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| <p><strong><em>Locust Series</em></strong></p> |
| <p>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.</p> |
| <p>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.</p> |
| <p>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)</p> |
| <p>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)</p> |
| <p>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)</p> |
| <p>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)</p> |
| <p>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)</p> |
| <p>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)</p> |
| <p>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.</p> |
| <p>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.</p> |
| <p>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.</p> |
| <p>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.</p> |
| <p>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.</p> |
| <p>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.</p> |
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