Middle Proterozoic piggyback basin in the subsurface of northwestern Canada
Seismic reflection profiles from the interior platform in the northwestern Canadian Arctic show outstanding evidence for sedimentary basins formed and carried "piggyback" on thrust sheets during Middle Proterozoic compressional deformation. The seismic stratigraphic observations are the first documentation of a Proterozoic piggyback basin and thus also provide independent confirmation of proposed layer-parallel thrusting.