Geology of the conterminous United States at 1:2,500,000 scale; a digital representation of the 1974 P.B. King and H.M. Beikman map

This CD-ROM contains a digital version of the Geologic Map of the Conterminous United States compiled by Philip B. King and Helen M. Beikman of the U.S. Geological Survey. It excludes Alaska and Hawaii. The map was originally published in 1974 at a scale of 1:2,500,000. Although the digitized map can be displayed at different scales, the geology is not intended to be used at any scale larger than 1:2,500,000.The CD-ROM also contains the text and figures from Professional Paper 901 by the same authors. It describes the historical background of the map, details of the compilation process, and limitations to interpretation. The digital version of the text can be searched for key words and phrases.For DOS users, the CD-ROM contains a menu-driven operating system and MAPPER display software, a user-friendly map display package. Both raster image and vector versions of the geologic map can be displayed. The raster version is at 1-km resolution in the original Albers Equal Area projection. The vector version is stored unprojected in decimal degrees. Other thematic layers include cities, counties, States, and major roads.The geologic map is provided in the following additional formats:- Arc/INFO 6.1.1 Export- Digital Line Graph (DLG) Optional- Drawing Exchange File (DXF)- Map Overlay Statistical System (MOSS)