LOCATION CORY IN
Established Series
Rev. JDL-KKN
11/2021
CORY SERIES
The Cory series consists of very deep, somewhat poorly drained soils that formed in loess on uplands. Slope ranges from 0 to 6 percent. Mean annual precipitation is about 1067 mm (42 inches), and mean annual temperature is about 12.2 degrees C (54 degrees F).
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Mollic Endoaqualfs
TYPICAL PEDON: Cory silt loam, on a convex, 1 percent slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 20 cm (8 inches); very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; moderate medium granular structure; friable; moderately acid; abrupt smooth boundary. [18 to 25 cm (7 to 10 inches) thick]
Eg--20 to 33 cm (8 to 13 inches); light brownish gray (10YR 6/2) silt loam; weak thick platy structure; friable; few fillings of old root and worm holes with dark grayish brown (10YR 4/2) silt loam; many fine prominent yellowish brown (10YR 5/6) masses of oxidized iron; few fine black (10YR 2/1) iron-manganese concretions; very strongly acid; clear wavy boundary. [8 to 23 cm (3 to 9 inches) thick]
EB--33 to 48 cm (13 to 19 inches); light brownish gray (10YR 6/2) silt loam; weak medium subangular blocky structure; friable; common fine prominent yellowish brown (10YR 5/6) masses of oxidized iron; common fine black (10YR 2/1) iron-manganese concretions; very strongly acid; clear wavy boundary. [10 to 25 cm (4 to 10 inches) thick]
Btg--48 to 107 cm (19 to 42 inches); gray (10YR 5/1) silty clay loam; moderate medium prismatic structure parting to moderate medium angular and subangular blocky; firm; prominent gray (10YR 6/1) clay films on faces of peds and light gray (10YR 7/1) uncoated silt grains on many of the prisms; many medium distinct yellowish brown (10YR 5/4) masses of oxidized iron; many black (10YR 2/1) iron-manganese concretions; moderately acid; clear wavy boundary. [46 to 76 cm (18 to 30 inches) thick]
Bt--107 to 132 cm (42 to 52 inches); yellowish brown (10YR 5/8) silty clay loam; weak coarse subangular blocky structure; firm; distinct dark gray (10YR 4/1) clay films on faces of peds; few black (10YR 2/1) iron-manganese concretions; many medium prominent gray (10YR 6/1) iron depletions; moderately acid; gradual wavy boundary. [20 to 38 cm (8 to 15 inches) thick]
C--132 to 152 cm (52 to 60 inches); yellowish brown (10YR 5/8) silt loam; massive; friable; common medium prominent gray (10YR 5/1) iron depletions; slightly acid.
TYPE LOCATION: Sullivan County, Indiana; about 1 mile east of Farmersburg; 200 feet north and 100 feet west of the center of sec. 6, T. 9 N., R. 8 W.
RANGE IN CHARACTERISTICS:
Thickness of the solum: 102 to 178 cm (40 to 70 inches)
Particle-size control section averages 27 to 33 percent clay and less than 6 percent fine sand and coarser
Ap horizon:
Hue: 10YR
Value: 3
Chroma: 1 or 2
Texture: silt loam
Reaction: moderately acid to neutral
Eg horizon:
Hue: 10YR
Value: 4 to 6
Chroma: 1 or 2
Texture: silt loam
Reaction: very strongly acid to moderately acid
EB horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 1 or 2
Texture: silt loam or silty clay loam
Reaction: very strongly acid to moderately acid
Bt or Btg horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 1 or 2, ranging to 8 in the lower part
Texture: silty clay loam
Clay content: 27 to 33 percent
Reaction: very strongly acid to moderately acid
C horizon:
Hue: 10YR or is neutral
Value: 5 or 6
Chroma: 0 to 8
Texture: silt loam
Reaction: slightly acid or neutral
COMPETING SERIES: These are the
Ansgar,
Coppock,
Newberry, and
Walford series. Ansgar soils have rock fragments in the lower part of the series control section. Coppock soils have an E horizon that is thicker than 23 cm (9 inches). Newberry soils have more clay and sand in the lower part of the series control section. Walford soils are in drier climates and have less than 1016 mm (40 inches) of mean annual precipitation.
GEOGRAPHIC SETTING: Cory soils are on uplands. Slope ranges from 0 to 6 percent. Cory soils formed in loess that is 1.5 to 3 meters (5 to 10 feet) or more in thickness overlying Illinoian age drift, sandstone, limestone, shale, or siltstone. Mean annual precipitation ranges from 1016 to 1118 mm (40 to 44 inches). Mean annual temperature ranges from 10.6 to 12.8 degrees C (51 to 55 degrees F).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Alford,
Iva,
Muren, and
Ragsdale soils. The well drained Alford and moderately well drained Muren soils have light colored surface layers, and are on higher landscape positions. The somewhat poorly drained Iva soils have a light colored surface layer on similar positions. Ragsdale soils are poorly drained soils in nearby depressions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. Depth to the top of an intermittent apparent high water table is 15 to 61 cm (0.5 to 2.0 feet) between December and May in normal years. Potential for surface runoff is negligible to medium depending on slope gradient. Saturated hydraulic conductivity is moderately high throughout the series control section. Permeability is moderate.
USE AND VEGETATION: Most areas are cultivated. Principal crops are corn, soybeans, small grain, and clover grass mixtures. Native vegetation is mixed prairie grass and forest.
DISTRIBUTION AND EXTENT: MLRA 114B in west central Indiana. The series is of small extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: AMHERST, MASSACHUSETTS
SERIES ESTABLISHED: Clay County, Indiana, 1922.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: from the surface to a depth of 48 cm (Ap, E, EB horizons).
Mollic intergrade: from the surface to a depth of 20 cm (Ap horizon).
Albic horizon: from a depth of 20 to 48 cm (E, EB horizons).
Argillic horizon: from a depth of 48 to 132 cm (Btg, Bt horizons).
Aquic conditions: redox features in all horizons below a depth of 20 cm.
National Cooperative Soil Survey
U.S.A.