Locust Series

\<@32\>The Locust series consists of deep, moderately well drained,
slowly permeable soils that formed in colluvium and alluvium derived
from sandstone, shale, quartzite, and chert. These soils are on uplands
in the Appalachian Plateau and Limestone Valleys. Slopes are 0 to 10
percent. These soils are fine-loamy, mixed, semiactive, thermic Glossic
Fragiudults.

\<@32\>Typical pedon of Locust silt loam in an idle area in Talladega
County, Alabama; 7 miles west of Talladega and 1 mile south of Jonesview
School, 100 feet north of a gravel road; SW1/4SE1/4 sec. 28, T. 12 S.,
R. 4 E.

\<@23\>Ap---0 to 8 inches; brown (10YR 4/3) silt loam; weak fine
granular structure; friable; many fine roots; few wormcasts; few pebbles
of quartzite; strongly acid; abrupt smooth boundary. (4 to 10 inches
thick)

\<@33\>Bt---8 to 24 inches; olive yellow (2.5Y 6/6), crushed and
uncrushed, clay loam; weak medium subangular blocky structure; friable;
common fine roots; very thin patchy clay films on faces of peds; few
soft strong brown bodies; common pebbles of quartzite; old root channels
filled with material from the Ap horizon; very strongly acid; clear wavy
boundary. (12 to 26 inches thick)

\<@33\>Btx/E---24 to 28 inches; olive yellow (2.5Y 6/6) clay loam; many
medium faint light yellowish brown (2.5Y 6/4) and common medium distinct
gray (5Y 6/1) mottles; weak thick platy structure parting to moderate
medium subangular blocky; firm, slightly compact and brittle in place;
common thin patchy clay films on faces of peds; few fine roots; few
vesicular pores lined with clay; very strongly acid; gradual irregular
boundary. (1 to 6 inches thick)

\<@33\>Btx1---28 to 39 inches; distinctly mottled light olive gray (5Y
6/2), light yellowish brown (2.5Y 6/4), olive yellow (2.5Y 6/6), and
gray (6Y 6/1) clay loam; weak coarse polyhedrons parting to moderate
medium subangular blocky structure; hard, firm, compact and brittle;
many thin patchy clay films on faces of peds; common vesicles lined with
clay; few black concretions; grayer areas are polygonal cracks
surrounding the more yellow and brown prisms; roots concentrated in gray
cracks; few small pebbles; strongly acid; gradual irregular boundary.
(10 to 20 inches thick)

\<@33\>Btx2---39 to 51 inches; distinctly mottled light yellowish brown
(2.5Y 6/4), olive yellow (2.5Y 6/6), and gray (5Y 6/1) loam; weak coarse
polyhedrons parting to moderate medium blocky structure; hard, firm,
very compact and brittle; many thin patchy clay films on faces of peds;
common vesicles lined with clay; few black concretions; few small
pebbles; very strongly acid; clear irregular boundary. (10 to 20 inches
thick)

\<@33\>Btx3---51 to 64 inches; coarsely mottled light olive gray (5Y
6/2), light yellowish brown (2.5Y 6/4), and brownish yellow (10YR 6/8)
gravelly sandy loam; moderate medium blocky structure; firm, compact in
place, brittle; few thin patchy clay films on faces of peds; many fine
black concretions; few fragments of sandstone and shale; common pebbles
of quartzite and chert; very strongly acid; clear irregular boundary.
(10 to 20 inches thick)

\<@33\>C---64 to 70 inches; coarsely mottled light yellowish brown (10YR
6/4) and brownish yellow (10YR 6/8) cherty sandy loam; massive; many
fragments and pebbles of sandstone, shale, chert, and quartzite;
extremely difficult to dig with hand tools; few black concretions; very
strongly acid.

\<@8\>The solum is more than 4 feet thick. Depth to bedrock is more than
5 feet. Depth to a fragipan ranges from 16 to 30 inches. Pebbles or
fragments of sandstone, shale, quartzite, and chert are present in some
pedons. The content of pebbles and fragments is less than 15 percent in
individual horizons, except for in the C horizon, where it can be up to
60 percent. The content of small, soft, brown and black bodies ranges
from few to many throughout the pedon. Reaction is strongly acid or very
strongly acid, except for the Ap horizon where lime has been applied.

\<@32\>The Ap horizon has hue of 10YR to 2.5Y, value of 4 to 6, and
chroma of 1 to 4. It is loam, fine sandy loam, or silt loam or the
gravelly analogs of those textures.

\<@32\>The Bt horizon has hue of 10YR or 2.5Y, value of 4 to 6, and
chroma of 4 to 8. It loam, sandy clay loam, silt loam, or clay loam. It
has more than 20 percent silt and from 18 to 35 percent clay. Clay films
are not consistently visible on either vertical or horizontal ped faces.

\<@32\>The Btx horizon is distinctly or prominently mottled with shades
of gray, yellow, brown, or red. In some pedons, the hue of the matrix is
10YR or yellower. The texture is clay loam, loam, or sandy loam. The
content of clay ranges from 18 to 35 percent. The upper 6 inches of the
fragipan contains a discontinuous E horizon comprised mostly of clean,
light gray or gray sand grains.

\<@32\>The C horizon is mottled in shades of gray, brown, yellow, and
red. In the fine-earth fraction, it is clay loam, sandy loam, or loam.