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

Karnes County, Texas 137
dry, cracks as much as 2.5 inches wide extend to a
depth of more than 20 inches. Reaction is neutral to
moderately alkaline.
The A horizon has hue of 10YR, value of 2 or 3,
and chroma of 1, or N 2/0. A few slickensides occur in
the lower part.
The Bss horizon has hue of 10YR or 7.5YR, value
of 3 to 5, and chroma of 1, or N 2/0. This horizon has
few to common slickensides.
The Bkss horizon has hue of 10YR, value of 4 to 7,
and chroma of 1 or 2. The horizon has few to common
fine and medium calcium carbonate concretions. It
contains few or common slickensides and few fine
rounded masses of iron-manganese. It has none to
common fine or medium brown mottles.
The BCss horizon has hue of 10YR or 2.5Y, value
of 6 or 7, and chroma of 2 or 3. It contains few or
common slickensides and few fine rounded masses of
iron-manganese. It has none to common, fine or
medium brown mottles.
Tordia Series
The Tordia series consists of deep, well drained,
very slowly permeable soils that formed in clayey
sediments over shale and sandstone that contain
volcanic ash and shards. These gently sloping soils
are on uplands. Slopes range from 1 to 5 percent.
The soils of the Tordia series are fine,
montmorillonitic, hyperthermic Vertic Haplustolls.
Typical pedon of Tordia clay, 1 to 3 percent slopes;
from the intersection of Texas Highway 80 and Farm
Road 627, west 2.7 miles on Farm Road 627, and 250
feet south in cropland. Latitude is 29 degrees, 02
minutes, 35 seconds North; longitude is 97 degrees,
50 minutes, 30 seconds West. The elevation is 318
feet above sea level.
Ap—0 to 8 inches; black (10YR 2/1) clay; black (10YR
2/1) moist; weak fine subangular blocky structure;
very hard, very firm, very sticky, very plastic;
common fine roots throughout; few fine
discontinuous tubular pores; slightly alkaline;
abrupt smooth boundary.
A—8 to 16 inches; black (10YR 2/1) clay; black (10YR
2/1) moist; weak fine and medium subangular
blocky structure; very hard, very firm, very sticky,
very plastic; common fine roots throughout; few
fine discontinuous tubular pores; few faint
pressure faces; moderately alkaline; clear smooth
boundary.
Bw1—16 to 28 inches; black (10YR 2/1) clay; black
(10YR 2/1) moist; moderate medium angular
blocky structure; extremely hard, extremely firm,
very sticky, very plastic; few fine roots throughout;
few fine discontinuous tubular pores; few thin films
of fine sand on vertical ped surfaces; very few
distinct pressure faces; few slickensides;
moderately alkaline; gradual wavy boundary.
Bw2—28 to 37 inches; dark gray (10YR 4/1) clay; dark
gray (10YR 4/1) moist; moderate medium angular
blocky structure; extremely hard, extremely firm,
very sticky, very plastic; few fine roots throughout;
few fine discontinuous tubular pores; few distinct
pressure faces; few cracks filled with black
material; few slickensides; moderately alkaline;
gradual wavy boundary.
BC—37 to 43 inches; light gray to gray (10YR 6/1),
and pale yellow (2.5Y 7/4) clay; gray (10YR 5/1),
and light yellowish brown (2.5Y 6/4) moist; weak
fine subangular blocky structure; extremely hard,
extremely firm, very sticky, very plastic; few
pockets of reddish yellow and yellow material in
lower part; few fine and medium plate-like gypsum
crystals; moderately alkaline; gradual wavy
boundary.
2Cry—43 to 80 inches; light gray (2.5Y 7/2) weakly
consolidated shale that has clay texture; light
brownish gray (2.5Y 6/2) moist; massive;
extremely hard, extremely firm; common layers of
reddish yellow and yellow material throughout;
common fine and medium plate-like gypsum
crystals; moderately alkaline.
The solum is 40 to 60 inches thick. It is clay. Cracks
1 to 2 inches wide extend to a depth of more than 20
inches. A few slickensides occur from a depth of 16 to
36 inches. Some pedons have calcium carbonates at a
depth of 27 inches. Reaction is neutral to moderately
alkaline.
The A horizon is black, very dark gray, or dark gray
in hue of 10YR, value of 2 to 4, and chroma of 1.
The B horizon is in shades of black, gray, or brown
in hue of 10YR, value of 2 to 5, and chroma of 1 or 2.
Some pedons have a Bk or a Bkz horizon that has
similar colors and texture as the B horizon.
The BC horizon is in shades of gray or brown in hue
of 10YR, value of 4 to 6, and chroma of 1 to 3. Some
pedons have a BCk or a BCkz horizon that has similar
colors and texture as the BC horizon.
The Cr horizon is in shades of brown, gray, or white
in hue of 10YR or 2.5Y, value of 5 to 8, and chroma of
2 or 3. It is shale that has clay texture or shale
interbedded with weakly cemented sandstone. Some
pedons have a Ck or Ckz horizon that has similar
colors and textures to those of the Cr horizon.