LOCATION COLLINWOOD              MN+IA

Established Series
Rev. RJE-AGG-TCJ
01/2011

COLLINWOOD SERIES

The Collinwood series consists of very deep, somewhat poorly drained soils that formed in clayey, calcareous lacustrine sediments on glacial lake plains. The permeability is moderately slow or slow. Slopes range from 0 to 18 percent. Mean annual air temperature is about 48 degrees F. Mean annual precipitation is about 28 inches.

TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Hapludolls

TYPICAL PEDON: Collinwood silty clay loam--on a lope of about 2 percent on a glacial lake plain in a cultivated field. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 10 inches; black (10YR 2/1) silty clay loam, very dark gray (10YR 3/1) dry; weak fine subangular blocky structure; friable; moderately acid; abrupt smooth boundary.

A--10 to 16 inches; black (10YR 2/1) silty clay loam, very dark gray (10YR 3/1) dry; weak fine subangular blocky structure; friable; moderately acid; abrupt smooth boundary. (12 to 20 inches combined thickness)

BA--16 to 21 inches; very dark grayish brown (10YR 3/2) silty clay, moderate fine subangular blocky structure; firm; few very dark gray (10YR 3/1) coatings on peds; moderately acid; clear smooth boundary. (0 to 6 inches thick)

Bw--21 to 32 inches; olive brown (2.5Y 4/4) clay;) moderate fine prismatic structure; few fine faint dark grayish brown (2.5Y 4/2) Fe depletions and few fine faint light olive brown (2.5Y 5/6) Fe concentrations; moderately acid; clear wavy boundary. (5 to 10 inches thick)

C1--32 to 45 inches; yellowish brown (10YR 5/4) silty clay; massive (varved); firm; common medium distinct gray (10YR 6/1) and few fine distinct strong brown (7.5YR 5/6) Fe concentrations; few fine distinct black (10YR 2/1) Mn oxide granules; slightly effervescent; slightly alkaline; clear smooth boundary.

C2--45 to 60 inches; yellowish brown (10YR 5/4) silty clay; massive; friable; common medium distinct gray (10YR 6/1) Fe depletions and faint pale brown (10YR 6/3) Fe concentrations; few strong brown (7.5YR 5/8) Fe oxide stains; strongly effervescent; slightly alkaline.

TYPE LOCATION: Faribault County, Minnesota; about 1,450 feet east and about 850 north of the southwest corner of sec. 9, T. 102 N., R. 27 W., USGS Blue Earth Quadrangle, lat. 43 degrees 38 minutes 50 seconds N., long. 94 degrees 04 minutes 56 seconds W., NAD27.

RANGE IN CHARACTERISTICS: Depth to free carbonates range from 24 to 50 inches. The mollic epipedon ranges from 14 to 24 inches in thickness. The profile to a depth of 60 inches lacks rock fragments. The 10- to 40-inch control section commonly has less than 15 percent sand and 35 to 60 percent clay

The Ap or A horizon has hue of 10YR, value of 2 or 3, and chroma of 1 pr 2. It is silty clay silty
clay loam, or clay. It is moderately acid or slightly acid.

The Bw horizon has hue of 10YR or 2.5Y hue in the upper part and 2.5Y hue in the lower part, value of 3 to 5 and chroma of 2 to 4.
in the upper part and 2 through 4 in the lower part. Faces of peds commonly have value of 2 or 3 and chroma of 1 or 2. It is silty clay, clay or silty clay loam. It is medium acid to slightly acid.

The C horizon has 10YR or 2.5Y hue, value of 5 or 6, and chroma of 2 through 4. It is silty clay, clay, or silty clay loam that may grade to silt loam in the lower part. Loamy glacial till occurs below a depth of 60 inches as a phase.

COMPETING SERIES: These are the Guckeen, Kandiyohi, Nameoki, and Ocheda soils. Guckeen soils have 20 to 40 inches of lacustrine sediment over glacial till. Kandiyohi and Nameoke soils have moist bulk density less than 1.6 g/cc in the lower third of the series control section. The Ocheda soils have 40 to 60 inches of lacustrine sediment over glacial till.

GEOGRAPHIC SETTING: Collinwood soils are on plane to convex slopes on glacial lake plains. Slope gradients range from 0 to 18 percent. Collinwood soils formed in fine textured lacustrine sediments that are over 60 inches thick. These sediments are late Wisconsinan in age. Mean annual air temperature is about 45 to 50 degrees F, and mean annual precipitation ranges from about 25 to 30 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: Waldorf and Lura soils are the main ones. Waldorf soils are poorly drained and are nearly level. Lura soils are very poorly drained and are in depressions. These soils formed in similar materials. .

DRAINAGE AND PERMEABILITY: Somewhat poorly drained. The depth to saturation is as high as 1.5 feet during March to June in normal years. Surface runoff is low to high. Permeability ismoderately slow or slow.

USE AND VEGETATION: Most of the acreage is cropped intensively to corn and soybeans. Native vegetation is tall grass prairie.

DISTRIBUTION AND EXTENT: MLRA-103. Southern Minnesota and Northern Iowa. Moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota

SERIES ESTABLISHED: Nobles County, Minnesota, 1970.

REMARKS: Diagnostic properties and horizons recognized in the pedon are: mollic epipedon - the zone from 0 to 18inches (Ap, A, BA horizons); cambic horizon - the zone from 18 to 33 inches (Bw1 and Bw2 horizons); Aquertic subgroup based on 2 chroma color below the mollic and more than 6.0 cm cole in the upper 40 inches of the pedon. In the past this soil included the concept of the Ocheda series.

The type location was moved as of this revision to better reflect the landscape and material representative of this series. 1/21/2011-TYPE LOCATION error was corrected.

ADDITIONAL DATA: Refer to MAES Central File Code No. 507 and 508 for results of some laboratory analyses and to Lincoln Laboratory S69Minn-7-9.

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National Cooperative Soil Survey
U.S.A.