LOCATION CRAIG OK+MO

Established Series
Rev. ECN-RGC
08/2015

CRAIG SERIES

The Craig series consists of very deep, well drained soils that formed in cherty residuum weathered from Pennsylvanian age limestone. These soils are on summits, shoulders and side slopes within the Cherokee Prairies (MLRA 112). Slope ranges from 0 to 5 percent. Mean annual precipitation is about 1143 mm (45 inches), and mean annual temperature is about 15 degrees C (59 degrees F).

TAXONOMIC CLASS: Clayey-skeletal, mixed, active, thermic Mollic Paleudalfs

TYPICAL PEDON: Craig silt loam - in rangeland on the shoulder of an interfluve, at an elevation of 225 meters (738 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)

A1--0 to 18 cm (0-7 inches), very dark brown (10YR 2/2) silt loam, dark gray (10YR 4/1) dry; moderate medium and fine granular structure; hard, friable; many fine roots; common fine pores; moderately acid; gradual smooth boundary. (15 to 31 cm (6 to 12 inches) thick)

A2--18 to 30 cm (7-12 inches), very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; weak fine granular structure; hard, friable; common fine roots and pores; few medium (2 to 20 mm) fragments of chert; strongly acid; gradual smooth boundary. (0 to 25 cm (0 to 10 inches) thick)

E--30 to 41 cm (12-16 inches), dark grayish brown (10YR 4/2) silt loam, light brownish gray (10YR 6/2) dry; weak medium granular structure; hard, friable; common fine roots and pores; few medium (2 to 20 mm) fragments of chert; strongly acid; gradual wavy boundary. (8 to 13 cm (3 to 5 inches) thick)

BE--41 to 53 cm (16-21 inches), brown (10YR 5/3) silt loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; hard, friable; few fine roots and pores; common 2 to 8 mm dark concretions; 10 percent medium (2 to 20mm) fragments of chert; strongly acid; gradual wavy boundary. (8 to 31cm (3 to 12 inches) thick)

2Bt1--53 to 64 cm (21-25 inches), dark yellowish brown (10YR 4/4) extremely gravelly clay loam; yellowish brown (10YR 5/4) dry; moderate very fine blocky structure; hard, friable; few fine roots and pores; common 2 to 5 mm dark concretions; 60 to 70 percent by volume of chert fragments from 2 mm to 100 mm in diameter; thin patchy clay films on faces of peds and chert fragments; strongly acid; gradual wavy boundary. (10 to 41 cm (4 to 16 inches) thick)

2Bt2--64 to 107 cm (25-42 inches), yellowish red (5YR 5/6) extremely gravelly clay loam; weak very fine blocky structure; hard, friable; few fine roots and pores; thin patchy clay films on faces of peds, on chert fragments, and in pores; common fine, medium, and coarse reddish and brownish redoximorphic masses on the chert fragments; 75 to 85 percent by volume chert fragments from 2 mm to 100 mm; strongly acid; gradual wavy boundary. (25 to 76 cm (10 to 30 inches) thick)

2BC--107 to 152 cm (42-60 inches), yellowish red (5YR 5/6) extremely gravelly clay loam; structure is obscured by the chert fragments; hard, friable; common reddish and brownish redoximorphic masses; fractured chert ranges from 2 mm to 100 mm in diameter and occupies about 85 percent of the volume; strongly acid.

TYPE LOCATION: Craig County, Oklahoma; about 8 kilometers (5 miles) southeast of Vinita; about 960 meters (3150 feet) south and 15 meters (50 feet) east of the northwest corner of sec. l2, T. 24 N., R. 20 E.; USGS Big Cabin, Oklahoma topographic quadrangle; lat. 36 degrees 34 minutes 23.45 seconds N. and long. 95 degrees 7 minutes 51.31 seconds W.; UTM Zone 15, 309332 easting and 4049641 northing, NAD 83.

RANGE IN CHARACTERISTICS: Solum thickness ranges from 152 cm (60 inches) to more than 203 cm (80 inches). The depth to horizons containing more than 35 percent chert by volume ranges from 38 to 76 cm (15 to 30 inches). The soil ranges from moderately acid to very strongly acid throughout.

