Review of the permeability characteristics of the Woodbury Clay; New Jersey geological survey technical memorandum

The Woodbury-Merchantville confining layer overlies the Potomac-Raritan-Magothy aquifer system and underlies the Englishtown aquifer. It is one of the major hydrogeologic features of the New Jersey Coastal Plain. Prior to about 1950, the confining layer, particularly the Woodbury Clay, was believed to be impermeable. All water entering aquifers in the Potomac-RaritanMagothy system was believed to come from west of the outcrop area of the confining layer. It has become clear, however, that considerable vertical leakage occurs through the Woodbury Merchantville confining layer to the underlying aqiufers