Digital Geologic Map of Arizona: A Digital Database Derived from the 1983 Printing of the Wilson, Moore, and Cooper 1:500,000-scale Map, USGS OFR 00-409

This GIS is intended for use in future spatial analysis by a variety of users. The geologic unit descriptions for this map may be updated to reflect more current description of structures and the geochronology of the map units.

This database is not meant to be used or displayed at any scale larger than 1:500,000 (e.g., 1:100,000 or 1:24,000) The Geologic Map of Arizona was compiled at a scale of 1:500,000 by Eldred D. Wilson, Richard T. Moore and John R. Cooper, in 1969 and reprinted in 1977, 1981, and 1983. Comparison of an acetate copy of the 1983 map with existing paper copies of earlier maps shows some updating of the original by 1983. This 1983 acetate was scanned and vectorized by Optronics Specialty Co., Inc. in 1998, and put into an Arc/Info geographic information system (GIS).