The Gascoyne Complex is separated from the Yilgarn Craton to the south by a major fault, the Errabiddy Shear Zone. To the east and northeast rocks of the complex are overlain unconformably by fine-grained Mesoproterozoic sedimentary rocks of the Edmund Basin and Collier Basin (formerly known as the Bangemall Basin). Several inliers of granite within these sedimentary basins also belong to the Gascoyne Complex. To the west, the Gascoyne Complex is overlain unconformably by sedimentary rocks of the Phanerozoic Carnarvon Basin. To the north, schist of the Gascoyne Complex probably pass with decreasing intensity of metamorphism into metamorphosed sedimentary rocks of the upper Wyloo Group.