Various shots of Canadian Government geological survey parties in Canadian Shield, of helicopter landing at survey camp, supplies being unloaded, geologists travelling across lake in inflatable boat with motor attached, of two geologists examining rocks with various instruments and taking rock samples in field. MCSs of helicopter on ground, rotor blades turning. GROUND TO AIR SHOTs of helicopter passing overhead. Numerous AIR TO AIR SHOTs of airborne magnetometer attached by communication line to Northstar airplane flying over water and land areas. Several CSs of computer-fed electronic map plotter in operation. Various shots of geologists working in mobile laboratory. CSs of trilobites (fossil; extinct arthopod characterized by a three lobed body).