Geology and resource assessment of the Venezuelan Guayana Shield at 1:500,000 scale

The other 1:500,000-scale MF maps were reproduced photographically from electrostatic plotter output on clear mylar. The published digital formats include this CD-ROM and ARC/INFO Export files to be located on the World Wide Web on the Internet. The data in this CD-ROM are based on a mineral resource assessment of the Venezuelan Guayana Shield, conducted between 1987 and 1991 by the U.S. Geological Survey and Corporacion Venezolana de Guayana, Tecnica Minera, (USGS, 1993).

The Venezuelan Shield occupies about 415,000 sq km in the south and east part of Venezuela. The study area is bounded on the north by the Rio Orinoco. It includes all of the Territorio Federal Amazonas, Estado Bolivar, and part of Estado Delta Amacuro.

The original resource assessment publication USGS Bulletin 2062 consists of 121 pages of text and figures as well as eight full-color maps: Geographic Geologic and tectonic Bouguer gravity Two mineral-occurrence maps Side-looking airborne radar image Two permissive domain maps The side-looking airborne radar image and the Bouguer gravity map are not included in this CD-ROM. The geology layer from the 1993 Bulletin was revised and published as a series of MF and I maps.