Drake, Avery Ala, Jr., Volkert, Richard A., Monteverde, Donald H., Herman, Gregory C., Houghton, Hugh F., Parker, Ronald A., and Dalton, Richard F., 1996, Bedrock geologic map of northern New Jersey: U.S. Geological Survey Miscellaneous Investigations Series Map I-2540-A, 2 sheets, scale 1:100,000, 7 p., available at http://pubs.usgs.gov/imap/2540/a/.