Composite stratigraphic section of exceptionally exposed middle Bylot Supergroup carbonate rocks along Tremblay Sound, northwestern Baffin Island, Nunavut

Over the course of this project, nine stratigraphic sections of the ~1050 Ma middle Bylot Supergroup in the Borden Basin
were measured, logged and sampled from five camps set up along Tremblay Sound, northwestern Baffin Island, Nunavut.
Together, these provide a nearly continuous composite stratigraphic section ~1700 m thick of the carbonate-dominated Iqqittuq, Angmaat, Victor Bay and Athole Point formations. This study broadly confirms previous depositional interpretations of the Borden Basin. In addition, this remarkably complete composite stratigraphic section along Tremblay Sound contains an unusually thick section of the Athole Point Formation that preserves a tuff bed. Samples from this composite section will be used in future geochemical, paleontological and geochronological investigations to gain a better understanding of the geological history of the Bylot Supergroup, and to characterize the depositional environments and biological diversity near the 1000 Ma Mesoproterozoic-Neoproterozoic transition.