DNAG: Decade of North American Geology

Magnetic Anomaly Map of North America: DNAG

In the early 1980's, the USGS spearheaded the first effort to produce a magnetic map for the United States (Zietz, 1982). Although this map was assembled entirely in analog form, it represented the first qualitative view of continental-scale features. A digitized version of this map constitutes most of the data for the conterminous United States in the 1987 Magnetic Anomaly Map of North America (Committee for the Magnetic-Anomaly Map of North America, 1987), constructed as part of the Geological Society of America's Decade of North American Geology (DNAG) program.

Reference: Zietz, I., 1982, Composite magnetic anomaly map of the United States; Part A, Conterminous United States: U.S. Geological Survey Investigations Map GP-954-A, 59 pp., 2 sheets, scale 1:2,500,000.