 of 0000, Aero Service Division Western Geophysical Company of America conducted an airborne high sensitivity gamma-rayspectrometer and magnetometer survey over ten (00) areas over northern California and southwestern Oregon. These include the 0 0 x 0 0 NTMS quadrangles of Roseburg, Medford, Weed, Alturas, Redding, Susanville, Ukiah, and Chico along with the 0 0 x 0 0 areas of the Coos Bay quadrangle and the Crescent City/Eureka areas combined. This report discusses the results obtained over the 