Low-grade metamorphosed sedimentary rocks south-west of Corner Brook, Newfoundland, form part of a complex foreland fold-and-thrust belt that deformed lower Palaeozoic rocks of the Laurentian margin. Cambro-Ordovician carbonate shelf rocks and coeval deeper-water rocks of the Pinchgut Lake group were carried together north-westward on a major thrust above terrigenous foreland-basin rocks. Mapping outlines a major, northeast-trending and plunging antiformal stack lying between the Humber Arm Allochthon to the west and higher grade metasedimentary and basement-cover domains to the east. This report describes the lithostratigraphy of the carbonate sequence and the Pinchgut Lake group, details the main structural elements of the area, compares the area to other map areas of western Newfoundland, and discusses both lithostratigraphic and structural implications. Finally, it documents the economic potential of the area, focusing on the area's significant variety of marbles.