LOCATION MAUMELLE ARTentative Series
TAXONOMIC CLASS: Fine-silty, mixed, semiactive, thermic Typic Paleaquults
TYPICAL PEDON: Maumelle silt loam, 0 to 1 percent slopes, ponded.
(Colors are for moist soil unless otherwise stated.)
A--0 to 2 inches; grayish brown (10YR 5/2) silt loam; weak medium and coarse subangular blocky structure parting to moderate fine granular; friable; many fine and few medium roots; common fine pores; few medium prominent reddish brown (5YR 4/4) masses of iron accumulation on subangular blocky ped faces and lining most pores; few fine and medium black (10YR 2/1) masses of manganese accumulation in matrix; extremely acid; clear smooth boundary.
Ag--2 to 7 inches; gray (10YR 5/1) silt loam; weak medium subangular blocky structure; friable; common fine, common medium and few coarse roots; common fine pores; common fine prominent yellowish red (5YR 4/6) masses of iron accumulation lining pores, root channels and faces of some peds; few medium prominent strong brown (7.5YR 5/6) masses of iron accumulation in matrix; few fine prominent dark reddish brown (2.5YR 3/4) masses of iron accumulation lining some pores; few fine and medium black (10YR 2/1) masses of manganese accumulation in matrix; extremely acid; clear smooth boundary.
Btg1--7 to 18 inches; grayish brown (2.5Y 5/2) silty clay loam; weak coarse subangular blocky structure; friable; few fine, few medium and few coarse roots; common fine, few medium pores; common distinct dark yellowish brown (10YR 4/6) clay films on faces of peds and on surfaces along some pores; few coarse distinct dark brown (10YR 3/3) masses of iron and manganese accumulation on faces of peds; common coarse prominent dark red (2.5YR 3/6) masses of iron accumulation on faces of peds and lining a few pores; few medium prominent strong brown (7.5YR 4/6) masses of iron accumulation in matrix and lining pores; few fine and medium black (10YR 2/1) masses of manganese accumulation on faces of peds; extremely acid; clear smooth boundary.
Btg2--18 to 29 inches; gray (10YR 5/1) silt loam; weak medium and coarse subangular blocky structure; friable; common fine and few medium roots; common fine, few medium and few coarse pores; common distinct dusky red (10R 3/3) clay films on some faces of peds and on surfaces along some pores and few prominent dark reddish brown (2.5YR 3/4) clay films on faces of peds and on surfaces along some pores; many coarse and very coarse prominent yellowish red (5YR 4/6) masses of iron accumulation on faces of peds and lining pores; common coarse prominent strong brown (7.5YR 4/6) masses of iron accumulation on faces of peds; few fine and medium black (10YR 2/1) masses of manganese accumulation on faces of peds; extremely acid; clear smooth boundary.
Btg3--29 to 38 inches; gray (2.5Y 6/1) silty clay loam; moderate medium and coarse columnar structure parting to moderate fine and medium subangular blocky structure; firm; few fine and few medium roots; few fine pores; many prominant dark red (10R 3/6) clay films on surfaces along pores and distinct dusky red (10R 3/3) clay films on faces of peds; common coarse prominent dusky red (10R 3/3) masses of iron accumulation on faces columns and faces of peds and lining some pores; common coarse prominent red (2.5YR 4/8) masses of iron accumulation primarily on faces of columns; few fine and medium prominent strong brown (7.5YR 5/6) masses of iron accumulation on faces of peds; few medium black (10YR 2/1) masses of manganese accumulation on faces of columns and peds and lining some pores and root channels; few fine and medium black (10YR 2/1) masses of manganese accumulation in matrix; few crayfish burrow up to 3 inches in diameter filled with gray (10YR 6/1) silt loam; extremely acid; gradual wavy boundary.
Btg4--38 to 49 inches; light brownish gray (2.5Y 6/2) silty clay loam; weak medium and coarse columnar structure parting to moderate medium and coarse subangular blocky structure; firm; few fine and few medium roots; few fine pores; common distinct dark red (10R 3/6) clay films on surfaces along pores and on faces of peds; many fine, medium and coarse prominent dark red (10R 3/6) masses of iron accumulation on faces of peds, faces of columns and lining pores; few medium distinct brownish yellow (10YR 6/6) masses of iron accumulation in matrix on on faces of peds; few medium and coarse prominent strong brown (7.5YR 5/6) masses of iron accumulation in matrix and on faces of peds and faces of columns; few coarse prominent yellowish red (5YR 4/6) masses of iron accumulation on faces of peds and faces of columns; few fine and medium black (10YR 2/1) masses of manganese accumulation in matrix and lining a few pores and old root channels; extremely acid; gradual wavy boundary.
