In some pedons the C horizon is stratified and may contain strata of silty clay. These are the Prout series. Closely similar are the Cavode , Evendale , Tygart , and Tyler series. Prout soils are moderately deep and have bedrock within 40 inches of the soil surface. Cavode, Evendale, and Tygart, soils have clayey particle-size control sections.
Guyan soils are on nearly level low stream terraces and high flood plains.
These soils have formed in alluvium derived from interbedded shale, siltstone, and sandstone. Slope ranges from 0 to 3 percent. Mean annual precipitation ranges from 35 to 50 inches. Allegheny, Kanawha, Cotaco, Markland, Monagahela, Purdy, and Tyler soils are on landscape positions similar to Guyan soils. Allegheny and Kanawha soils are well drained.