[en] The results of a high-sensitivity, aerial, gamma-ray spectrometer and magnetometer survey of the Twin Falls Quadrangle, Idaho, are presented. Instrumentation and methods are described in Volume 1 of this final report. This work was done by Texas Instruments Incorporated under Bendix Field Engineering Corporation Subcontract No. 78-184-L as part of the US Department of Energy National Uranium Resource Evaluation (NURE) Program. Statistical and geological analysis of the radiometric data revealed 21 uranium anomalies worthy of field-checking as possible prospects. The Tertiary Idavada volcanics show the greatest potential as possible source rocks for uranium. Eleven anomalies may be indicative of possible uranium prospects in this unit. Caution was exercised in the interpretation of anomalies in the Twin Falls Quadrangle; soils in this area contain a thin layer of uranium-rich volcanic ash, sandstone interbeds in basalts may cause anomalies, windows in the basalts may expose silicic volcanics, and nonstandard geometry over narrow canyons may give rise to apparent anomalies when altitude corrections are applied. Therefore, only strong anomalies were considered significant. Six significant anomalies are associated with Quaternary or Tertiary basalts, one is related to Tertiary lake and stream deposits, and three pertain to Quaternary deposits