Door soils have a mollic epipedon. Grayford soils have loess mantles, chert fragments in the lower solum and a lithologic discontinuity. Mechanicsburg and Panorama soils have a lithologic discontinuity between 20 and 40 inches. Sudley soils contain rock fragments of triassic sandstone and conglomerate gravel and are centered on lower values in the subsoil. Williamsburg soils have sola more than 60 inches thick.
Neshaminy soils are nearly level to steep soils on uplands.
Slope gradients range from 1 to 45 percent. They have developed in materials weathered from diabase and other dark colored basic rocks. These include the competing Chester , Brecknock , Legore , Montalto , and Mount Lucas series and the Aldino , Calvert , Chrome , Conowingo , Glenelg , Kelly , Lehigh , Relay , Towhee , and Watchung soils. Aldino, Calvert, and Towhee soils have fragipans. Chrome and Watchung soils have more than 35 percent clay.