Soil Survey of Karnes County, Texas - Soil Data Mart - US ...

130 Soil Survey
noncalcareous, siltstone that has texture of silt loam or
loam. This layer slakes in water. A few thin films and
threads of calcium carbonate are mainly in the upper
part of the horizon.
Pernitas Series
The Pernitas series consists of very deep, well
drained, moderately permeable soils that formed in
calcareous loamy sediments. These soils are on very
gently sloping to moderately sloping uplands. Slopes
range from 2 to 8 percent.
The soils of the Pernitas series are fine-loamy,
mixed, hyperthermic Typic Argiustolls.
Typical pedon of Pernitas sandy clay loam, 2 to 5
percent slopes; from the intersection of U.S. Highway
181 and Texas Highway 72 in Kenedy, 4.4 miles west
on Texas Highway 72, and 570 feet north in pasture.
Latitude is 28 degrees 46 minutes 04 seconds North;
longitude is 97 degrees 54 minutes 41 seconds West.
Elevation is 415 feet above sea level.
A—0 to 7 inches; dark gray (10YR 4/1) sandy clay
loam, very dark gray (10YR 3/1) moist; weak fine
subangular blocky structure; slightly hard, firm,
slightly sticky, slightly plastic; common fine roots;
common fine pores; few termite and wormcasts;
slightly effervescent; slightly alkaline; clear smooth
boundary.
Bt1—7 to 15 inches; dark grayish brown (10YR 4/2)
sandy clay loam, very dark grayish brown (10YR
3/2) moist; weak fine prismatic structure parting to
moderate fine and medium angular blocky; hard,
firm, slightly sticky, slightly plastic; common fine
roots; few fine pores; common thin discontinuous
clay films on surfaces of peds; few termite and
wormcasts; slightly effervescent; slightly alkaline;
clear smooth boundary.
Bt2—15 to 21 inches; brown (10YR 5/3) sandy clay
loam, dark brown (10YR 4/3) moist; weak fine
prismatic structure parting to moderate fine and
medium angular blocky; hard, firm, slightly sticky,
slightly plastic; common fine roots; few fine pores;
common thin discontinuous clay films on surfaces
of peds; few fine threads and masses of calcium
carbonate; few snail shell fragments; few
wormcasts filled with very dark grayish brown
material; slightly effervescent; slightly alkaline;
clear smooth boundary.
Btk—21 to 33 inches; dark brown (7.5YR 4/4) sandy
clay loam, dark brown (7.5YR 4/4) moist;
moderate fine and medium angular blocky
structure; very hard, very firm, slightly sticky,
slightly plastic; few fine roots; few fine pores;
common thin continuous clay films on surfaces of
peds; few fine threads and common fine and
medium masses of calcium carbonate; very dark
gray material filled in cracks; few snail shells
fragments; strongly effervescent; moderately
alkaline; gradual smooth boundary.
Bk1—33 to 50 inches; light yellowish brown (10YR
6/4) sandy clay loam, yellowish brown (10YR 5/4)
moist; moderate fine and medium subangular
blocky structure; hard, firm, slightly sticky, slightly
plastic; few fine and very fine roots; common
medium and coarse masses of calcium carbonate,
few fine threads of calcium carbonate; violently
effervescent; moderately alkaline; gradual smooth
boundary.
Bk2—50 to 80 inches; very pale brown (10YR 7/4)
sandy clay loam, light yellowish brown (10YR 6/4)
moist; weak fine subangular blocky structure;
hard, firm, slightly sticky, slightly plastic; few fine
and very fine roots; many medium and coarse
masses of calcium carbonate; violently
effervescent; moderately alkaline.
The solum is 60 to more than 80 inches thick.
Reaction is slightly alkaline or moderately alkaline.
The A horizon is very dark gray, dark gray, or very
dark grayish brown in hue of 10YR, value of 3 or 4,
and chroma of 1 or 2.
The Bt horizon is dark grayish brown, brown,
grayish brown, strong brown, pale brown, or very pale
brown in hue of 10YR or 7.5YR, value of 4 to 7, and
chroma of 2 to 4. It is sandy clay loam or clay loam.
The Bk horizon is dark yellowish brown, brown, pale
brown, very pale brown, light yellowish brown, or white
in hue of 10YR or 7.5YR, value of 6 to 8, and chroma
of 2 to 4. It is sandy clay loam or clay loam.
Pettus Series
The Pettus soils consists of very deep, well drained,
moderately permeable soils that formed in calcareous
loamy sediments of Pleistocene or Pliocene age.
These very gently sloping to gently sloping soils are
on upland ridges and upper side slopes. Slopes range
from 2 to 5 percent.
The soils of the Pettus series are loamy-skeletal,
carbonatic, hyperthermic Typic Calciustolls.
Typical pedon of Pettus loam, 2 to 5 percent slopes;
from the intersection of Texas Highway 72 and U.S.
Highway 181, 11 miles south on U.S. 181 to
intersection with Farm Road 743, 7 miles east on
Farm Road 743 to private ranch road, 0.6 mile west on
ranch road, and 600 feet east in rangeland. Latitude is
28 degrees 41 minutes 59 seconds North; longitude is