Soil Survey of Limestone County, Texas Page: 86
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Soil Survey
percent fine and coarse siliceous pebbles; strongly
acid; clear smooth boundary.
Bt1-9 to 18 inches; reddish brown (2.5YR 4/4) clay,
reddish brown (2.5YR 5/4) dry; many medium
prominent dark yellowish brown (10YR 4/4) and
common medium distinct red (2.5YR 5/8) mottles;
moderate medium subangular blocky structure; very
hard, firm; about 2 percent fine and medium roots; thin
patchy clay films on faces of peds; few fine and coarse
siliceous pebbles; common streaks of dark grayish
brown coatings on peds along cracks; very strongly
acid; clear wavy boundary.
Bt2-18 to 32 inches; light olive brown (2.5Y 5/4) clay, light
yellowish brown (2.5Y 6/4) dry; few medium prominent
red (2.5YR 4/8) mottles; moderate medium subangular
blocky structure; very hard, firm; few fine and medium
roots; thin patchy clay films on faces of peds; few
pressure faces; about 2 percent fine and coarse
siliceous pebbles; few dark streaks in cracks; strongly
acid; clear smooth boundary.
Btk1l-32 to 43 inches; light yellowish brown (2.5Y 6/4)
clay, pale yellow (2.5Y 7/4) dry; moderate coarse
angular blocky structure; very hard, very firm; few fine
roots; thin patchy clay films on faces of peds; few fine
pressure faces; few fine and medium calcium
carbonate concretions and masses; 5 percent fine and
coarse siliceous pebbles; few brown organic root
stains; slightly effervescent; moderately alkaline;
gradual wavy boundary.
Btk2-43 to 60 inches; light yellowish brown (2.5Y 6/4)
clay, pale yellow (2.5Y 7/4) dry; few fine prominent
brownish yellow (10OYR 6/8) mottles; moderate coarse
angular blocky structure; extremely hard, very firm; few
fine roots; thin patchy clay films on faces of peds; few
pressure faces; common fine black concretions;
common fine and medium calcium carbonate
concretions and masses; few patches of neutral salts;
5 percent siliceous pebbles; few brown organic root
stains; strongly effervescent; moderately alkaline;
gradual wavy boundary.
Btk3-60 to 80 inches; light yellowish brown (2.5Y 6/4)
clay loam, pale yellow (2.5Y 7/4) dry; moderate
medium and coarse angular blocky structure; very
hard, firm; few fine roots; thin patchy clay films on
faces of peds; common fine and medium calcium
carbonate concretions and masses; few fine black
concretions; strongly effervescent; moderately
alkaline.
Solum thickness ranges from 60 to more than 80
inches. The boundary between the A and Bt horizon is
abrupt over subsoil crests and clear over subsoil troughs.
Depth to carbonates ranges from 30 to 60 inches in most
pedons. Base saturation in the upper part of the Bt horizon
ranges from 55 to 75 percent.The A horizon has a hue of 10YR, value of 4 to 6, and
chroma of 2 or 3. The E horizon, where present, is about 1
unit of value higher than the A horizon. Some pedons
contain as much as 5 percent, by volume, gravel on the
surface and in the A horizon. The combined thickness of
the A and E horizons ranges from 5 to 12 inches. Reaction
ranges from strongly acid to slightly acid.
The Btl horizon has a hue of 2.5YR or 5YR, value of 4
to 6, and chroma of 4 to 8. Mottles in shades of red,
brown, gray, or yellow are in most pedons or the matrix is
mottled with these colors. Reaction is very strongly acid or
strongly acid.
The Bt2 horizon has a hue of 10YR or 2.5Y, value of 4
to 6, and chroma of 2 to 8. Mottles in shades of red,
brown, gray, or yellow are in most pedons or the matrix is
mottled with these colors. Reaction ranges from strongly
acid to slightly acid.
The Btk and BC horizons, where present, have a hue of
10OYR or 2.5Y, value of 5 to 7, and chroma of 2 to 4.
Mottles in shades of red, brown, gray, or yellow are in most
pedons or the matrix is mottled with these colors. The
texture is sandy clay loam, clay loam, or clay. The reaction
ranges from neutral to moderately alkaline. Calcium
carbonate concretions or masses range from none to few
in the BC horizon and few to common in the Btk horizon.
Branyon Series
The Branyon series consists of very deep, moderately
well drained, very slowly permeable soils on ancient
stream terraces. These soils formed in calcareous clayey
sediments. Slopes range from 0 to 2 percent. Soils of the
Branyon series are fine, montmorillonitic, thermic Udic
Haplusterts.
Typical pedon of Branyon clay, 0 to 2 percent slopes;
from the intersection of Texas Highway 171 and Farm
Road 73 in Coolidge, 7.5 miles west on Farm Road 73, 2.3
miles northwest on Farm Road 341, and 150 feet west, in
cropland:
Ap-0 to 6 inches; very dark gray (10OYR 3/1) clay, dark
gray (10YR 4/1) dry; moderate fine granular structure;
extremely hard, very firm, very sticky and very plastic;
few fine and medium roots; few pressure faces; few
fine and medium calcium carbonate concretions; about
2 percent rounded siliceous pebbles; strongly
effervescent; moderately alkaline; abrupt wavy
boundary.
Bss-6 to 14 inches; very dark gray (10YR 3/1) clay, dark
gray (10YR 4/1) dry; moderate medium angular blocky
structure; extremely hard, very firm, very sticky and
very plastic; few fine roots; few pressure faces;
common coarse intersecting slickensides; few fine and
medium calcium carbonate concretions; few fine black
concretions; about 2 percent siliceous pebbles;86
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General Soil Map, Limestone 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 1:253,440
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Griffin, Edward L.; Sabo, Donald J.; Brezina, Dennis N. & Janak, Edward L. Soil Survey of Limestone County, Texas, book, 1997; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth130231/m1/89/?q=tex-land: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.