Map of Long Island, showing the southern limit of the ice sheet: adapted from the U.S. Coast Survey Chart: by F.J.H. Merrill [1886]

Topographic map also covering New York City, Long Island Sound, and the southern coast of Connecticut. Relief shown by hachures and landform drawings. Extracted from: The geology of Long Island / by F.J.H. Merrill. [S.l. : s.n., 1886?]. Map date: 1884. “Annals, vol. III, plate XXVIII.”