Soil Survey of Concho County, Texas Page: 51
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Concho County, Texas
A-0 to 8 inches; dark brown (10YR 4/3) gravelly loam,
dark brown (10YR 3/3) moist; weak fine granular
and fine subangular blocky structure; slightly hard,
friable, slightly sticky and slightly plastic; many fine
roots; few fine pores; about 2 percent small caliche
fragments on the surface and 15 percent in horizon;
calcareous, moderately alkaline; abrupt wavy
boundary.
Bkm-8 to 17 inches; pink (7.5YR 8/4) indurated
caliche, fractured into plates about 8 inches across
and 1 inch to 2 inches thick; about 5 percent brown
loam in cracks of upper part; clear wavy boundary.
Ck-17 to 60 inches; pink (7.5YR 8/4) loamy calcareous
earth; massive; hard, friable; estimated more than 50
percent, by volume, calcium carbonate; about 30
percent weakly cemented calcium carbonate
concretions; few hard cemented fragments;
moderately alkaline.
The solum ranges in thickness from 7 to 20 inches
and corresponds to the depth to the strongly cemented
or indurated caliche horizon.
The A horizon is brown, dark brown, grayish brown,
dark grayish brown, or very dark grayish brown. The
texture of the fine earth fraction is loam or clay loam.
Gravel and channers of caliche make up 5 to 30
percent, by volume; and cobbles and flagstones of
caliche make up 0 to about 14 percent, by volume (fig.
10). Calcium carbonate equivalent of the soil that is less
than 2 centimeters in size ranges from 40 to 65 percent.
Calcium carbonate equivalent of the fine earth fraction
ranges from 20 to 40 percent.
The Bkm horizon is platy or massive. It is 2 to 12
inches thick.
The Ck horizon ranges from pinkish white and very
pale brown to pink. The texture of the fine earth fraction
is loam or clay loam. Caliche and limestone gravel are 2
to about 35 percent, by volume. Thickness ranges from
a few to several feet.
Dev Series
The Dev series consists of deep, well drained,
moderately rapidly permeable soils. These soils are on
nearly level and gently sloping flood plains. The soils
formed in calcareous, loamy and gravelly alluvial
sediment. Slopes range from 0.5 to about 3 percent. The
soils of the Dev series are loamy-skeletal, carbonatic,
thermic Cumulic Haplustolls.
Typical pedon of Dev gravelly loam, frequently
flooded; 5.4 miles west of the courthouse in Paint Rock
on Farm Road 380, 2 miles south on a county road, 1.6
miles east on a county road, in road cut on northeast
bank of creek:
A1--0 to 10 inches; dark grayish brown (10YR 4/2)
gravelly loam, very dark grayish brown (10YR 3/2)
moist; weak very fine subangular blocky and'-P4
. /A"r
Figure 1O.-Cho gravelly clay loam, undulating, has a petrocalcic
horizon (platy cemented caliche) at a depth of about 7 inches.
The caliche material is used locally in the construction of
roadbeds.
granular structure; hard, friable; many fine roots;
common worm casts; 15 percent, by volume,
rounded limestone gravel; calcareous, moderately
alkaline; clear smooth boundary.
A2-10 to 24 inches; dark grayish brown (10YR 4/2)
extremely gravelly loam, very dark grayish brown
(10YR 3/2) moist; weak very fine subangular blocky
and granular structure; hard, friable; few fine and51
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General Soil Map, Concho 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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Clower, Dennis F. Soil Survey of Concho County, Texas, book, 1988; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth130209/m1/61/?q=tex-land&rotate=90: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.