Stratigraphy of the Lower Part of the Belt-Purcell Supergroup (Middle Proterozoic) in the Lewis Thrust Sheet of Southern Alberta and British Columbia
Fermor PR and Price RA. 1983. Stratigraphy of the Lower Part of the Belt-Purcell Supergroup (Middle Proterozoic) in the Lewis Thrust Sheet of Southern Alberta and British Columbia. Bulletin of Canadian Petroleum Geology. 31(3):169-194
Detailed mapping in the northern part of the Clark Range salient of the Lewis thrust sheet has led to a revision of stratigraphic correlations across the width of the thrust sheet, and has shown that marked facies changes occur within formations near the base of the Lewis thrust sheet. Strata immediately above the Lewis thrust, exposed around two windows through the Lewis thrust sheet in southeastern British Columbia, previously were correlated with the Waterton Formation, which had been considered the lowest unit within the thrust sheet. The strata immediately above the Lewis thrust are now shown to occupy a stratigraphic position below the Waterton Formation. Two new units, the Haig Brook Formation and the Tombstone Mountain Formation, are proposed for the stratigraphic interval between the Lewis thrust and the redefined base of the Waterton Formation. Strata in the hangingwall of the Lewis thrust that were penetrated by the Pacific-Atlantic Flathead No. 1 well, 20 km southeast of the windows, represent new units that are stratigraphically lower than the Tombstone Mountain and Haig Brook Formations, and comprise the lowest stratigraphic units known from the Clark Range salient of the Lewis thrust sheet.
- Type
- Journal Article
- Authors
- Fermor, Peter; Price, Raymond
- Units
- CRCO , GLAC , WALA
- Keywords
- Alberta, Altyn Limestone, Belt-Purcell Supergroup, British Columbia, carbonate rocks, Clark Range, clastic rocks, correlation, Haig Brook Formation, Lewis Thrust Sheet, lithofacies, lithostratigraphy, Mesoproterozoic, Precambrian, Proterozoic, sedimentary rocks, stratigraphy, Tombstone Mountain Formation, upper Precambrian, Waterton Formation, Windermere Supergroup