They formed in weathered nonacid shale and siltstone, with some thin beds of limestone. The climate is humid and temperate. These include the competing Culleoka and Westmoreland series in addition to the Brooke , Guernsey , and Library series. Brooke, Guernsey, and Library soils contains 35 percent or more clay. Moderately well drained.
Surface runoff is medium to rapid.
Permeability is slow or moderately slow. Most of these soils on lower slopes have been cleared and farmed but many areas are now used for pasture or are idle. Some areas are wooded, dominately of mixed oaks. Extent is believed to be large. Allegheny County, Pennsylvania, 1973.