Preliminary Map No. 31: Geology of the Crowsnest Coalfield (Northeast Part) (NTS 082G/7, 10)
View Map (PDF, 18 MB) (1:10 000)
Preliminary Map 31 presents the geology of the northeast part of the Crowsnest Coalfield in southeastern British Columbia. The Preliminary Map consists of 3 sheets. Each is a 1:10 000 scale geological map with legend, explanatory notes and sections through the coal measures showing coal seams.
The maps show the distribution of coal seams of the Jurassic-Cretaceous age Kootenay Formation in the vicinity of Mount Taylor at the north end of the southern Dominion Coal Block. The coal measures, which occur between the basal sandstone and the overlying Blairmore Group on the east side of Mount Taylor, are approximately 500 metres thick. To the south of Leach Creek, this interval occupies 180 metres with only two coal seams. Here the East Crop fault, a low angle normal fault, has evidently displaced about two-thirds of the succession.
The rank of the coal has been measured. In the Leach Creek area, high-volatile bituminous coals are separated across the East Crop fault from low-volatile coals. All medium-volatile coals have been displaced on the fault. The rank of the coals decreases northward over the Barnes anticline, so that on the east side of Michel Head, the seam overlying the basal Moose Mountain sandstone is of medium-volatile rank.
Seam correlation on the west side of Mount Taylor is difficult because there is a normal fault with downthrow to the east.
The area is structurally complex. The dominant feature of the area is the East Crop fault, the throw of which increases toward the south. The Barnes anticline is a major structural slip fold that affects the coal measures in the Michel Ridge area. Thrusting repeats both coal measures and the basal Moose Mountain sandstone at the north end of Michel Head.
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