LOCATION MCGARY IN+IL KY OH VA WVEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, mesic Aeric Epiaqualfs
TYPICAL PEDON: McGary silt loam on a nearly level lake plain flat in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 28 cm (0 to 11 inches); dark grayish brown (10YR 4/2) silt loam, light gray (10YR 7/2) dry; weak coarse subangular blocky structure parting to moderate fine and medium granular; friable; neutral; abrupt smooth boundary. (15 to 30 cm or 6 to 12 inches thick)
2Bt--28 to 38 cm (11 to 15 inches); brown (10YR 5/3) silty clay; moderate medium subangular blocky structure; firm; many faint grayish brown (10YR 5/2) clay films on faces of peds; common fine distinct gray (10YR 6/1) iron depletions in the matrix; moderately acid; clear smooth boundary.
2Btg1--38 to 56 cm (15 to 22 inches); grayish brown (10YR 5/2) silty clay; weak fine and medium prismatic structure parting to moderate medium angular blocky; firm; many distinct gray (10YR 5/1) clay films on faces of peds; common fine distinct yellowish brown (10YR 5/4) masses of iron accumulation in the matrix; few fine black (10YR 2/1) iron and manganese oxide concretions; neutral; clear smooth boundary.
2Btg2--56 to 69 cm (22 to 27 inches); grayish brown (10YR 5/2) silty clay; moderate medium prismatic structure parting to moderate medium angular blocky; firm; many distinct gray (10YR 5/1) clay films on faces of peds; common fine distinct yellowish brown (10YR 5/4) masses of iron accumulation in the matrix; slightly effervescent in places; slightly alkaline; gradual irregular boundary.
2Btg3--69 to 107 cm (27 to 42 inches); gray (10YR 5/1) silty clay; moderate medium prismatic structure parting to moderate medium angular blocky; firm; common distinct gray (10YR 6/1) clay films on faces of peds; common fine distinct light yellowish brown (10YR 6/4) masses of iron accumulation in the matrix; few fine and medium weakly cemented carbonate nodules; slightly effervescent; slightly alkaline; clear irregular boundary. (Combined thickness of the Bt horizons is 46 to 97 cm or18 to 38 inches.)
2BCtkg--107 to 127 cm (42 to 50 inches); gray (10YR 6/1) silty clay; weak coarse angular blocky structure; firm; few faint gray (10YR 5/1) clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) masses of iron accumulation in the matrix; common fine and medium weakly cemented carbonate nodules; strongly effervescent; moderately alkaline; gradual wavy boundary. (0 to 30 cm or 0 to 12 inches thick)
2Cg--127 to 152 cm (50 to 60 inches); gray (10YR 6/1) stratified silty clay loam and silty clay; massive; firm; common fine prominent yellowish brown (10YR 5/6) masses of iron accumulation in the matrix; common fine and medium weakly cemented carbonate nodules; strongly effervescent; moderately alkaline.
TYPE LOCATION: Greene County, Indiana; at the north edge of Marco; 2,050 feet east and 700 feet north of the southwest corner of sec. 24, T. 6 N., R. 7 W. USGS Sandborn, IN topographic quadrangle; lat. 38 degrees 56 minutes 21 seconds N. and long. 087 degrees 8 minutes 30 seconds W. NAD 1927; UTM Zone 16, 487722 easting and 4310041 northing, NAD 83.
RANGE IN CHARACTERISTICS:
Depth to the base of the argillic horizon: 61 to 127 cm (24 to 50 inches)
Depth to carbonates: 56 to 142 cm (22 to 56 inches)
Thickness of the loess: 0 to 51 cm (0 to 20 inches)
The particle-size control section averages 40 to 50 percent clay and 2 to 6 percent sand.
