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 database was developed to provide a GIS of the geologic map of the State
of Arizona for use at a scale of 1:500,000 or smaller. 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). The digital geologic map
database can be queried in many ways to produce a variety of derivative
geologic maps.

This GIS database consists of 4 Arc/Info data sets: one line and polygon file
(azgeol) containing geologic contacts and structures (lines) and geologic map
rock units (polygons), one line file (azfold) containing the folds and crater
boundaries, one point file (azptfeat) containing geologic features, cinder
cones and diatremes. one point file (azptdec) containing decorations, and