Agriculture Reference
In-Depth Information
Table 3.2
Description of Craig Soil (circa 1952)
Great Soil Group
Reddish Prairie (maximal)
Family
Craig
Series included
Craig
Drainage class
Good
Texture class
Loamy (medium)
Horizons
Degree of Development
A1
Strong
A3 & B1
Medium
B2
Strong
C
Degree of weathering
Strong (moderately strong)
Size of profile
Medium
Kind of phases
Depth, slope, erosion
Parent material
Residuum from interbedded cherty limestone and shale
Climate
Moderately humid, temperate
Table 3.3
A Modern Description of the Craig Series
LOCATION CRAIG OK + MO
The Craig series is a member of the clayey-skeletal, mixed, thermic family of Mollic Paleudalfs. These soils
have very dark brown and very dark grayish brown silt loam A horizons, dark grayish brown silt loam E
horizons, brown silt loam BE horizons, dark yellowish brown and yellowish red very cherty clay loam Bt
horizons, and BC horizons.
TAXONOMIC CLASS:
Clayey-skeletal, mixed, thermic Mollic Paleudalfs
TYPICAL PEDON:
Craig silt loam — rangeland.
(Colors are for moist soil unless otherwise stated.)
A1
— 0-7 in., 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; medium acid; gradual smooth boundary
(6 to 12 in. thick)
A2
— 7-12 in., 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 fragments of chert; strongly
acid; gradual smooth boundary (0 to 10 in. thick)
E
— 12-16 in., 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 fragments of chert; strongly
acid; gradual wavy boundary (3 to 5 in. thick)
BE
— 16-21 in., brown (10YR 5/3) silt loam, pale brown (10YR 6/3) dry; weak medium subangular blocky
structure; hard, friable; few fine roots and pores; 10% medium fragments of chert; common 2 to 8 mm dark
concretions; strongly acid; gradual wavy boundary (3 to 12 in. thick)
Bt1
— 21-25 in., dark yellowish brown (10YR 4/4) very cherty clay loam; yellowish brown (10YR 5/4) dry;
moderate very fine blocky structure; hard, friable; few fine roots and pores; 60 to 70% by volume of chert
fragments from 2 mm to 100 mm in diameter; thin patchy clay films on faces of peds and chert fragments;
common 2 to 5 mm dark concretions; strongly acid; gradual wavy boundary (4 to 16 in. thick)
Bt2
— 25-42 in., yellowish red (5YR 5/6) very cherty clay loam; common fine, medium, and coarse reddish
and brownish mottles on the chert fragments; weak very fine blocky structure; hard, friable; few fine roots
and pores; 75 to 85% by volume chert fragments from 2 to 100 mm; thin patchy clay films on faces of peds,
on chert fragments, and in pores; strongly acid; gradual wavy boundary (10 to 30 in. thick)
BC
— 42-60 in., yellowish red (5YR 5/6) very cherty clay loam; common reddish and brownish mottles;
structure is obscured by the chert; hard, friable; fractured chert ranges from 2 to 100 mm in diameter and
occupies about 85% of the volume; strongly acid
TYPE LOCATION:
Craig County, Oklahoma; about 5 miles southeast of Vinita; about 3150 ft south and 50
ft east of the northwest corner of sec. l2, T. 24 N., R. 20 E.
RANGE IN CHARACTERISTICS:
Solum thickness ranges from 60 to more than 80 in. The depth to horizons
containing more than 35% chert by volume ranges from 15 to 30 in. The soil ranges from medium acid
through very strongly acidic throughout.
T
he A horizon
is black (10YR 2/1), very dark brown (10YR 2/2), very dark gray (10YR 3/1), very dark grayish
brown (10YR 3/2), or dark brown (10YR 3/3). It is loam, silt loam, cherty loam, or cherty silt loam. Coarse
fragments more than 3 in. diameter range from 0 to 5% of the volume and coarse fragments less than 3
in. diameter range from 0 to 35% of the volume.
continued
