Stratigraphy, structure and tectonic history of the Pink Mountain Anticline, Trutch (94G) and Halfway River (94B) map areas, northeastern British Columbia

Pink Mountain Anticline stands out in front of the Foothills of northeastern British Columbia (57°N, 123°W). Geologic mapping and prestack depth-migrated seismic sections show that it is localized above and west of a northwest-trending subsurface normal fault. Along with isopach maps they demonstrate episodic normal movement during deposition of the Carboniferous Stoddart Group, Triassic Montney Formation and possibly the Jurassic-Cretaceous Monteith-Gething formations. West of this step, during Laramide compression, a pair of backthrusts nucleated on either side of a minor east-west trending Carboniferous fault and propagated across it in an en échelon pattern. One backthrust ramped laterally across the area and separated the Pink Mountain and Spruce Mountain structures, which both are contained within a 30+ km long pop-up structure above the Besa River Formation detachment.; Glomerspirella fossils confirm the existence of the Upper Jurassic Upper Fernie Formation and Upper Jurassic to Lower Cretaceous Monteith Formation at Pink Mountain.