Water-Resources Investigations Report 76–123
AbstractThe Englishtown Formation of the Matawan Group of Late Cretaceous age is exposed in the western part of the New Jeresy Coastal Plain along a northeast-southwest trending zone extending from Raritan Bay to Delaware Bay. In outcrop, in the northern part of the Coastal Plain, the Englishtown typically consists of a series of thin, cross-stratified, fine- to medium-grained lignitic quartz sand beds intercalated with thin beds of sandy silty clay and clayey silt, ranging in total thickness from about 140 feet (43 meters) near Raritan Bay to about 50 feet (15 meters) near Trenton. In the subsurface of the northern part of the Coastal Plain, the formation retains most of the lithologic characteristics displayed in outcrop. In northern and eastern Ocean County the Englishtown can be subdivided into three distinct lithologic units; upper and lower units of quartz sand with thin interbeds of dark sandy silt, separated by a thick sequence of sandy and clayey lignitic silt. The confined part of the aquifer in the Englishtown Formation is
utilized as a source of water over an area of about 1,100 square miles
(2,849 square kilometers) of the New Jersey Coastal Plain and is an
important source of supply in Monmouth and northern Ocean Counties.
The annual average rate of withdrawal from the aquifer in the two-county area increased from 5.5 million gallons per day The Englishtown aquifer is an integral part of the complex multi- aquifer system of the New Jersey Coastal Plain. The withdrawal of water from the Englishtown aquifer has had a marked effect on the water level in the overlying Moutn Laurel aquifer, and these effects will continue so long as the water level in the Englishtown continues to decline. Any increase in the development of the Mount Laurel aquifer that reduces the volume of leakage to the Englishtown will cause an increase in the rate of water-level decline in the Englishtown even with no increase in direct withdrawals. The interrelationship and interdependency between pumping stresses in individual aquifers within the complex Coastal Plain aquifer sytem must be recognized and appreciated, and the hydrodynamics of all parts of the system must be considered if reliable predictions of aquifer response to these stresses are to be made. Such predictions generally require a simulation model analysis of the system. |
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Nichols, W.D., 1977, Geohydrology of the Englishtown Formation in the northern Coastal Plain of New Jersey: U.S. Geological Survey Water-Resources Investigations Report 76–123, 62 p.
Abstract
Introduction
Stratigraphic summary of the Cretaceous formations of the northern
    Coastal Plain of New Jersey
Geohydrology of the Englishtown aquifer system
Conclusions
References cited