Soil Survey of Dallas County, Texas Page: 68
vii, 153 p., 70 fold. p. of plates : ill., maps ; 29 cm.View a full description of this book.
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SOIL SURVEY
feet downstream and 200 feet north of the river channel,
inside the levees in Dallas:
Al1-0 to 7 inches; dark gray (10YR 4/1) clay, very dark
gray (10YR 3/1) moist; moderate fine and medium
subangular blocky structure; very hard, very firm; few
fine siliceous pebbles; calcareous; moderately alka-
line; clear smooth boundary.
A12-7 to 20 inches; dark gray (10YR 4/1) clay, very
dark gray (10YR 3/1) moist; moderate fine and
medium blocky structure; few slickensides in lower
part; extremely hard, very firm; calcareous; moder-
ately alkaline; diffuse smooth boundary.
A13-20 to 45 inches; very dark gray (10YR 3/1) clay,
black (10YR 2/1) moist; moderate medium blocky
structure; common intersecting slickensides through-
out; extremely hard, very firm; calcareous; moderate-
ly alkaline; diffuse smooth boundary.
A14-45 to 68 inches; dark grayish brown (2.5Y 4/2)
clay, very dark grayish brown (2.5Y 3/2) moist; weak
coarse blocky structure; extremely hard, very firm;
calcareous; moderately alkaline.
The soil is moderately alkaline and calcareous
throughout. It has cracks that extend to a depth of more
than 30 inches; the cracks are as much as 2 cm wide at
a depth of 20 inches. Intersecting slickensides are be-
tween depths of 10 to 40 inches.
When the soil is dry, the A horizon is dark gray, very
dark gray, or black. The Ap horizon, if present, is very
dark grayish brown. In some pedons, the subsurface
layer is faintly mottled in shades of olive and olive
yellow. In some pedons, the soil has chroma of 2 or
more below a depth of about 24 inches; these areas are
mainly on flood plains of streams, such as Mesquite
Creek, that drain into the East Fork and Elm Fork of the
Trinity River. In some pedons, there are calcium carbon-
ate concretions and black concretions (probably of iron
and manganese) throughout the pedon.
Vertel series
The Vertel series is made up of sloping to strongly
sloping soils that formed in clayey marine sediment on
uplands. The slopes range from 5 to 12 percent.
Typical pedon of Vertel clay, 5 to 12 percent slopes;
from the intersection of Farm Road 1382 and Camp
Wisdom Road, this pedon is located 1.8 miles south on
Farm Road 1382 and 100 feet west in rangeland:
AI-0 to 14 inches; olive (5Y 5/3) clay, olive (5Y 4/3)
moist; strong fine and medium subangular blocky
structure; extremely hard, very firm, very sticky and
plastic; few fine and medium roots; common worm
casts; few fine pebbles; common pressure faces in
lower part; moderately alkaline; gradual wavy bound-
ary.
AC-14 to 24 inches; olive gray (5Y 5/2) clay, olive gray
(5Y 4/2) moist; moderate medium and coarseblocky structure; extremely hard, very firm, very
sticky and plastic; few fine roots, mainly on the
faces of peds; common vertical cracks 1 inch wide;
common intersecting slickensides and wedge-
shaped parallepipeds; moderately alkaline; gradual
wavy boundary.
Cr-24 to 60 inches; dark gray (5Y 4/1) weathered shale
and clay, very dark gray (5Y 3/1) moist; common
mediuCm distinct olive (5Y 5/3) and dark yellowish
brown (10YR 4/4) mottles; strong fine platy rock
structure; very hard, very firm; few vertical cracks in
upper part; many fine gypsum crystals; medium acid.
The solum is 24 to 40 inches thick. The A and AC
horizons are 60 to 76 percent clay. When the soil is dry,
cracks 0.5 inch to 1.5 inches wide extend into the upper
part of the Cr horizon. Where the soil has not been tilled,
there is a gilgai microrelief that has microdepressions 1
to 3 feet wide and 2 to 8 inches deep and microknolls
10 to 16 feet wide that are oriented up and down the
slopes.
The A horizon is dark grayish brown, grayish brown, or
olive. It is neutral to moderately alkaline. The soil is
noncalcareous throughout more than half of any one
pedon.
The AC horizon is dark grayish brown, grayish brown,
olive gray, olive, light olive brown, or light brownish gray.
In some pedons, it has few to common mottles of yel-
lowish brown, olive brown, brown, or yellowish red. The
AC horizon is neutral to moderately alkaline. It has few
to common gypsum crystals. In some pedons, there are
a few fine strongly cemented concretions of calcium
carbonate in this horizon.
The Cr horizon is stratified, weathered shale or shale
and clay. It is gray, dark gray, yellowish brown, or yellow.
In some pedons, the strata are olive brown or yellowish
red. The Cr horizon is medium acid to moderately alka-
line. It has few to common gypsum crystals.
Wilson series
The Wilson series is made up of deep, somewhat
poorly drained, nearly level and gently sloping loamy
soils. Wilson soils formed in clayey marine sediment on
uplands. The slopes range from 0 to 3 percent.
Typical pedon of Wilson clay loam, 0 to 1 percent
slopes; from the intersection of Belt Line Road and
Apollo Road in Grand Prairie, this pedon is located 1,050
feet south on Belt Line Road and 100 feet east in idle
cropland:
Ap---0 to 5 inches; dark grayish brown (10YR 4/2) clay
loam, very dark grayish brown (10YR 3/2) moist;
moderate fine to medium subangular blocky struc-
ture; very hard, firm; mildly alkaline; abrupt wavy
boundary.
B21tg-5 to 13 inches; dark gray (10YR 4/1) clay, very
dark gray (10YR 3/1) moist; moderate medium68
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General Soil Map, Dallas County, Texas (Map)
Map displays soil types along with creeks, towns, schools, churches, power transmission lines, oil and gas pipelines, roads, and railroads. Includes legend and symbols. Scale 1:253,400
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Coffee, Daniel R. Soil Survey of Dallas County, Texas, book, 1980; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth130211/m1/78/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.