The Merrimac series consists of very deep, somewhat excessively drained soils formed in glacial outwash. They are nearly level to very steep soils on outwash terraces and plains and other glacio-fluvial landforms.
Permeability is moderately rapid or rapid in the solum and rapid or very rapid in the substratum.
Merrimac fine sandy loam - cultivated. 72 degrees 31 minutes 14 seconds W., NAD 27. Solum thickness ranges from 18 to 30 inches. Rock fragments are mainly granitic or gneissic, but up to 25 percent are flat, fine-grained slate, shale, or phyllite fragments. The upper part of the solum commonly has 5 to 20 percent gravel and the lower part 5 to 30 percent.