Polkton soil series
The Polkton series consists of moderately deep, moderately well drained, very slowly permeable soils on uplands of the Triassic Basins in the Southern Piedmont. They formed in residuum weathered from Triassic siltstone, mudstone, shale, and sandstone. Slope ranges from 2 to 25 percent.
TAXONOMIC CLASS: Fine, mixed, active, thermic Oxyaquic Vertic Hapludalfs
DIAGNOSTIC FEATURES:
Ochric epipedon - the zone from the soil surface to a depth of 7 inches (Ap horizon)
Argillic horizon - the zone from 7 to 28 inches below the surface (Btss1 and Btss2 horizons)
Slickensides - presence of slickensides in the zone from 7 to 28 inches (Btss1 and Btss2 horizons)
Paralithic contact - the occurrence of weathered bedrock at a depth of 28 inches (upper boundary of the Cr horizon).
Vertic feature: cracks within 50 inches of the soil surface that are 5 mm or more wide through a thickness of 12 inches or more for some time in normal years, and slickensides or wedge-shaped aggregates in a layer 6 inches or more thick that has its upper boundary within 50 inches of the soil surface; or a linear extensibility of 2.5 inches or more between the surface and either a depth of 40 inches or a paralithic contact, whichever is shallower
Oxyaquic feature: Saturation with water in one or more layers within 40 inches of the surface in normal years for either or both 20 or more consecutive days or 30 or more cumulative days.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 20 to 40 inches. Depth to weathered bedrock is 20 to 40 inches. Depth to hard bedrock is 40 to 60 inches or more. Rock fragment content ranges from 0 to 10 percent by volume. Linear extensibility totals 6.0 cm or more between the surface and paralithic contact. Nonintersecting slickensides range from few to common in the Btss horizon. Base saturation by sum of cations increases with depth and ranges from 35 to 60 percent immediately above the paralithic contact. Exchangeable aluminum content of the Btss horizon is high (10 to 25 me/100g). The soil is very strongly acid to slightly acid in the A horizon and very strongly acid or strongly acid in the B and C horizons.
For a detailed description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/P/POLKTON.html
For geographic distribution, visit:
Polkton soil series
The Polkton series consists of moderately deep, moderately well drained, very slowly permeable soils on uplands of the Triassic Basins in the Southern Piedmont. They formed in residuum weathered from Triassic siltstone, mudstone, shale, and sandstone. Slope ranges from 2 to 25 percent.
TAXONOMIC CLASS: Fine, mixed, active, thermic Oxyaquic Vertic Hapludalfs
DIAGNOSTIC FEATURES:
Ochric epipedon - the zone from the soil surface to a depth of 7 inches (Ap horizon)
Argillic horizon - the zone from 7 to 28 inches below the surface (Btss1 and Btss2 horizons)
Slickensides - presence of slickensides in the zone from 7 to 28 inches (Btss1 and Btss2 horizons)
Paralithic contact - the occurrence of weathered bedrock at a depth of 28 inches (upper boundary of the Cr horizon).
Vertic feature: cracks within 50 inches of the soil surface that are 5 mm or more wide through a thickness of 12 inches or more for some time in normal years, and slickensides or wedge-shaped aggregates in a layer 6 inches or more thick that has its upper boundary within 50 inches of the soil surface; or a linear extensibility of 2.5 inches or more between the surface and either a depth of 40 inches or a paralithic contact, whichever is shallower
Oxyaquic feature: Saturation with water in one or more layers within 40 inches of the surface in normal years for either or both 20 or more consecutive days or 30 or more cumulative days.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 20 to 40 inches. Depth to weathered bedrock is 20 to 40 inches. Depth to hard bedrock is 40 to 60 inches or more. Rock fragment content ranges from 0 to 10 percent by volume. Linear extensibility totals 6.0 cm or more between the surface and paralithic contact. Nonintersecting slickensides range from few to common in the Btss horizon. Base saturation by sum of cations increases with depth and ranges from 35 to 60 percent immediately above the paralithic contact. Exchangeable aluminum content of the Btss horizon is high (10 to 25 me/100g). The soil is very strongly acid to slightly acid in the A horizon and very strongly acid or strongly acid in the B and C horizons.
For a detailed description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/P/POLKTON.html
For geographic distribution, visit: