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Map of Geology of the Sea Bottom in the Approaches to New York Bay. Thismap depicts the upper reaches of Hudson Canyon and the remnants of a valley incontinental shelf. This early physiographic map was published in the Coast andGeodetic Survey Annual Report for 1884, Appendix 13, p. 438. It was drawn byAdolph Lindenkohl and is the earliest published map of a submarine canyon. (Image credit: Archival Photography by Steve Nicklas)