\<@37\>Dowling Series

\<@33\>\<i\>*Major Land Resource Area:*\<p\> 131---Southern Mississippi
Valley Alluvium

\<@33\>\<i\>*Local physiographic area:*\<p\> Channel fill and swales of
point-bar deposits

\<@33\>\<i\>*Geomorphic setting:*\<p\> Meander scars on alluvial plains

\<@33\>\<i\>*Parent material:*\<p\> Clayey alluvium

\<@33\>\<i\>*Geology:*\<p\> Alluvial flood plains

\<@33\>\<i\>*Drainage class:*\<p\> Very poorly drained

\<@33\>\<i\>*Permeability class:*\<p\> Impermeable

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

\<@33\>\<i\>*Shrink-swell potential:*\<p\> Very high

\<@33\>\<i\>*Slope:*\<p\> 0 to 1 percent

\<@33\>\<i\>*Taxonomic classification:*\<p\> Very-fine, smectitic,
nonacid, thermic Vertic Endoaquepts

\<@27\>Associated Soils

\<@30\>The Dowling series is commonly associated with Sharkey soils.

-   \<@49\>The Sharkey soils form cracks when dry.

\<@27\>Typical Pedon

\<@25\>Dowling clay, 0 to 1 percent slopes, frequently flooded; in a
swamp; 9.4 miles south on U.S. Highway 65 from Newellton, 7.8 miles
northwest on State Highway 128, about 3.5 miles southwest on State
Highway 573, about 5.62 miles west on Crooked Bayou Road, 3,200 feet
northwest on a field road, and 100 feet northeast of the road in an
oxbow depression; SW1/4SW1/4NE1/4 sec. 29, T. 12 N., R. 10 E.; Gretna
Green, Louisiana, USGS 7.5-minute quadrangle; lat. 31 degrees, 59
minutes, 32.49 seconds north and long. 91 degrees, 28 minutes, 1.07
seconds west.

\<@23\>A---0 to 4 inches; very dark grayish brown (10YR 3/2) clay;
massive; very firm, very sticky and very plastic; many fine and medium
roots; 15 percent medium distinct irregular yellowish brown (10YR 5/4)
masses of oxidized iron throughout; 1 percent wood fragments; strongly
acid; clear smooth boundary.

\<@33\>Bg1---4 to 18 inches; gray (5Y 5/1) clay; weak medium subangular
blocky structure; very firm, very sticky and very plastic; many fine
roots throughout; 35 percent medium and coarse prominent irregular
strong brown (7.5YR 5/6 and 5/8) masses of oxidized iron throughout; 1
percent wood fragments; slightly acid; gradual smooth boundary.

\<@33\>Bg2---18 to 31 inches; greenish gray (5GY 5/1) clay; weak medium
subangular blocky structure; very firm, very sticky and very plastic;
many fine roots throughout; 35 percent medium and coarse prominent
irregular strong brown (7.5YR 5/6 and 5/8) masses of oxidized iron
throughout; 1 percent wood fragments; slightly acid; gradual smooth
boundary.

\<@33\>BCg---31 to 80 inches; gray (5Y 5/1) clay; weak fine subangular
blocky structure; very firm, very sticky and very plastic; 2 percent
faint pressure faces on all faces of peds; 15 percent medium distinct
irregular dark yellowish brown (10YR 4/4) masses of oxidized iron; 1
percent fine distinct threadlike light gray (10YR 7/1) masses of barite;
1 percent wood fragments; neutral.

\<@27\>Range in Characteristics

\<@33\>\<i\>*Thickness of the solum:*\<p\> 40 to more than 80 inches

\<@33\>\<i\>*Content of clay in the control section:*\<p\> More than 60
percent

\<@33\>\<i\>*Redoximorphic features:*\<p\> Iron accumulations throughout

\<@33\>\<i\>*Other distinctive features:*\<p\> COLE of 0.09 to 0.18 in
all mineral layers; no crack formation in the upper part of the subsoil
in normal years; slickensides below a depth of 40 inches in some pedons;
wood fragments throughout

\<@33\>\<i\>*Concentrated minerals:*\<p\> Masses of barite in the lower
part of the subsoil

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

\<@31\>Color---hue of 10YR to 5Y, value of 3 or 4, and chroma of 1 or 2;
or neutral in hue and value of 4

\<@31\>Redoximorphic features---iron accumulations in shades of yellow
to brown

\<@31\>Texture---clay

\<@31\>Other distinctive features---n-value of less than 0.7

\<@31\>Reaction---strongly acid to neutral

\<@31\>Thickness---3 to 8 inches

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

\<@31\>Color---dominantly hue of 10YR to 5GY, value of 4 or 5, and
chroma of 1 or neutral in hue and value of 4 or 5; value of 6 in the
lower part in some pedons

\<@31\>Redoximorphic features---the number of masses of iron
accumulation in shades of brown ranges from none to common.

\<@31\>Texture---clay

\<@31\>Other distinctive features---n-value of less than 0.7

\<@31\>Reaction---slightly acid to moderately alkaline

\<@31\>Thickness---more than 25 inches

\<@23\>\<i\>*BCg horizon: (where present)*\<p\>

\<@31\>Color---hue of 2.5Y to 5BG, value of 4 to 6, and chroma of 1; or
neutral in hue and value of 4 to 6

\<@31\>Redoximorphic features---iron accumulations in shades of yellow
to brown

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

\<@31\>Other distinctive features---n-value of less than 0.7; content of
organic carbon decreases irregularly with depth and/or is more than 0.2
percent at a depth of 50 inches

\<@31\>Reaction---neutral to moderately alkaline

\<@31\>Thickness---0 to 48 inches

\<@23\>\<i\>*C horizon: (where present)*\<p\>

\<@31\>Color---hue of 5Y to 5BG, value of 4 to 6, and chroma of 1; or
neutral in hue and value of 4 to 6

\<@31\>Redoximorphic features---iron accumulations in shades of yellow
to brown

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

\<@31\>Other distinctive features---n-value ranging from 0.7 to 1.0 in
some pedons

\<@31\>Reaction---neutral to moderately alkaline

\<@31\>Thickness---0 to 51 inches