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


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2013-05-16 14:06:21


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 Corporaci�n Venezolana de Guayana, T�cnica 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 R�o Orinoco. It includes all of the Territorio Federal Amazonas, Estado Bol�var, 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:GeographicGeologic and tectonicBouguer gravityTwo mineral-occurrence mapsSide-looking airborne radar imageTwo permissive [...]


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Conversion of the Venezuela maps to a computerized digital format was undertaken for the following reasons:1) The digital format facilitates the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, the maps on this disc are not intended to be used at any scale more detailed than 1:500,000.A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. Digital data on geology, geophysics, and geochemistry can be combined to create useful derivative products.2) The digital format was used to facilitate publication in both paper and electronic form. For the R�o Caura paper map publication (Brooks and others, 1995), digital images were sent to the Gerber plotter, a vector-to-film processor. 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.
Geology of the Venezuelan Guyana Shield at 1:500000 Scale
Geology of the Venezuelan Guyana Shield at 1:500000 Scale



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