LOCATION MCLAURIN MS+AL AR LA VA
Established Series
Rev. RED: WMK: RBH; GRB
03/2014
MCLAURIN SERIES
The McLaurin series consists of very deep, well drained, moderately permeable soils on dissected fluviomarine terraces of the Southern Coastal Plain Major Land Resource Area (MLRA 133A). They formed in loamy marine or stream sediments. Near the type location, the mean annual temperature is about 64 degrees, F., and the average annual precipitation is about 61 inches. Slopes range from 0 to 8 percent.
TAXONOMIC CLASS: Coarse-loamy, siliceous, subactive, thermic Typic Paleudults
TYPICAL PEDON: McLaurin loamy sand, in a forested area (Colors are for moist soil unless otherwise stated).
A--0 to 5 inches; very dark grayish brown (10YR 3/2) loamy sand; weak fine and medium granular structure; very friable; strongly acid; clear smooth boundary. (3 to 9 inches thick)
E--5 to 8 inches; dark grayish brown (10YR 4/2) loamy sand; weak fine and medium granular structure; very friable; strongly acid; clear wavy boundary. (0 to 5 inches thick)
BE--8 to 14 inches; yellowish brown (10YR 5/4) sandy loam; weak fine granular structure; very friable; mixing in upper part by earthworm action; strongly acid; gradual wavy boundary. (0 to 10 inches thick)
Btl--14 to 20 inches; yellowish red (5YR 5/6) fine sandy loam; weak fine and medium subangular blocky structure; very friable; clay bridging of sand grains and few thin clay films on faces of peds; strongly acid; gradual wavy boundary.
Bt2--20 to 32 inches; yellowish red (5YR 4/6) fine sandy loam; weak medium to coarse subangular blocky structure; friable; clay bridging of sand grains and few thin clay films on faces of peds; strongly acid; diffuse wavy boundary.
Bt3--32 to 38 inches; yellowish red (5YR 4/6) sandy loam; weak coarse subangular blocky structure; very friable; clay bridging of sand grains; strongly acid; diffuse wavy boundary. (Combined thickness of the Bt subhorizons ranges from 18 to 40 inches.)
B/E--38 to 49 inches; yellowish red (5YR 4/6) loamy fine sand (B); with coarse subangular blocky structure; very friable; common fine roots; common fine pores; many fine reddish yellow (7.5YR 6/6) pockets of uncoated sand grains (E); very strongly acid; diffuse irregular boundary. (6 to 12 inches thick)
B't--49 to 60 inches; red (2.5YR 4/6) sandy clay loam, weak coarse subangular blocky structure; friable; sand grains coated and bridged with clay; very strongly acid.
TYPE LOCATION: Forrest County, Mississippi. Approximately 2.0 miles west of McLaurin, about 0.9 mile north of Lake Shelby and about 300 feet west of U.S. Highway 49. NW 1/4, NW 1/4, Sec. 6, T 2 N; R 12 W.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 inches to more than 80 inches. In some pedons a few ironstone fragments or chert gravel, or both make up less than 10 percent of the volume are present in some pedons. The Bt/E and the B't horizons are definitive for the series. The particle size control section has 10 to 18 percent clay and 20 to 50 percent silt. Reaction is strongly acid to very strongly acid throughout, except where the surface has been limed.
The A or Ap horizon has hue of 7.5YR or 10YR, value of 3 to 5 and chroma of 2 to 4, and chroma of 3 to 6. A value of 3 with chroma of 2 or less is limited to horizons with a thickness of less than 6 inches. Texture is loamy sand, loamy fine sand, sandy loam or fine sandy loam.
The E horizon, where present, has hue of 7.5YR or 10YR, value of 4 to 6, and chroma of 2 to 6. Texture is loamy sand, loamy fine sand, sandy loam or fine sandy loam.
The EB or BE horizon, where present, has hue of 5YR to 10YR, value of 4 to 6, and chroma of 4 to 8. Texture is loamy sand, loamy fine sand, sandy loam or fine sandy loam.
The Bt horizon has hue of 10R to 7.5YR, value of 4 or 5, and chroma of 4 to 8. Texture is sandy loam, fine sandy loam or loam.
