\<@37\>Sumter Series

\<@32\>The Sumter series consists of moderately deep, well drained soils
that formed in materials weathered from alkaline clays and soft
limestone (chalk). These soils are on side slopes in uplands of the
Blackland Prairie. Slopes range from 5 to 25 percent. These soils are
fine-silty, carbonatic, thermic Rendollic Eutrochrepts.

\<@32\>Sumter soils are commonly associated on the landscape with Hannon
soils. Hannon soils are in slightly higher positions than those of the
Sumter soils. They have a reddish argillic horizon and are acid in the
upper part of the subsoil.

\<@32\>Typical pedon of Sumter silty clay loam, in an area of
Sumter-Hannon complex, 12 to 25 percent slopes, severely eroded; about 5
miles south of Marvyn, 1,800 feet east and 2,000 feet north of the
southwest corner of sec. 12, T. 16 N., R. 26 E.

\<@23\>Ap---0 to 3 inches; very dark grayish brown (2.5Y 3/2) silty clay
loam; weak coarse granular structure; firm; many fine roots; common
fragments of fossil oyster shell; common fine soft masses of calcium
carbonate; strongly effervescent; moderately alkaline; clear wavy
boundary.

\<@33\>Bk1---3 to 21 inches; pale olive (5Y 6/4) silty clay loam;
moderate medium subangular blocky structure; firm; few fine and medium
roots; few fine fragments of soft limestone (chalk); many fine, medium,
and coarse soft masses of calcium carbonate; strongly effervescent;
moderately alkaline; gradual wavy boundary.

\<@33\>Bk2---21 to 28 inches; light olive brown (2.5Y 5/4) silty clay
loam; moderate medium subangular blocky structure; firm; few fine roots;
common fine fragments of soft limestone (chalk); few fossil oyster
shells; many fine, medium, and coarse soft masses of calcium carbonate;
strongly effervescent; moderately alkaline; clear wavy boundary.

\<@33\>Bk3---28 to 38 inches; light olive brown (2.5Y 5/6) silty clay
loam; moderate medium subangular blocky structure; firm; common fine
fragments of soft limestone (chalk); few fossil oyster shells; many
fine, medium, and coarse soft masses of calcium carbonate; common medium
distinct pale olive (5Y 6/3) iron depletions; strongly effervescent;
moderately alkaline; clear wavy boundary.

\<@33\>Cr---38 to 80 inches; weathered, soft limestone (chalk) bedrock;
massive; very firm; common thin strata of fossil oyster shell; violently
effervescent; moderately alkaline.

\<@8\>The thickness of the solum and depth to soft bedrock ranges from
20 to 40 inches. Reaction is slightly alkaline or moderately alkaline
throughout the profile.

\<@32\>The A horizon has hue of 10YR or 2.5Y, value of 3 or 4, and
chroma of 1 or 2. The texture is silty clay loam or silty clay.

\<@32\>The Bk horizon has hue of 2.5Y or 5Y, value of 4 to 7, and chroma
of 3 to 6. It has common or many soft masses or concretions or both of
calcium carbonate. The texture is silty clay loam, silty clay, or clay.

\<@32\>The Cr horizon is weathered, soft limestone (chalk) bedrock. It
is massive or has thick platy rock structure. It can be cut with
difficulty using hand tools and is rippable by heavy equipment. In most
pedons it has strata of fossil oyster shell. These strata range in
thickness from a few inches to a few feet.