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

106 Soil Survey
1 or 2. These horizons have few to common
slickensides and few or common fine rounded masses
of iron-manganese.
The Bkss horizon is in shades of gray or brown in
hue of 10YR, value of 3 to 6, and chroma of 1 to 3.
This horizon has none to common fine brown and gray
mottles, few to common intersecting slickensides, and
few to common fine rounded masses of ironmanganese
and calcium carbonate.
The B’ss horizon is in shades of gray or brown in
hue of 10YR, value of 4 to 7, and chroma of 1 to 4.
This horizon has slickensides that range from few to
common and has none to common fine brown mottles.
Clareville Series
The Clareville series consists of very deep, well
drained, moderately slowly permeable soils that
formed in ancient alluvial sediments. These soils are
on nearly level stream terraces. Slopes range from 0
to 1 percent.
The soils of the Clareville series are fine,
montmorillonitic, hyperthermic Pachic Argiustolls.
Typical pedon of Clareville clay loam, 0 to 1 percent
slopes; from the intersection of U.S. 181 and Texas
Highway 72 in Kenedy, 10 miles south on U.S. 181 to
intersection with Farm Road 743, 1.6 miles east on
Farm Road 743 to private ranch road, 0.6 mile north
and then 0.4 mile west on ranch road, 250 feet south
in pasture. Latitude is 28 degrees 40 minutes 59
seconds North; longitude is 97 degrees 48 minutes
West. Elevation is 403 feet above sea level.
A—0 to 10 inches; black (10YR 2/1) clay loam, black
(10YR 2/1) moist; weak fine and medium
subangular blocky structure; hard, friable, sticky,
plastic; common fine roots throughout; few fine
discontinuous tubular pores; neutral; clear smooth
boundary.
Bt1—10 to 19 inches; black (10YR 2/1) clay, black
(10YR 2/1) moist; weak fine prismatic structure
parting to moderate fine and medium angular
blocky; very hard, very firm, very sticky, very
plastic; common fine roots throughout; common
fine discontinuous tubular pores; very few black
(10YR 2/1) continuous clay films (cutans)
throughout; few fine rounded wormcasts; neutral;
gradual wavy boundary.
Bt2—19 to 33 inches; black (10YR 2/1) clay, black
(10YR 2/1) moist; moderate medium prismatic
structure parting to moderate medium angular
blocky; very hard, very firm, very sticky, very
plastic; few fine roots throughout; common fine
discontinuous tubular pores; very few black (10YR
2/1) continuous clay films (cutans) throughout; few
fine rounded wormcasts; neutral; gradual wavy
boundary.
Btk—33 to 43 inches; very dark gray (10YR 3/1) clay,
very dark gray (10YR 3/1) moist; weak fine
prismatic structure parting to moderate fine and
medium angular blocky; very hard, very firm,
very sticky, very plastic; few fine roots throughout;
few fine discontinuous tubular pores; very few
black (10YR 2/1) patchy clay films (cutans)
throughout; few fine threads and films of calcium
carbonate; moderately alkaline; gradual wavy
boundary.
Bk1—43 to 56 inches; grayish brown (10YR 5/2) clay
loam, dark grayish brown (10YR 4/2) moist;
moderate medium angular blocky structure; hard,
firm, moderately sticky, moderately plastic; few fine
roots throughout; few fine discontinuous tubular
pores; few fine threads and common fine and
medium masses of calcium carbonate; slightly
effervescent; moderately alkaline; gradual wavy
boundary.
Bk2—56 to 64 inches; pale brown (10YR 6/3) clay
loam, brown (10YR 5/3) moist; few fine faint brown
to dark brown (10YR 4/3) mottles; weak fine and
medium subangular blocky structure; hard, firm,
moderately sticky, moderately plastic; few fine
roots throughout; few fine discontinuous tubular
pores; common fine and medium masses of
calcium carbonate; strongly effervescent;
moderately alkaline; gradual wavy boundary.
BCk—64 to 80 inches; very pale brown (10YR 8/4)
sandy clay loam, very pale brown (10YR 7/4)
moist; weak fine subangular blocky structure;
hard, firm, slightly sticky, slightly plastic; very dark
gray material in small pockets in upper part;
common fine and medium masses and fine
rounded concretions of calcium carbonate;
moderately alkaline; strongly effervescent.
The solum thickness ranges from 60 to 80 inches
thick. Depth to secondary carbonates is 28 to 35
inches. The mollic epipedon is 20 to 40 inches thick.
The A horizon is in shades of black, gray, or brown
in hue of 10YR, value of 2 or 3, and chroma of 1 or 2.
Reaction is neutral or slightly alkaline.
The Bt horizon is in shades of black, gray, or brown
in hue of 10YR, value of 2 to 4, and chroma of 1 to 3. It
is noncalcareous clay, clay loam, or sandy clay.
Reaction is neutral or slightly alkaline. Some pedons
have as much as 10 percent fine concretions or
masses of calcium carbonate.
The Btk or Bk horizon is in shades of black, gray, or
brown in hue of 10YR, value of 3 to 6, and chroma of 1
to 4. It is noncalcareous clay, clay loam, or sandy clay.
Reaction is moderately alkaline. It has as much as 15