LOCATION CORYDON IN+KY MD VA WVEstablished Series
TAXONOMIC CLASS: Clayey, mixed, superactive, mesic Lithic Argiudolls
TYPICAL PEDON: Corydon flaggy silty clay loam, on a convex, 45 percent slope in a forest. (Colors are for moist soil unless otherwise stated.)
A1--0 to 2 cm (0 to 1 inch); very dark grayish brown (10YR 3/2) flaggy silty clay loam, dark grayish brown (10YR 4/2) dry; moderate very fine subangular blocky structure; friable; many very fine and fine roots; many very fine and fine interstitial and tubular pores; 20 percent limestone flagstones; neutral; abrupt smooth boundary.
A2--2 to 13 cm (1 to 5 inches); very dark grayish brown (10YR 3/2) flaggy silty clay loam, dark grayish brown (10YR 4/2) dry; moderate very fine angular blocky structure; friable; many very fine and fine roots; common very fine and fine tubular pores; many faint very dark gray (10YR 3/1) organic coatings on faces of peds and in pores; 16 percent limestone flagstones; neutral; clear wavy boundary. [Combined thickness of the A horizon is 10 to 23 cm (4 to 9 inches).]
Bt1--13 to 23 cm (5 to 9 inches); dark brown (10YR 3/3) silty clay; moderate fine angular blocky structure; firm; common very fine and fine roots; few very fine and fine tubular pores; many distinct very dark grayish brown (10YR 3/2) organo-clay films on faces of peds and in pores; 10 percent limestone channers; neutral; clear wavy boundary.
Bt2--23 to 33 cm (9 to 13 inches); dark yellowish brown (10YR 3/4) silty clay; strong fine and medium angular blocky structure; firm; common very fine and fine roots between peds; few very fine and fine tubular pores; many distinct very dark grayish brown (10YR 3/2) organo-clay films on faces of peds; 10 percent limestone channers; neutral; gradual wavy boundary.
Bt3--33 to 43 cm (13 to 17 inches); dark yellowish brown (10YR 3/4) silty clay; strong medium angular blocky structure; firm; few very fine and fine roots between peds; common distinct very dark grayish brown (10YR 3/2) organo-clay films on faces of peds; 14 percent limestone channers; neutral; abrupt irregular boundary. [Combined thickness of Bt horizon is 18 to 41 cm (7 to 16 inches).]
R--43 cm (17 inches); indurated limestone bedrock.
TYPE LOCATION: Owen County, Indiana; 1,900 feet north and 325 feet west of the southeast corner of sec. 4, T. 10 N., R. 3 W.
RANGE IN CHARACTERISTICS:
Depth to the base of the argillic horizon: 25 to 51 cm (10 to 20 inches)
Depth to lithic contact: 25 to 51 cm (10 to 20 inches)
A horizon:
Hue: 10YR
Value: 2 or 3
Chroma: 1 to 3
Texture: commonly flaggy silty clay loam, and less commonly silty clay loam or silt loam or the channery analogs of these textures
Rock fragment content: 10 to 34 percent limestone channers or flagstones Reaction: slightly acid or neutral
Bt horizon:
Hue: 10YR
Value: 3 or 4
Chroma: 3 or 4
Texture: silty clay or clay or the channery, flaggy, very channery, or very flaggy analogs of these textures
Rock fragment content: 10 to 40 percent limestone channers or flagstones
Reaction: neutral or slightly alkaline
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Corydon soils are on sloping to very steep hills underlain with limestone. Slope gradients are dominantly greater than 20 percent but range from 6 to 70 percent. The soils formed in as much as 20 cm (8 inches) of loess and in the underlying limestone residuum. Mean annual precipitation ranges from 1016 to 1168 mm (40 to 46 inches). Mean annual air temperature ranges from 11 to 14 degrees C (52 to 57 degrees F).
GEOGRAPHICALLY ASSOCIATED SOILS: Caneyville, Crider, Haggatt, and Romona soils. The moderately deep Caneyville soils do not have a dark colored surface layer. The very deep Crider and deep Haggatt soils are on summits and shoulders. The moderately deep Romona soils are on nearby landform positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained. The potential for surface runoff is medium to very high. Saturated hydraulic conductivity is moderately high in the solum. Permeability is moderately slow.
USE AND VEGETATION: Mainly in forest. Some less sloping areas are used for hayland or pasture. Native vegetation is mixed deciduous hardwood forest.
DISTRIBUTION AND EXTENT: Southern Indiana, northern Kentucky, Maryland, Virginia, and West Virginia; MLRAs 111A, 114A, and 122 (in Indiana). The type location is in MLRA 122. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana.
SERIES ESTABLISHED: Washington County, Indiana, 1932.
REMARKS: The particle-size control family needs to be evaluated as data is collected on this soil. Characterization data on the Romona series from the same area indicates the family should be fine, and not include very fine.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: from the surface to a depth of 23 cm (A1, A2, Bt1 horizons).
Argillic horizon: from a depth of 13 to 43 cm (Bt horizon).
Lithic contact: at 43 cm (top of R layer).