The Aaron series consists of deep, moderately well drained soils on upland ridges and side slopes. They formed in residuum of interbedded limestone, calcareous shale, and siltstone.
Permeability is slow.
The average annual precipitation is about 45 inches and the average annual temperature is about 55 degrees F. Slopes range from 0 to 25 percent. Solum thickness ranges from 30 to 50 inches. Depth to bedrock ranges from 40 to 60 inches. Soil reaction ranges from strongly acid to mildly alkaline in the the A and B horizons. Reaction in the BC and C horizons range from medium acid to mildly alkaline.