Petrological studies of igneous rocks are carried out to gain a better understanding of the geological evolution and economic potential of particular regions. The Meguma Terrane in mainland NS consists primarily of peraluminous granitoid plutons which intrude Cambro-Ordovician metasedimentary rocks of the Meguma Group. Interest in granitoid plutons has been stimulated in recent years by the discovery of granite-hosted mineralization such as the East Kemptville tin deposit. Two segments of the eastern Meguma Terrane, the Canso and Forest Hill regions, were selected for an integrated program involving mapping, structural analysis, petrography, geochemistry and isotopic investigation. This report presents the results of the program.