Provenance Magnetic anomaly map from Atwater, T. (1970). Implications of plate tectonics for the Cenozoic tectonic evolution of Western North America. Geological Society of America Bulletin, 81(12), 3513-3536. Geological map from http://gallery.usgs.gov/photos/06_25_2010_hlc5FRq11Y_06_25_2010_0. Figures combined by Kim Kastens, with fair use claimed for reason of criticism and education.
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