LOCATION MOUND CREEK MNEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Endoaquolls
TYPICAL PEDON: Mound Creek clay loam, on a concave slope of l percent, in a hay field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 25 centimeters; black (10YR 2/1) clay loam, very dark gray (10YR 3/1) dry; moderate and medium subangular blocky structure; friable; slightly acid; abrupt smooth boundary.
A--25 to 56 centimeters; very dark gray (10YR 3/1) clay loam; dark gray (10YR 4/1) dry; moderate medium subangular blocky structure; friable; slightly acid; clear wavy boundary.
Bg--56 to 71 centimeters; grayish brown (2.5Y 5/2) clay loam; moderate medium subangular blocky structure; friable; common medium distinct yellowish brown (10YR 5/6) redoximorphic features; slightly acid; clear wavy boundary.
R--71 centimeters; pinkish red, hard quartzite bedrock.
TYPE LOCATION: Major Land Resource Area (MLRA) 103-Central Iowa and Minnesota Till Prairies, Brown County, Minnesota subset; about 10 west of Comfrey; located about 700 feet east and 1,100 feet north of the southwest corner of section 31, T. l08 N., R. 35 W.; USGS Sanborn, SE topographic quadrangle; lat. 44 degrees 06 minutes 40 seconds N. and long. 95 degrees 05 minutes 51 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon--25 to 60 centimeters
Depth to bedrock--50 to 100 centimeters
Clay content of the particle-size control section (weighted average)--18 to 32 percent
Sand content of the particlesize control section (weighted average)--15 to 45 percent
Ap or A horizon:
Hue--10YR, 2.5Y, 5Y, or is neutral
Value--2 or 3
Chroma--0 to 2
Texture--clay loam or loam
Clay content--26 to 35 percent
Sand content--20 to 40 percent
Rock fragment content--0 to 10 percent, mixed lithology
Reaction--pH 6.1 to 7.3
Thickness--25 to 60 centimeters
Bg horizon:
Hue--10YR, 2.5Y, or 5Y
Value--4 or 5
Chroma--1 or 2 upper part; 1 to 4 lower part
Texture--clay loam or loam
Clay content--25 to 35 percent
Sand content--20 to 40 percent
Rock fragment content--0 to 10 percent, mixed lithology
Reaction--pH 5.6 to 7.3
Thickness--15 to 60 centimeters
Some pedons do not have redoximorphic features in some parts
Some pedons have as much as 35 percent rock fragments of mixed lithology
COMPETING SERIES: These are the
Clyde,
Faxon,
Kossuth,
Letri,
Marengo,
Reddick,
Selma,
Selmass,
Tripoli,
Webster, and
Wolcott series.
Clyde--do not have a lithic contact within a depth of 100 centimeters
Faxon--have a lithic contact with limestone within a depth of 100 centimeters and have a reaction range of neutral to slightly alkaline in the series control section
Kossuth--have a clay content that averages 32 to 35 percent in the particle-size control section and do not have a lithic contact within a depth of 100 centimeters
Letri--have carbonates within a depth of 75 centimeters
Marengo--do not have a lithic contact within a depth of 100 centimeters
Reddick--have a sand content of less than 20 percent in the lower third of the series control section and do not have a lithic contact within a depth of 100 centimeters
Selma--have a clay content of 3 to 15 percent in the lower third of the series control section and do not have a lithic contact within a depth of 100 centimeters
Selmass--have a sand content of more than 80 percent in the lower third of the series control section and do not have a lithic contact within a depth of 100 centimeters
Webster--have a clay content range of 20 to 30 percent in the lower third of the series control section and do not have a lithic contact within a depth of 100 centimeters
Wolcott--have a reaction range of slightly alkaline or moderately alkaline in the lower third of the series control section and do not have a lithic contact within a depth of 100 centimeters
GEOGRAPHIC SETTING:
Parent material--50 to 100 centimeters of loamy till underlain by Sioux quartzite bedrock
Landform--nearly level or slightly concave positions on rock-cored terraces or structural benches on moraines
Slope--0 to 2 percent
Elevation--300 to 400 meters above sea level
Mean annual air temperature--6 to 10 degrees C
Mean annual precipitation--585 to 890 millimeters
Frost-free period--155 to 200 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Annton,
Clarion,
Delft,
Germantown,
Little Cottonwood,
Pell Creek, and
Webster soils.
Annton--are on higher landscape positions and do not have a lithic contact within a depth of 100 centimeters
Clarion--are on higher landscape positions and do not have a lithic contact within a depth of 100 centimeters
Delft--are on landscape positions similar to those of the Mound Creek soils, do not have a lithic contact within a depth of 100 centimeters, and have a mollic epipedon more than 60 centimeters thick
Germantown--are on higher landscape positions, have a lithic contact with quartzite bedrock within a depth of 100 centimeters, and do not have a frequently saturated zone within a depth of 1.8 meters during the wettest period of years when precipitation is within one standard deviation of the 30 year mean annual precipitation
Little Cottonwood--are on landscape positions similar to those of the Mound Creek soils and have a lithic contact with quartzite bedrock within a depth of 50 centimeters
Pell Creek--are on landscape positions similar to those of the Mound Creek soils and do not have a lithic contact within a depth of 100 centimeters
Webster--are on landscape positions similar to those of the Mound Creek soils and do not have a lithic contact within a depth of 100 centimeters
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained--these soils are frequently saturated at the soil surface to a depth of 0.3 meter during the wettest periods of years when precipitation is within one standard deviation of the 30 year mean annual precipitation
Saturated hydraulic conductivity--1.00 to 10.00 micrometers per second
USE AND VEGETATION:
Most areas are cultivated. Some areas are pastured. The native vegetation is big blue stem, little bluestem, switchgrass, and other grasses of the tall grass prairie.
DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic section--Western lake section
MLRA--Central Iowa and Minnesota Till Prairies (103)
LRR M; west-central and central Minnesota
Extent--small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota; MLRA SSO 10-5 (Albert Lea, Minnesota).
SERIES ESTABLISHED: Cottonwood County, Minnesota, 2009.
REMARKS:
Particle-size control section--the zone from a depth of 25 to 71 centimeters; series control section--the zone from the surface to a depth of 71 centimeters.
Diagnostic horizons and features recognized in this pedon are:
mollic epipedon--the zone from the surface to a depth of 56 centimeters (Ap and A horizon);
cambic horizon--the zone from a depth of 56 to 71 centimeters (Bg horizon);
aquic moisture regime.
Previously mapped as Webster Variant.
Cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.
Taxonomy versionKeys to Soil Taxonomy, tenth edition, 2006.