MLRA 63A - Northern Rolling Pierre Shale Plains South Dakota 29,610 km2 (11,430 mi2)

Soils:
Most of the soils are Ustolls and Orthents. They are fine textured and very fine textured and have a mesic temperature regime and montmorillonitic mineralogy. The nearly level to rolling, well drained, moderately deep and deep Haplustolls (Promise and Boyd series), Argiustolls (Millboro and Reliance series), Camborthids (Swanboy series), and Ustochrepts (Boro, Lakoma, and Labu series) are on uplands. Shallow Ustorthents (Okaton and Sansarc series) are on the steeper slopes. Poorly drained Haplaquolls (Kolls series) are in upland depressions.

12/16/98