The resulting maps are called geologic quadrangle maps. The 1:25,000 maps are what geologists typically use as a base for mapping the geology of a local area. These latter, newer, maps use the metric system for map distances and contour intervals. In addition, there is a series of maps with a scale of 1:250,000, called quarter-million maps. In recent times those quadrangle maps have been supplanted by seven-and-a-half-minute quadrangle maps that are about the same size at the old 1:24,000 maps but at a slightly different, but more rational scale of 1:25,000. Maps, called seven-and-a-half-minute quadrangle maps, that spanned 7-1/2' of longitude and 7-1/2' of latitude at a scale of 1:24,00.Maps, called fifteen-minute quadrangle maps, that spanned 15' of longitude and 15' of latitude at a scale of 1:62,500, which is exactly one inch to the mile. For many years there were two standard map scales: \)Īlmost all of the area of the United States has been represented on topographic maps at various scales.
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