Okolona Series

\<@33\>\<i\>*Depth class:*\<p\> Very deep

\<@33\>\<i\>*Drainage class:*\<p\> Moderately well drained

\<@33\>\<i\>*Permeability:*\<p\> Very slow

\<@33\>\<i\>*Parent material:*\<p\> Clayey residuum weathered from chalk

\<@33\>\<i\>*Landform:*\<p\> Broad ridges

\<@33\>\<i\>*Landform position:*\<p\> Summits and shoulder slopes

\<@33\>\<i\>*Slope:*\<p\> 0 to 3 percent

\<@33\>\<i\>*Taxonomic class:*\<p\> Fine, smectitic, thermic Oxyaquic
Hapluderts

\<@27\>Commonly Associated Soils

\<@30\>Demopolis, Faunsdale, Sucarnoochee, Sumter, and Vaiden soils are
commonly associated with the Okolona series.

-   \<@49\>The shallow Demopolis soils and moderately deep Sumter soils
    are generally in slightly higher positions than those of the Okolona
    soils.

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-   \<@29\>The somewhat poorly drained Faunsdale soils are in slightly
    lower, more concave positions than those of the Okolona soils.

-   \<@29\>The somewhat poorly drained Sucarnoochee soils are on flood
    plains.

-   \<@29\>The somewhat poorly drained Vaiden soils are in slightly
    lower positions than those of the Okolona soils and are acid in the
    upper part of the profile.

\<@27\>Typical Pedon

\<@30\>Typical pedon of Okolona silty clay loam, 0 to 3 percent slopes;
about 3.5 miles southwest of Casemore; 1,500 feet east and 100 feet
south of the northwest corner of sec. 13, T. 18 N., R. 3 E.; USGS
Casemore topographic quadrangle; 32 degrees 32 minutes 16 seconds N. and
long. 87 degrees 44 minutes 26 seconds W.

\<@23\>Ap---0 to 5 inches; dark olive gray (5Y 3/2) silty clay loam;
moderate medium subangular blocky structure; firm; many fine and medium
roots; few concretions of calcium carbonate; slightly effervescent;
slightly alkaline; abrupt smooth boundary.

\<@33\>A---5 to 18 inches; dark olive gray (5Y 3/2) clay; moderate
coarse subangular blocky structure parting to strong fine and medium
angular blocky; firm; common fine roots; few fine and medium concretions
of calcium carbonate; few fine concretions of iron and manganese oxides;
common medium faint very dark grayish brown (2.5Y 4/2) iron depletions
in pores; slightly effervescent; slightly alkaline; clear wavy boundary.

\<@33\>Bkss1---18 to 24 inches; dark grayish brown (2.5Y 4/2) clay;
moderate very coarse angular blocky structure parting to strong fine and
medium angular blocky; very firm; few fine roots; common large
intersecting slickensides that have distinct polished and grooved
surfaces; common medium concretions of calcium carbonate; few fine
concretions of iron and manganese oxides; few fine distinct light olive
brown (2.5Y 5/4) masses of iron accumulation on faces of peds; slightly
effervescent; moderately alkaline; gradual wavy boundary.

\<@33\>Bkss2---24 to 53 inches; dark grayish brown (2.5Y 4/2) clay;
moderate very coarse angular blocky structure parting to strong fine and
medium angular blocky; very firm; many large intersecting slickensides
that have prominent polished and grooved surfaces; many medium
concretions of calcium carbonate; few fine concretions of iron and
manganese oxides; common medium distinct light olive brown (2.5Y 5/4)
masses of iron accumulation; slightly effervescent; moderately alkaline;
gradual wavy boundary.

\<@33\>Bkss3---53 to 66 inches; light olive brown (2.5Y 5/4) clay;
moderate very coarse angular blocky structure parting to strong fine and
medium angular blocky; very firm; many large intersecting slickensides
that have prominent polished and grooved surfaces; many medium
concretions of calcium carbonate; few soft white masses of calcium
carbonate; common fine concretions and soft black masses of iron and
manganese oxides; common medium faint light olive brown (2.5Y 5/6)
masses of iron accumulation; common medium faint dark grayish brown
(2.5Y 4/2) iron depletions; moderately effervescent; moderately
alkaline; gradual wavy boundary.

\<@33\>Bkss4---66 to 76 inches; light olive brown (2.5Y 5/4) clay;
moderate very coarse angular blocky structure parting to strong medium
angular blocky; very firm; many large intersecting slickensides that
have prominent polished and grooved surfaces; many medium concretions of
calcium carbonate; common soft white masses of calcium carbonate; common
fine concretions and soft black masses of iron and manganese oxides;
common medium distinct yellowish brown (10YR 5/6) masses of iron
accumulation; common medium distinct gray (2.5Y 5/1) iron depletions;
strongly effervescent; moderately alkaline; gradual wavy boundary.

\<@33\>C---76 to 85 inches; light gray (2.5Y 7/2) clay; massive; very
firm; many large intersecting slickensides that have prominent polished
and grooved surfaces; many medium concretions of calcium carbonate;
common soft white masses of calcium carbonate; many fine concretions and
soft black masses of iron and manganese oxides; common medium distinct
light olive brown (2.5Y 5/6) masses of iron accumulation; strongly
effervescent; moderately alkaline.

\<@27\>Range in Characteristics

\<@33\>\<i\>*Thickness of the solum:*\<p\> More than 40 inches

\<@33\>\<i\>*Depth to bedrock:*\<p\> More than 60 inches to chalk

\<@33\>\<i\>*Reaction:*\<p\> Slightly alkaline or moderately alkaline
throughout the profile

\<@23\>\<i\>*Ap and A horizons:*\<p\>

\<@31\>Color---hue of 10YR to 5Y, value of 2 or 3, and chroma of 2 or 3

\<@31\>Texture---silty clay loam, silty clay, or clay

\<@23\>\<i\>*Bkss or Bss horizon:*\<p\>

\<@31\>Color---hue of 2.5Y or 5Y, value of 4 or 5, and chroma of 2 to 4

\<@31\>Texture---silty clay or clay

\<@31\>Redoximorphic features---few or common iron depletions in shades
of brown or gray and masses of iron accumulation in shades of brown or
olive; few to many soft masses and/or concretions of iron and manganese
oxides

\<@23\>\<i\>*C horizon:*\<p\>

\<@31\>Color---hue of 2.5Y or 5Y, value of 4 to 7, and chroma of 2 to 4

\<@31\>Texture---silty clay, clay, or silty clay loam

\<@31\>Redoximorphic features---few to many iron depletions in shades of
gray or brown and masses of iron accumulation in shades of brown or
olive; common or many soft masses and/or concretions of iron and
manganese oxides