Ordovician to Devonian sea-level changes in western and northern Canada

Lower Paleozoic sediments of central, Cordilleran, and arctic Canada are dominated by two megafacies: supratidal to shallow subtidal carbonates and minor evaporites of the platformal (cratonic) areas, and deeper water dark shales and dark limestones of the slope and basinal areas. Large areas of the platform may be covered or exposed in response to relatively small changes in sea level, whereas sea-level changes in the slope and basinal areas...