McLaurin Series

\<@32\>The McLaurin series consists of very deep, well drained soils
that formed in loamy sediments. These soils are on broad ridgetops in
the uplands in the southwestern part of the county. Slopes range from 2
to 5 percent. These soils are coarse-loamy, siliceous, subactive,
thermic Typic Paleudults.

\<@32\>McLaurin soils are geographically associated with Boykin,
Luverne, Smithdale, and Wadley soils. Boykin and Wadley soils are in
positions similar to those of the McLaurin soils but at slightly higher
elevations or on the lower side slopes. They have a thick, sandy
epipedon. Luverne and Smithdale soils are commonly in the lower
positions on side slopes. Luverne soils have a clayey argillic horizon.
Smithdale soils are fine-loamy and do not have a bisequual profile.

\<@32\>Typical pedon of McLaurin fine sandy loam, 2 to 5 percent slopes;
about 1.5 miles east of Aquilla; 1,200 feet south and 2,400 feet west of
the northeast corner of sec. 33, T. 9 N., R. 4 W.

\<@23\>Ap1---0 to 2 inches; dark grayish brown (10YR 4/2) fine sandy
loam; weak fine granular structure; very friable; common fine, medium,
and coarse roots; very strongly acid; clear smooth boundary.

\<@33\>Ap2---2 to 6 inches; dark brown (10YR 4/3) fine sandy loam; weak
medium subangular blocky structure; very friable; common fine and medium
roots; very strongly acid; clear smooth boundary.

\<@33\>Ap3---6 to 9 inches; dark yellowish brown (10YR 4/4) fine sandy
loam; weak coarse subangular blocky structure; very friable; common fine
and medium roots; common spots of strong brown (7.5YR 5/6) fine sandy
loam; very strongly acid; clear wavy boundary.

\<@33\>Bt1---9 to 14 inches; yellowish red (5YR 4/6) fine sandy loam;
weak coarse subangular blocky structure; very friable; common fine and
few medium roots; sand grains coated and bridged with clay; few faint
clay films in pores and root channels; very strongly acid; clear wavy
boundary.

\<@33\>Bt2---14 to 22 inches; red (2.5YR 4/6) loam; moderate coarse
subangular blocky structure; friable; common fine and few medium roots;
few faint clay films on faces of peds and lining root channels and
pores; very strongly acid; clear wavy boundary.

\<@33\>Bt3---22 to 36 inches; yellowish red (5YR 4/6) fine sandy loam;
weak medium subangular blocky structure; friable; few fine and medium
roots; few faint clay films on faces of peds; sand grains coated and
bridged with clay; very strongly acid; clear wavy boundary.

\<@33\>B/E---36 to 48 inches; 85 percent yellowish red (5YR 5/6) fine
sandy loam (B); weak coarse subangular blocky structure; very friable;
15 percent light brown (7.5YR 6/4) loamy fine sand (E); massive; very
friable; very strongly acid; clear wavy boundary.

\<@33\>B´t---48 to 80 inches; yellowish red (5YR 5/8) sandy loam; weak
coarse subangular blocky structure; very friable; sand grains coated and
bridged with clay; very strongly acid.

\<@8\>The solum is more than 60 inches thick. Reaction is very strongly
acid or strongly acid throughout the profile, except where the surface
layer has been limed.

\<@32\>The Ap or A horizon has hue of 7.5YR or 10YR, value of 3 to 5,
and chroma of 2 to 4.

\<@32\>The E horizon, if it occurs, has hue of 10YR, value of 4 to 6,
and chroma of 3 to 6. The texture is commonly sandy loam or fine sandy
loam. Less commonly, it is loamy fine sand.

\<@32\>The Bt horizon has hue of 2.5YR or 5YR, value of 4 or 5, and
chroma of 4 to 8. It is sandy loam, fine sandy loam, or loam.

\<@32\>The B part of the B/E horizon has the same range in color as the
Bt horizon. It is fine sandy loam or sandy loam. The E part has hue of
7.5YR or 10YR, value of 6 to 8, and chroma of 3 to 6. It is loamy sand
or loamy fine sand.

\<@32\>The B´t horizon has hue of 10R to 5YR, value of 4 or 5, and
chroma of 6 to 8. In some pedons it has relic redoximorphic
accumulations in shades of red, brown, and yellow. The texture is sandy
loam or sandy clay loam.