National Petroleum Reserve Alaska: Aerial Gamma Ray and Magnetic Survey data; USGS

The U.S. Geological Survey (USGS) began some geological surveying in this area in the eary 1900's, and the U.S. Navy began geological and geophysical surveys and drilling in 1945 to appraise the petroleum potential of the Reserve. Information on surveys prior to 1955 may be obtained from the Branch of Alaskan Geology, Alaska Technical Data Unit, Mail Stop 48, U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025.

AERIAL GAMMA RAY AND MAGNETIC DATA Radiometric and magnetic profiles from 1977 are available from USGS. Aerial data were recorded at 1-sec intgervals from a helicopter about 800 feet above the terrain with average ground speed of 100m/hr. Included with the data set are 5 index maps, 2 record location maps, 2 residual total magnetic-field profile maps, and an interpreted depth-to-basement map.