1. Bedrock topography and thickness of Pleistocene deposits in Union County and adjacent areas, New Jersey [cartographic material] Yale Public content 1974. 2013-04-23T17:10:42Z. 2013-05-02T15:46:56Z. Nemickas, Bronius. U.S. Geological Survey. English. Public. New Jersey, Union County, Essex County, and Union County (N.J.). Pleistocene.