Crosswicks Creek is a 25.3-mile-long (40.7 km)[1] tributary of the Delaware River in Burlington County, in western New Jersey in the United States.
Crosswicks Creek watershed encompasses parts of Burlington, Mercer, Monmouth and Ocean Counties. Its headwaters flow from the Fort Dix and McGuire Air Force Base Military Reserves in a northwesterly direction and then turn sharply south where it meets the Delaware River at Bordentown Township. With jets roaring overhead and shells being test fired, the Crosswicks Creek watershed has a set of unique concerns and is the focus of many protection and restoration activities. The New Jersey Department of Transportation has opened the I-295 extension that has had a significantly impact on the Hamilton Marsh, located near the mouth of the Crosswicks. Parts of the marsh were filled in, while new wetlands were created at the expense of established woodlands. As the new road bisects the marsh, interference of wildlife movement patterns may have occurred. In light of these activities, there is tremendous support for the development of a Hamilton Marsh Greenway.
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Although most of the creek does not yield particularly abundant deposits of fossils, fossils from the Pleistocene and Cretaceous eras have been found. There exist patches of particularly fossiliferous deposits among mostly non-fossiliferous deposits throughout the creek's path.[2][3]