Echo soundings recorded continuously during a crossing of the Hudson Submarine Canyon system 200 miles southeast of New York Harbor show that the tributaries in 1200-1800 fathoms depth differ in profile and gradient from the Hudson Canyon proper….
Northrop, John. 1953. "A bathymetric profile across the Hudson Submarine Canyon and its tributaries." Journal of Marine Research 12, (2). https://elischolar.library.yale.edu/journal_of_marine_research/795