Btg5--49 to 79 inches; gray (2.5Y 5/1) silty clay loam; moderate fine and medium subangular blocky structure; firm; few fine and and medium roots; many fine and common medium pores; common distinct reddish brown (2.5YR 4/4) clay films on surfaces along pores and on faces of a few peds; common coarse and very coarse prominent strong brown (7.5YR 5/6) and common coarse prominent reddish yellow (7.5YR 6/8) masses of iron accumulation in matrix; few fine and medium prominent reddish brown (2.5YR 4/4) masses of iron accumulation on faces of peds; few crayfish burrows filled with gray (10YR 5/1) silt loam, fill material has few fine and medium pores and is lined with reddish brown (2.5YR 4/4) masses of iron accumulation; few medium and coarse black (10YR 2/1) masses of manganese accumulation on faces of peds and lining some pores and root channels; few fine and medium black (10YR 2/1) manganese concretions; extremely acid; gradual smooth boundary.
2Btg6--79 to 85 inches; gray (2.5Y 5/1) loam; weak coarse subangular blocky structure; friable; few fine and medium roots; common fine, common medium and few coarse pores; common distinct reddish brown (2.5YR 4/4) clay films on surfaces along most pores and faces of some peds; common fine prominent reddish brown (2.5YR 4/4) massses of iron accumulation lining most pores and on some faces of peds; common coarse and very coarse prominent strong brown (7.5YR 5/6) masses of iron accumulation on faces of peds; common crayfish burrows up to 3 inches in diameter filled with gray (10YR 6/1) and brown (10YR 5/3) fine sandy loam and loamy fine sand; extremely acid.
TYPE LOCATION: Faulkner County, Arkansas; NW1/4 SE1/4 SE1/4, sec. 35, T. 4 N., R. 13 W., lat. 34 degrees, 56 minutes, 11 seconds N and long. 92 degrees, 20 minutes, 18 seconds W., NAD 83, Cato quadrangle.
RANGE IN CHARACTERISTICS: Solum thickness is greater than 60 inches. Reaction ranges from strongly acid to extremely acid throughout.
The A horizon has hue of 10YR, value of 4 or 5, and chroma of 1 to 3. Texture is silt loam or silty clay loam.
The Bt horizon typically has hue of 10YR, 2.5Y or 5Y, value of 5 or 6, and chroma of 1 or 2. Some pedons under anaerobic conditions may have hue of 10Y,10BG, 5B, 10B ,5GY, or N, value of 5 to 7, and chroma of 1. Texture is silt loam or silty clay loam.
The 2Bt horizon has hue of 10YR, 2.5Y or 5Y, value of 5 or 6, and chroma of 1 or 2. Texture is silt loam or silty clay loam.
The 2C horizon, where present, has hue of 10YR, 2.5Y or 5Y, value of 5 or 6, and chroma of 1 or 2. Texture is silt loam, loam, fine sandy loam.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Maumelle soils are in sloughs, depressions and backswamps on flood plains within valleys of the Ouachita Mountains; MLRA 119. Slopes range from 0 to 1 percent. These soils formed in loamy alluvial sediments from sandstone, shale and siltstone. Mean annual precipitation ranges from 41 to 56 inches with the highest amount being distributed in January to May. Mean annual temperature ranges from 60 to 64 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cato, Olmstead, Perry, Psyam and Yorktown. The Cato and Psyam soils are on slightly higher landscapes and are better drained. Olmstead soils are on slightly higher landscapes. Perry and Yorktown soil are on slightly lower landforms and have very-fine control sections.
DRAINAGE AND PERMEABILITY: Maumelle soils are very poorly drained. Runoff is negligible. Permeability is moderate. An apparent water table is at or near the surface year round.
USE AND VEGETATION: Used primarily as wetland habitats.
DISTRIBUTION AND EXTENT: Ouachita Mountains of Arkansas and possibly Oklahoma; MLRA 119. The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES PROPOSED: Faulkner County, Arkansas; 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to a depth of 7 inches.
Argillic horizon - The zone from a depth of 7 inches to a depth of 85 inches.
Aquic conditions - Throughout profile.
ADDITIONAL DATA: Characterization of the typical pedon by the University of Arkansas Soil Characterization Laboratory. Pedon number S98AR045-08-(1-9).