Describes the geology of an area covering about 82,000 square kilometres in north central Baffin Island, beginning with an introduction on the area's location, access, physiography, climate, general geology, and previous studies. Subsequent chapters cover the geology of the Archean to Cretaceous and Recent formations, regional geochemistry, regional geochronology, regional & contact metamorphism, economic geology, and structural geology. The final chapter is a regional synthesis with general comments on structural subdivisions, the nature of their boundaries, regional correlations, and geological history.