The Geological Survey of Canada (GSC), U.S. Geological Survey (USGS), and Consejo de Recursos Minerales of Mexico (CRM) are compiling an upgraded digital magnetic anomaly database and map for North America. This trinational project, expected to be completed by late 2002, will replace the Magnetic Anomaly Map of North America constructed as part of the Geological Society of America's Decade of North American Geology (DNAG) program. The U.S. component of the DNAG map consists of a digitized version of the first analog magnetic map for the U.S. produced by Zietz (1982). The Canadian part is based on a 2-km grid...

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