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Click on the links below to see detailed descriptions of these maps. |
PLEASE USE THE USGS WEBSITE |
| The Geologic Quadrangle (GQ) Series has more than 1,700 multicolor maps that show the bedrock, surficial, or engineering geology of selected 7.5 or 15-minute quadrangles in the United States. The series, begun in 1949, is a continuation of the earlier Folios of the Geologic Atlas of the United States (1894 to 1945). Each map is accompanied by an explanatory text printed on the map margin or occasionally as a separate pamphlet. |  part of "Geologic Map of the Casamero Lake Quadrangle, McKinley County, New Mexico," 1993, 1:24,000, Universal Transverse Mercator projection, 44 x 34 inches. |
| Some maps include cross section for clarity and to show relations at depth; some contain columnar sections describing stratigraphy; some maps show structure contours. Sheet size and projection depend on the base map on which the geology is plotted. The most common scale is 1:24,000; some are at 1:31,680, 1:62,500, or 1:63,360 (Alaska). Each map is folded and placed in a paper jacket. | |