Cabox Geopark surrounds the Bay of Islands (Mi’kmaq indigenous name Elmastukwek) in Western Newfoundland and contains three of the four massifs of the globally significant Bay of Islands Ophiolite Complex, which displays a complete section of oceanic lithosphere from upper mantle to ocean-floor sediment. To the west, the Little Port Complex represents a Cambrian island arc, the oldest evidence of subduction in the Iapetus Ocean. Beneath the oceanic units, sedimentary units of the Humber Arm Supergroup record the Ediacaran to Ordovician continental slope and rise of Laurentia, in turn thrust over a shelf succession recording shallow marine facies spanning the same time interval. The thrust stack records Ordovician arc continent collision and is overprinted by structures generated after subduction polarity reversal and Devonian continental collision during the building of Pangea. These structures are revealed by a classic history of Quaternary glacial erosion, followed by isostatic rebound.