LOCATION PERIDGE AR+MOEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, mesic Typic Paleudalfs
TYPICAL PEDON: Peridge silt loam, on 1 to 3 percent slopes in cultivated orchard. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; brown (10YR 4/3) silt loam; weak medium subangular blocky structure; friable; many fine and medium roots; very strongly acid; abrupt smooth boundary. (4 to 10 inches thick)
Bt1--6 to 16 inches; red (2.5YR 4/6) silt loam; moderate medium subangular blocky structure; friable; many fine roots; many fine and medium tubular pores; few faint reddish brown (2.5YR 4/4) clay films on faces of peds; strongly acid; clear smooth boundary.
Bt2--16 to 30 inches; dark red (2.5YR 3/6) silty clay loam; moderate medium subangular blocky structure; firm; common fine roots; few fine tubular pores; many faint reddish brown (2.5YR 4/4) clay films on faces of peds; about 1 percent by volume gravel 1/2 to 2 inches in diameter; strongly acid; gradual smooth boundary.
Bt3--30 to 43 inches; dark red (2.5YR 3/6) silty clay loam; few medium prominent pale brown (10YR 6/3) mottles; moderate medium blocky structure; firm; few fine roots; few coarse and many fine tubular pores; many faint reddish brown (2.5YR 4/4) clay films on faces of peds; few streak and pockets of light gray (10YR 7/2) uncoated silt and very fine sand grains; very strongly acid; clear wavy boundary. (Combined thickness of the Bt horizon ranges from 10 to 44 inches.)
2Bt4--43 to 60 inches; dark red (2.5YR 3/6) very gravelly clay loam; few medium prominent light brownish gray (10YR 6/2) mottles; moderate medium blocky structure; firm; few fine roots; few fine vesicular pores; many faint reddish brown (2.5YR 4/4) clay films on faces of peds; few streak and pockets of light gray (10YR 7/2) uncoated silt and very fine sand grains; many fine dark iron and manganese concretions; about 45 percent by volume siltstone and sandstone gravel dominantly 1/2 to 3 inches in diameter; very strongly acid; clear wavy boundary.
2Bt5--60 to 68 inches; red (2.5YR 4/6) silty clay; many coarse prominent brownish yellow (10YR 6/6) mottles; strong medium blocky structure; firm; few fine vesicular pores; many faint reddish brown (2.5YR 4/4) clay films on faces of peds; few fine dark iron and manganese concretions; about 3 percent by volume siltstone fragments 1/2 to 2 inches in diameter; very strongly acid; clear wavy boundary. (combined thickness of the 2Bt horizon is 10 to 41 inches)
3Bt6--68 to 80 inches; 60 percent olive yellow (2.5Y 6/6) and 40 percent yellowish red (5YR 5/6) clay; moderate medium and coarse blocky structure; firm; many prominent clay films on faces of peds; few fine dark iron and manganese concretions; very strongly acid.
TYPE LOCATION: Benton County, Arkansas; 2 miles north of Washington County line; 700 feet east on county road; 150 feet north of county road; SE1/4SW1/4SW1/4 sec. 12, T. 18 N., R. 30 W.; USGS Springdale, Ark. quad; lat. 36 degrees 14 minutes 23 seconds N. and 94 degrees 8 minutes 4 seconds W., NAD 83.
RANGE IN CHARACTERISTICS: Solum thickness is 80 inches or more. Reaction ranges from very strongly acid to neutral. Coarse fragments range from 0 to 9 percent in the A, BA, AB and Bt horizons and from 0 to 60 percent in the 2Bt horizon and below. The mean annual soil temperature at 20 inches is 56 to 59 degrees F..
The Ap horizon has hue of 10YR, value of 4 or 5, and chroma of 3 or 4; or hue of 7.5YR, value of 4, and chroma of 4. Some pedons have an A horizon 4 to 6 inches thick with hue of 10YR, value of 2 to 4, and chroma of 2 or 3; or with hue of 7.5YR, value of 3 or 4, and chroma of 2 or 3.
The E horizon, where present, has hue of 10YR, value of 5 or 6, and chroma of 3 or 4. Texture is silt loam.
Some pedons have BA or AB horizons, 2 to 8 inches thick, that have hue of 7.5YR, value of 4 or 5, and chroma of 4 or 6; or hue of 5YR, value of 4 or 5, and chroma of 4 or 6. Texture is silt loam.
The Bt horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8. Subhorizons of the Bt horizon may have value of 3, and chroma of 4 or 6. Mottles, or redox concentrations and depletions are in shades of brown or red. Some subhorizons, have no dominant hue and are mottled in shades of red and brown. Redox depletions with chroma of 2 or less are below 30 inches. Texture is silt loam or silty clay loam.
The 2Bt and 3Bt horizons have hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8, or hue of 2.5YR, value of 3, and chroma of 4 or 6. Mottles, or redox concentrations and depletions are in shades of brown, red and gray. Some subhorizons, have no dominant hue and are mottled in shades of red, brown, yellow and gray. Texture is clay loam, silty clay loam, silty clay, clay and their gravelly or very gravelly analogs.
COMPETING SERIES: These are the Baylis, Crider, Hootentown, Ryker, Stinesville, and Winnipeg series. Baylis, Crider, Ryker, Stinesville, and Winnipeg soils soils formed in loess over residuum or glacial drift. These soils typically contain less sand above the discontinuity. In addition, they have hues of 7.5YR or browner in the upper part of the argillic horizon. Hootentown soils formed in alluvium. They and do not contain a discontinuity and typically have browner hues in the upper part of the argillic horizon.
GEOGRAPHIC SETTING: Peridge soils are on nearly level to moderately steep, broad uplands. Slopes are dominantly 1 to 8 percent, but range to 20 percent. Peridge soils formed in colluvium and residuum from interbedded limestones, sandstones and shales of the Pitkin, Fayetteville, Weddington, Batesville and Hindsville Formations in northern Arkansas and their counterparts in southern Missouri. These formations are not continuous and only outcrop along the Boston Mountain escarpment and as isolated remnants over the Boone Formation that makes up the Springfield Plateau in Arkansas. Peridge soils dominantly occur on these isolated remnants on the Springfield Plateau.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Captina, Clarksville, Nixa, Noark, and Tonti series. These soils typically occur on the Springfield Plateau and should be at slightly lower elevations. Captina, Nixa, and Tonti soils contain a fragipan. Clarksville soils are in a loamy-skeletal family and Noark soils are in a clayey-skeletal family.
DRAINAGE AND PERMEABILITY: Well drained; low to high runoff; moderate permeability.
USE AND VEGETATION: Most areas have been cleared and are used for cultivated crops, orchards, pasture, or hay. Principal crops are corn, small grain, apples, and vegetables. Native vegetation was hardwood forest, mainly oak and hickory.
DISTRIBUTION AND EXTENT: The Ozark Highlands of northwest Arkansas and southern Missouri (MLRA 116A) and the Ozark Border region of southwest and southeast Missouri (MLRA 116B). The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Benton County, Arkansas; 1973.
REMARKS: Diagnostic horizons and features recognized in this pedon are: Ochric epipedon - surface to a depth of 6 inches.
Argillic horizon - 6 inches to a depth of 80 inches.
Lithologic discontinuities - changes in parent material at 43 and 68 inches.
ADDITIONAL DATA: Characterization of the typical pedon by the University of Arkansas Soil Characterization Laboratory. Pedon number 77BN05.
These soils formerly were included in the Bewleyville series.