LOCATION COSH TXEstablished Series
TAXONOMIC CLASS: Loamy, mixed, active, thermic, shallow Typic Rhodustalfs
TYPICAL PEDON: Cosh fine sandy loam--pasture.
(Colors are for dry soil unless otherwise stated.)
A1--0 to 6 inches; reddish brown (2.5YR 5/4) fine sandy loam, dark reddish brown (2.5YR 3/4) moist; weak granular structure and single grained; hard, very friable; many grass roots; neutral;
clear smooth boundary. (4 to 10 inches thick)
B2t--6 to 16 inches; reddish brown (2.5YR 4/4) sandy clay
loam, dark reddish brown (2.5YR 3/4) moist; moderate coarse
prismatic structure, parting to fine and very fine subangular
blocky structure; very hard, friable; many grass roots; many fine
and very fine pores; few wormcasts; thin patchy clay films on
prism faces; neutral; abrupt smooth boundary. (6 to 14 inches
thick)
Cr--16 to 24 inches; red (2.5YR 4/6) weakly cemented
sandstone; massive; extremely hard; neutral.
TYPE LOCATION: Hardeman County, Texas; in pasture 100 feet west
of county road, and 3.6 miles east and 0.65 mile south via county road from its intersection with Highway 283, which intersection is
10 miles south of Quanah, Texas via Texas Highway 283.
RANGE IN CHARACTERISTICS: Thickness of the solum to sandstone
rock ranges from 12 to 20 inches.
The texture of the A horizon is mostly fine sandy loam, but varies
to loamy fine sand in some pedons that are winnowed. The A
horizon ranges in hue from 2.5YR to 7.5YR, value from 4 to 5, and chroma from 3 to 4. Reaction of the A horizon ranges from
slightly acid to neutral. The organic matter content of the A horizon is less than 1 percent.
The Bt horizon ranges from neutral to mildly alkaline. The Bt horizon ranges in hue from 10R to 2.5YR, value 3 to 5, and chroma
4 to 6.
The C horizon varies from weakly consolidated to hard sandstone
with a hardness of about 2 on Moh's scale. The color ranges from
red to reddish brown. Typically, the sandstone is noncalcareous,
but in a few places thin calcium carbonate coats part of the sandstone faces in fissures.
COMPETING SERIES: These are the
Cobb,
Dill,
Exray,
Hensley,
Latom,
Ligon,
Lucien,
Oben,
Pontotoc,
Quinlan, and
Stephenville series. Cobb, Dill, Pontotoc, and Stephenville, soils have sola thicker than 20 inches. Exray and Hensley soils have clayey
argillic horizons. Latom, Lucien, and Quinlan soils do not have argillic horizons. Ligon soils are over schist. Oben soils have argillic horizons in hues of 5YR or yellower.
GEOGRAPHIC SETTING: These soils are on nearly level to undulating uplands having surfaces that are convex to plane. Slopes range
from 1 to 8 percent, but are mostly about 1 to 4 percent. The
medium grained sandstone beneath the solum is mostly noncalcareous but alkaline, and in places is interbedded with calcareous clayey
and silty redbeds. These rocks are of Triassic and Permian age.
The climate is dry subhumid. Thornthwaite annual P-E indices are
28 to about 40 and the average annual precipitation ranges from 20
to 26 inches. At the type location, the average annual air temperature is about 63 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Cobb and Latom series and the Miles series. Miles soils are deep soils and have hues of 5YR included for the Bt horizon.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is slow to
rapid. Permeability is moderate.
USE AND VEGETATION: Dominantly used for rangeland. About 40
percent of these soils are in cultivation. Native grasses consist mainly of buffalograss, blue grama, sideoats grama, little
bluestem, and threeawn. Mesquite trees occur in some areas.
DISTRIBUTION AND EXTENT: Western Texas and southwestern Oklahoma. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Hardeman County, Texas; 1966.
REMARKS: These soils were classified in the Reddish Chestnut
great soil group.