Eric D. Anderson Carol A. Finn 2015 <p>Aeromagnetic and radiometric data were used to map shallow Precambrian basement lithology and structure and determine the depth to magnetic basement, which in most cases, corresponds to the depth to crystalline basement of interest for mineral exploration. These depths, along with those determined from gravity data, help identify basins with hydrologic potential. In addition, the magnetic data were used to identify buried Precambrian rocks of unknown affinity.</p> application/pdf 10.3133/ofr20131280B en U.S. Geological Survey Synthesis of geophysical data (phase V, deliverable 55) reports