Hall, James; Geological Map of the Middle and Western States. Geology of New York, part 4 comprising the Survey of the 4th District., Lith. Endicott, Albany, 1843. Scale 1 inch = 30 miles. Size 575 x 820 mm.
The map is hand-colored, folded as issued, free of all staining, very minor toning. In very good condition.
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James Hall’s covers the region of the United States from its western boundary along the Mississippi River, east to Long Island and the Atlantic. It includes all or parts of Wisconsin, Illinois, Missouri, Kentucky, Virginia, Indiana, Ohio, Michigan, Pennsylvania, New York, New Jersey, Maryland, and Delaware. The lakes Michigan, Huron, Erie and Ontario are shown. The Allegheny Plateau, Michigan and Illinois basins are clearly delineated, as are many of the East Coast Triassic-Jurassic basins and Great Valley province.?The map is hand-colored and employees twenty-three geological formations all based on Hall’s New York System. The map uses a topographic base map which allowed for far more accuracy then shown on previous maps. This system also emphasized the importance of paleontology for delineating geological units and introduced the concept of "type locality," a primary reference location used for defining the characteristics of geological formations. Hall’s map is the first regional application of this new system, which was to become the basis of the standard nomenclature used today in North America. Hall’s map is considered a milestone in the history of American geology and American geological maps.