Bulletin of the United States Geological Survey

aeromagnetic reconnaissance Andreasen Arctic Ocean basement rocks belt beneath the Yukon Brabb broad anomalies Brooks Range Brosgé CALIFOR CALIFORNIA Cenozoic Chandalar River coincides Detailed aeromagnetic maps DIEGO LIBRARY distinctive magnetic character East Fork east-west extend flight lines gammas per mile Geologic Interpretation geologic map pl geophysical gradient Grantz Interpretation of Reconnaissance Kandik linear low magnetic relief mafic rocks magnetic contour map magnetic data MAGNETIC FEATURES magnetic high Magnetic patterns magnetic rocks map on pl Mesozoic age metamorphic rocks mineral negative anomaly nonmarine north-south north-trending faults northeastern Alaska Ogilvie Mountains ORNIA outcrops Payne Porcupine Plateau Porcupine River Precambrian Reconnaissance Aeromagnetic Survey reconnaissance of northeastern rocks beneath rocks of Mesozoic rocks of Paleozoic Ruby uplift SAN DIEGO schist sedimentary basin sedimentary rocks serpentine shown on plate SPECIFIC ANOMALIES SURVEY OF NORTHEASTERN terrane Tindir Group Tintina fault zone Tintina Valley trend U.S. Geological Survey ultramafic UNIVERSITY volcanic rocks Woolson Yukon-Tanana Upland