Soil Survey of Dallas County, Texas Page: 60
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SOIL SURVEY
The solum is more than 70 inches thick. The organic
matter content is less than 1 percent. Throughout the
control section, the soil is coarser than loamy very fine
sand.
When the soil is dry, the A horizon is brown or yellow-
ish brown. It ranges from neutral to mildly alkaline.
The Bt horizon is strong brown, reddish brown, or
reddish yellow.
The Eufaula soils in this survey area are taxadjuncts to
the Eufaula series because the Bt horizon of fine sandy
loam is in streaks and splotches and not in lamellae;
however, these soils are similar to the soils of the Eu-
faula series in use and management.
Ferris series
The Ferris series consists of deep, well drained, slop-
ing and strongly sloping clayey soils. Ferris soils formed
in clayey marine sediment on uplands. The slopes range
from 5 to 12 percent.
Typical pedon of Ferris clay, in an area of Ferris-
Heiden complex, 5 to 12 percent slopes; from the inter-
section of Belt Line Road and Pioneer Road, this pedon
is located about 1.5 miles south of Mesquite, 3,000 feet
northeast along Pioneer Road, and 50 feet west in a
pasture:
A1-0 to 3 inches; light yellowish brown (2.5Y 6/4) clay,
light olive brown (2.5Y 5/4) moist; weak fine and
very fine subangular blocky structure; extremely
hard, very firm; many fine roots; common worm
casts; few fine concretions of calcium carbonate;
calcareous; moderately alkaline; abrupt wavy bound-
ary.
A12-3 to 16 inches; olive (5Y 5/4) clay, olive (5Y 4/4)
moist; strong very fine and fine blocky structure;
extremely hard, very firm; common fine roots;
common worm casts; common fine concretions of
calcium carbonate; calcareous; moderately alkaline;
gradual wavy boundary.
AC1-16 to 28 inches; olive (5Y 5/4) clay, olive (5Y 4/4)
moist; common fine distinct light olive brown (2.5Y
5/4) mottles; moderate very fine to medium blocky
structure; a few intersecting slickensides; extremely
hard, very firm; common fine roots; 5 percent, by
volume, soft masses of calcium carbonate; few
worm casts; calcareous; moderately alkaline; gradual
wavy boundary.
AC2-28 to 41 inches; light brownish gray (2.5Y 6/2)
clay; many medium distinct light olive brown (2.5Y
5/4) mottles; weak fine to coarse angular blocky
structure; extremely hard, very firm; few roots;
common fine seams and pockets of calcium carbon-
ate; few worm casts; vertical cracks are 1/8 inch
wide at a depth of 40 inches; calcareous; moderate-
ly alkaline; clear smooth boundary.
C-41 to 72 inches; mottled light olive brown (2.5Y 5/4),
light brownish gray (2.5Y 6/2), and gray (10YR 5/1)shaly clay; light yellowish brown (2.5Y 6/4), rubbed;
moderate fine to coarse platy structure; extremely
hard, very firm; few fine roots between some peds;
few clay balls; few pockets of calcium carbonate;
calcareous; moderately alkaline.
The solum is 30 to 60 inches thick. The soil generally
has open cracks more than 20 inches deep in summer.
The soil is calcareous throughout.
When the soil is dry, the A horizon is grayish brown,
brown, light yellowish brown, light olive brown, olive
brown, olive gray, or olive. Where the color value is less
than 3.5 when the soil is dry, the horizon is less than 12
inches thick or makes up less than half of the pedon.
The AC horizon is olive, olive gray, light olive brown, or
light brownish gray. In some pedons, it has mottles in
shades of brown, gray, yellow, or olive.
The C horizon is weathered shaly clay or shale. The
gray colors are derived from the shale. In most pedons,
the C horizon has concretions or soft masses of calcium
carbonate. In some pedons, there are gypsum crystals in
the AC and C horizons.
Frio series
The Frio series is made up of deep, well drained,
clayey soils. Frio soils formed in recent alluvium on flood
plains. The slopes are 0 to 2 percent.
Typical pedon of Frio silty clay, frequently flooded;
from the intersection of Dallas-Forth Worth Turnpike and
Belt Line Road in Grand Prairie, this pedon is located
1,750 feet north on Belt Line Road, 3,500 feet east on
county road, and 2,700 feet east in a pasture:
Ap-0 to 7 inches; dark grayish brown (10YR 4/2) silty
clay, very dark grayish brown (10YR 3/2) moist;
moderate fine subangular blocky structure; very
hard, friable; common fine and medium roots;
common worm casts; calcareous; moderately alka-
line; gradual smooth boundary.
A12-7 to 32 inches; very dark grayish brown (10YR
3/2) silty clay, very dark grayish brown (10YR 3/2)
moist; strong very fine and fine subangular blocky
structure; very hard, friable; common fine roots;
cracks are common throughout when the soil is dry;
common fine fragments of limestone; common worm
casts; calcareous; moderately alkaline; gradual
smooth boundary.
A13-32 to 53 inches; very dark grayish brown (10YR
3/2) silty clay, very dark grayish brown (10YR 3/2)
moist; moderate fine and medium subangular blocky
structure; very hard, friable; common fine roots; few
fine fragments of limestone; common worm casts;
calcareous; moderately alkaline; gradual wavy
boundary.
Cca-53 to 74 inches; brown (10YR 5/3) silty clay loam;
moderate fine blocky structure; hard, friable; few'fine
roots; common fine threads and seams of calcium60
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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/m1/70/?q=tex-land: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.