to Peace River. Relationship to other units Montney Formation is unconformably overlain by Jurassic or Cretaceous beds such as the Doig Formation or Fernie Group and unconformably underlain by the Permian or Carboniferous strata such as the Belloy Formation. References Shale formations Geologic formations of Alberta Stratigraphy of British Columbia Oil-bearing shales in Canada Natural gas fields in Canada Western Canadian Sedimentary Basin Early Triassic Triassic Alberta Triassic British Columbia Triassic System of North America