Ap horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 2 to 4
Texture: silt loam or silty clay loam
Reaction: moderately acid to neutral
A horizon, where present: 3 to 8 cm (1 to 3 inches) thick
Hue: 10YR
Value: 3 or 4
Chroma: 1 to 3
2Bt, 2Btg, Bt or Btg horizon:
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 1 to 6
Texture: silty clay or silty clay loam
Clay content: 35 to 55 percent
Sand content: 2 to 6 percent
Reaction: very strongly acid to neutral in the upper part and neutral to slightly alkaline in the lower part
Calcium carbonate equivalent: 0 to 15 percent
2BCtkg, 2BCg, 2BC horizon:
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 1 to 6
Texture: commonly silty clay or silty clay loam, and less commonly clay
Clay content: 35 to 55 percent
Sand content: 1 to 20 percent
Reaction: neutral to moderately alkaline
Calcium carbonate equivalent: 0 to 30 percent
2C, 2Cg horizon:
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 1 to 6
Texture: commonly stratified silty clay and silty clay loam, and less commonly includes thin strata of clay and silt loam
Clay content: 24 to 55 percent
Sand content: 1 to 20 percent
Reaction: slightly alkaline to moderately alkaline
Calcium carbonate equivalent: 10 to 40 percent
COMPETING SERIES: These are the Crosby, Hyatts, and Smothers series. Crosby soils have rock fragments in the series control section. Hyatts soils have a paralithic contact in the series control section. Smothers soils have a lithic contact in the series control section.
GEOGRAPHIC SETTING: McGary soils are typically on flats on lake plains, and less commonly on flood-plain steps. Slopes are dominantly 0 to 2 percent, but range to 10 percent. These soils formed in 0 to 51 cm (0 to 20 inches) of loess, and in the underlying calcareous, fine-textured lacustrine sediments of the Wisconsin stage. Mean annual temperature ranges from 10 to 14 degrees C (50 to 57 degrees F), and mean annual precipitation ranges from 889 to 1168 mm (35 to 46 inches). Frost free period ranges from 150 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: McGary soils are commonly associated with the Markland, Montgomery, Shircliff and Zipp soils. They are also associated with the Booker and Kings soils. The well drained Markland are on risers and moderately well drained Shircliff soils are on treads of dissected lake plains. The very poorly drained Booker, Kings, Montgomery, and Zipp soils are on flats and depressions on lake plains.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. The potential for surface water runoff is low to high. Saturated hydraulic conductivity is low or moderately low (0.01 to 1.41 micrometers/s). Permeability is slow or very slow. In undrained areas, depth to an intermittent perched seasonal high water table is at 0.1 to 0.5 meters (0.5 to 1.5 feet) from December through April in most years. On flood-plain steps, this soil is subject to frequent to rare periods of flooding.
USE AND VEGETATION: Most areas of this soil are being used to grow corn and soybeans. A few areas are used for growing wheat and hay, and a few areas are used for pasture or forest. Native vegetation is mixed hardwood forest.
DISTRIBUTION AND EXTENT: Southern Indiana, southwestern and southern Ohio, northern Kentucky, southwestern Illinois, Virginia and West Virginia. The series is of large extent, and is in MLRA's 111B, 113, 114A, 114B, 115A, 120A, 120B, 121, 122, 124, 126 and 147. The type location is on the boundary between MLRA's 114B and 115A.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Gibson County, Indiana, 1926.
REMARKS: In this update, the type location was revisited, and the typical pedon updated. This pedon does not exhibit episaturation very well and the type location may be moved to one that does so. Flooded, non-flooded, drained and undrained phases are recognized.
Diagnostic horizons and features recognized in this pedon are: 1) ochric epipedon: the zone from 0 to 28 cm (0 to 11 inches) (Ap horizon); 2) argillic horizon: the zone from 28 to 107 cm (11 to 42 inches) (2Bt, 2Btg1, 2Btg2, 2Btg3 horizons); and 3) redox depletions: 28 to 152 cm (11 to 60 inches).
ADDITIONAL DATA: Lab data is available from the National Soil Survey Lab: S60IN-28-2 (typical pedon), S60IN-28-1, S91IN-123-101; lab data is available from the Agricultural Experiment Station, Purdue University: S76IN-83-5, S79IN-125-16, S80IN-71-3, S81IN-101-7, and S81IN-175-3.