A horizon:
Hue: 10YR
Value: 2 or 3
Chroma: 1 to 3
Texture: loam, silt loam, gravelly loam, or gravelly silt loam.
Clay content: 15 to 26 pecent
Rock fragment content: 0 to 35 percent coarse fragments less than 76 mm (3 inches) diameter, 0 to 5 percent coarse fragments more than 76 mm (3 inches) diameter.

E horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 1 to 3
Texture: loam, silt loam, gravelly loam, or gravelly silt loam.
Clay content: 15 to 26 percent
Rock fragment content: 0 to 35 percent coarse fragments less than 76 mm (3 inches) diameter, 0 to 5 percent coarse fragments more than 76 mm (3 inches) diameter.

BE horizon:
Hue: 7.5YR or 10YR
Value: 3 to 5
Chroma: 2 to 4
Texture: loam, silt loam, clay loam, silty clay loam, gravelly loam, gravelly silt loam, gravelly clay loam, gravelly silty clay loam, very gravelly loam, very gravelly silt loam, very gravelly clay loam or very gravelly silty clay loam.
Rock fragment content: 1 to 50 percent coarse fragments less than 76 mm (3 inches) diameter, 0 to 5 percent coarse fragments more than 76 mm (3 inches) diameter.

2Bt horizon:
Hue: 5YR to 10YR
Value: 4 to 6
Chroma: 3 to 8
Texture: very gravelly silty clay loam, very gravelly clay loam, very gravelly clay, very gravelly silty clay, extremely gravelly silty clay loam, extremely gravelly clay loam, extremely gravelly clay, or extremely gravelly silty clay.
Clay content: The upper 50 cm (20 inches) 35 to 55 percent
Rock fragment content: 35 to 90 percent coarse fragments less than 76 mm (3 inches) diameter, 5 to 10 percent coarse fragments more than 76 mm (3 inches) diameter.

BC horizon:
Hue: 2.5YR to 7.5YR
Value: 4 to 6
Chroma: 6 or 8
Texture: very gravelly clay loam, very gravelly clay, extremely gravelly clay loam, or extremely gravelly clay
Clay content: 28 to 55 percent
Rock fragment content: 35 to 90 percent coarse fragments less than 76 mm (3 inches) diameter, 5 to 10 percent coarse fragments more than 76 mm (3 inches) diameter.

R horizon: layer of cherty limestone occurs at depths ranging from 152 cm (5 feet) to 914 cm (30 feet) below the surface.

COMPETING SERIES: These are no competing series.

GEOGRAPHIC SETTING: The Craig soils are on uplands. Slope ranges from 0 to 5 percent, but mainly less than 3 percent. The Craig soils formed in residuum weathered from cherty limestones of Pennsylvanian age. Mean annual precipitation ranges from about 940 to 1194 mm (37 to 47 inches). Mean the annual annual air temperature ranges from 14 to 17 degrees C (57 to 62 degrees F). Elevation is 175 to 340 meters 574 to 1115 feet) above mean sea level. Thornthwaite P-E indices from 64 to about 80.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Eldorado series, and the Bates, Dennis, and Parsons soils. Bates, Dennis, and Parsons soils contain little or no chert.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained. Potential for surface runoff is medium. Saturated hydraulic conductivity is moderately high. Permeability is moderately slow.

USE AND VEGETATION: Some areas cultivated to small grains and sorghums. Some areas are in native range of tall prairie grasses or in improved pasture. The native vegetation is tall grass prairie.

DISTRIBUTION AND EXTENT: MLRAs 112 and 116 in northeastern Oklahoma and possibly in southwestern Missouri, northwestern Arkansas, and southeastern Kansas. The type location is in MLRA 112. The series is minor in extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana

SERIES ESTABLISHED: Craig County, Oklahoma; 1931.

REMARKS: Diagnostic horizons and features recognized in the pedon are:
Mollic epipedon: from the surface to a depth of 30 cm (12 inches) (A1, A2 horizons).
Albic horizon: from a depth of 30 to 41 cm (12 to 16 inches) (E horizon).
Agrillic horizon: from a depth of 53 to 107 cm (21 to 42 inches) 2Bt1, 2Bt2 horizons).

NASIS data mapunit ID 699768 represents the typical pedon. Other NASIS DMU ID's are 699769 representing other phases to the series.

The Craig soils were formerly classified in the Brunizem great soil group.

ADDITIONAL DATA: User pedon ID 1968OK035009 represents the typical pedon.

National Cooperative Soil Survey
U.S.A.