“…The lithosphere beneath the Western Canada Sedimentary Basin (WCSB) and northern Montana contains vital records of the Precambrian tectonic development of western Laurentia (Hoffman, ; Ross et al, ). While much of the basement is inaccessible to direct geological sampling due to extensive Phanerozoic sedimentation (e.g., Ross et al, ; Villeneuve et al, ), especially in southern Alberta and northern Montana near the Rocky mountain foredeep, geological (Hoffman, , ; O'Neill & Lopez, ; Pana, ; Sims et al, ; Sims et al, ), potential field (Boerner et al, ; Nieuwenhuis et al, ), geochemical (Aulbach et al, ; Buhlmann et al, ; Burwash et al, ; Chacko et al, ; Davis et al, ; Mueller & Frost, ; Ross et al, ; Villeneuve et al, ), and seismological (Bouzidi et al, ; Chen et al, ; Chen et al, ; Clowes et al, ; Eaton & Cassidy, ; Gu et al, , ; Gu & Shen, ; Ross et al, ; Schulte‐Pelkum et al, ) observations have provided compelling evidence for an intricate regional tectonic framework consisting of more than 20 Precambrian domains (Ross et al, ) and ancient bedrocks dating as far back as ~3.4 Ga (Mueller & Frost, ; Sims et al, ). Precambrian events in this region are highlighted by three proposed tectonic discontinuities, the east‐northeast trending Snowbird Tectonic Zone (STZ) across central Alberta, Vulcan Structure (VS) in southern Alberta, and Great Falls Tectonic Zone (GFTZ) in northern Montana (Figure a).…”