Aeromagnetic map of the Las Vegas region. Warm colors indicate magnetic highs; cool colors, magnetic lows. Small black crosses indicate magnetization boundaries using the maximum horizontal gradient method. LVVSZ, Las Vegas Valley Shear Zone. White lines, faults. Magenta lines outline outcrops of Cenozoic volcanic rocks; black lines, pre-Cenozoic rocks. For an explanation of the application of the Earth's magnetic field to geology, see the magnetism section of the USGS Open-File Report 95-479).

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Last modified 5/29/2007