons: 50 to 102 cm (20 to 40 in)

Particle-size control section (weighted average):
Clay content: 8 to 15 percent
CEC/clay ratio: more than 0.6

A horizon:
Hue: 7.5YR or 10YR
Value: 4 or 5, 3 to 4 moist
Chroma: 2 to 4
Other features: in cultivated areas, the Ap horizon is as much as 2 units higher in value and 1 unit higher in chroma
Texture: sand, fine sand, loamy sand, or loamy fine sand
Coarse fragments: amount-0 to 3 percent by volume; size-2 to 5 mm; quartzite
Effervescence: none
Reaction: moderately acid to neutral in areas that have not been limed

E horizon:
Hue: 7.5YR or 10YR
Value: 5 to 8, 4 to 7 moist
Chroma: 2 to 4
Texture: sand, fine sand, loamy sand, or loamy fine sand
Coarse fragments: amount-0 to 3 percent by volume; size-2 to 5 mm; quartzite
Effervescence: none
Reaction: moderately acid to neutral in areas that have not been limed

Upper Bt horizon:
Hue: 2.5YR to 7.5YR
Value: 4 to 6, 3 to 5 moist
Chroma: 6 to 8
Texture: sandy loam or fine sandy loam
Clay content: 8 to 15 percent
Coarse fragments: amount-0 to 3 percent by volume; size-2 to 5 mm; quartzite
Effervescence: none
Reaction: strongly acid to neutral

Lower Bt horizons:
Hue: 2.5YR to 7.5Y
Value: 4 to 7, 3 to 6 moist
Chroma: 6 to 8
Texture: fine sand, loamy sand, loamy fine sand, or fine sandy loam, with lamellae of sandy loam or sandy clay loam. The lamellae range from 3 to 152 mm (1/8 inch to 6 in) thick and 5 to 15 cm (2 to 6 in) apart.
Pockets of clean sand grains: occur in the lower portion of most pedons
Clay content: 2 to 15 percent
Coarse fragments: amount-0 to 3 percent by volume; size-2 to 5 mm; quartzite
Effervescence: none
Reaction: strongly acid to neutral

BC horizons:
Hue: 2.5YR to 7.5YR
Value: 4 to 7, 3 to 6 moist
Chroma: 6 to 8
Texture: fine sand, loamy sand, or loamy fine sand with lamellae that range from 3 to 50 mm (1/8 to 2 in) thick and 10 to 31 cm (4 to 12 in) apart. The lamellae have more clay content and lower color values than the matrix.
Pockets of clean sand grains: occur in the lower portion of most pedons
Clay content: 2 to 10 percent
Coarse fragments: amount-0 to 3 percent by volume; size-2 to 5 mm; quartzite
Effervescence: none
Reaction: slightly acid to neutral

C horizon (where present):
Some pedons have a C horizon that is similar in color, texture, and reaction to the BC horizon. The lamellae decrease in thickness and increase in distance apart with depth.

COMPETING SERIES: There are no competing series. Series in similar families are the Dougherty and Stidham series.
Dougherty and Stidham soils: are moist for longer periods of time during the growing season

GEOGRAPHIC SETTING:
Parent material: loamy and sandy alluvial sediments of Pleistocene age that have been reworked by the wind
Landscape: alluvial plains
Landform: undulating to hilly sand sheets or stream terraces
Slope: 0 to 20 percent
Mean annual air temperature range: 14 to 18 degrees C (57 to 64 degrees F)
Mean annual precipitation range: 533 to 686 mm (21 to 27 in)
Frost-free period: 185 to 230 days
Elevation: 396 to 762 m (1300 to 2500 ft)
Thornthwaite annual P-E indices: 32 to 44

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Delwin, Devol, Eda, Grandfield, Springer, and Tivoli series.
Delwin and Grandfield series: occur on adjacent or slightly lower areas that are slightly concave, have a sandy clay loam argillic horizon, and do not have a sandy surface layer greater than 50 cm (20 in)
Devol and Springer series: occur on slightly lower undulating to hummocky areas and do not have a sandy surface layer greater than 50 cm (20 in)
Eda and Tivoli series: occur on slightly higher hummocky or dune areas, do not have an argillic horizon, and are sandy throughout

DRAINAGE AND PERMEABILITY:
Drainage class: well drained
Permeability: moderately rapid
Runoff: negligible on slopes less than 1 percent, very low on 1 to 5 percent slopes, and low on 5 to 20 percent slopes

USE AND VEGETATION: Used mainly as native range for beef cattle. Some of the undulating and hummocky areas are cultivated to sorghums, small grains, and alfalfa. Some areas are used for improved pasture. Native vegetation consists of shinnery oak with an understory of tall grasses. Near the eastern extent of these soils, the shinnery oak ranges up to 8 m (25 ft) tall and are in small circular areas intermingled with shrubby plants 1 to 1.5 m (2 to 5 ft) tall.

DISTRIBUTION AND EXTENT: Central Great Plains Winter Wheat and Range
Region; Central Rolling Red Plains (MLRA 78B, 78C) of Oklahoma and Texas. The series is extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Roger Mills County, Oklahoma; 1959.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 to 58 cm (0 to 23 in) (A and E horizons)
Argillic horizon: 58 to 180 cm (23 to 71 in) (Bt horizons)

ADDITIONAL DATA: Sample No. 72-OK-05-01 by Oklahoma State University, Stillwater Oklahoma. Sample No. S59-OK-77-2 by Kellogg Soil Survey Laboratory, Lincoln, Nebraska. Sample No. S00-OK-055-005 by Kellogg Soil Survey Laboratory, Lincoln, Nebraska.

Taxonomic version: Keys To Soil Taxonomy, Twelfth Edition, 2014

National Cooperative Soil Survey
U.S.A.