The configuration of the seafloor off the east coast of the United States as determined by the United States Coast Survey

The configuration of the seafloor off the east coast of the United States as determined by the United States Coast Survey. Hudson Canyon off New York and New Jersey is shown on this map as is Pourtales Plateau off the Florida Keys. Published in Petermann’s Geographische Mittheilungen in 1870. Different bottom materials and the shelf break are shown on these maps.