The B part of the B/E horizon has the same range in color as the Bt horizon. Texture is loamy sand, sandy loam, or fine sandy loam. The E part of the material is almost stripped of clay. It has hue of 7.5YR or 10YR, value of 6 to 8, and chroma of 3 to 8, and makes up about 10 to 25 percent of the volume in a discontinuous pattern. Texture is sand, fine sand or loamy fine sand. Some pedons have an E/B horizon.
The B't horizon has hue of 10R to 5YR, value of 4 or 5, and chroma of 4 to 8. Texture is loam or sandy clay loam.
COMPETING SERIES: The
Heidel series is the only known soil in the same family. The
Benndale,
Butters and
Niwana series are in a closely related family. Heidel soils are on similar positions but do not have a bisequum. Benndale, Butters and Niwana soils are semiactive. In addition, Benndale and Niwana have yellower subsoils and Butters soils have less than 20 percent silt in the control section. Niwana soils are in the Western Coastal Plain MLRA (133B).
GEOGRAPHIC SETTING: McLaurin soils are on broad ridge tops and upper hillsides of ridges dividing major streams in the Southern Coastal Plain. Slopes range from 0 to 8 percent. They formed in loamy marine or stream deposits. The climate is humid subtropical. The mean annual temperature is 64 degrees Fahrenheit and the mean annual precipitation is 61 inches near the type location.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Benndale and
Heidel series and the
Eustis,
Lucedale,
Lucy,
Malbis,
Ora,
Poarch,
Ruston,
Smithdale,
Sweatman,
Troup and
Wadley series. The excessively drained Eustis soils are on similar to higher positions and have a sandy control section. Lucedale and Ruston soils are on similar positions but have a fine-loamy control section. In addition, Lucedale soils are rhodic. Lucy, Troup and Wadley soils are on similar to higher positions in more dissected parts of the landscape. In addition, Lucy soils have sandy surface and subsurface layers 20 to 40 inches thick while the excessively drained Troup and the well to somewhat excessively drained Wadley soils have sandy surface and subsurface layers 40 to 80 inches thick. The moderately well and well drained Malbis and Poarch soils are on similar to slightly higher positions, have yellower subsoils and are plinthic. In addition, Malbis soils have fine-loamy subsoils. The moderately well drained Ora soils are on slightly higher ridge tops and have a fragipan. Smithdale soils mainly are on adjacent hill sides and have fine-loamy control sections. Sweatman soils are on lower adjacent hill side positions and have clayey control sections.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow to medium; moderate permeability.
USE AND VEGETATION: Most areas of McLaurin soils have been cleared and are used for crops such as cotton, corn, soybeans and small grains. Many areas are used for pasture and woodland. The principal vegetation of wooded areas is longleaf pine, slash pine, loblolly pine and shortleaf pines. Some areas are composed of mixed hardwoods and pines with an understory of shrubs and grasses.
DISTRIBUTION AND EXTENT: Alabama, Arkansas, Louisiana and Mississippi. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Auburn, Alabama.
SERIES ESTABLISHED: Lamar County, Mississippi; 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Ochric epipedon - the zone from the surface to a depth of about 8 inches (A and E horizons).
Argillic horizon - the zone from approximately 8 to 60 inches (BE, Bt1, Bt2, Bt3, B/E and B't horizons).
McLaurin soils are in MLRA 133A.
ADDITIONAL DATA: Laboratory data is available on the National Soil Survey website at: http;://ncsslabdatamart.sc.egov.usda.gov/querypage.aspx
Laboratory data was provided by Auburn University, Soil Characterization laboratory, Auburn AL. and the National Soil Survey laboratory, Lincoln, NE.
Laboratory data: Chemical analyses, particle-size distribution, and engineering test data for the typical pedon are published in the Soil Survey of Forrest County, Mississippi (issued April 1979) pp. 101-102. Chemical analyses and particle-size distribution for one pedon are published in the Soil Survey of Lauderdale County, Mississippi (issued July 1983) pp. 135-136.
National Cooperative Soil Survey
U.S.A.