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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Special Guide Book Issue: Flathead Valley
Vol. 12 (1964), No. 2S. (August), Pages 512-535

The Lower Cretaceous of the Southeastern Canadian Cordillera

D. K. Norris

ABSTRACT

The Blairmore Group and Crowsnest Formation make up the bulk of the Lower Cretaceous non-marine succession in the southeastern Canadian Cordillera.

The Blairmore Group rests with regional disconformity on the Kootenay Formation in Alberta and on the Kootenay Formation and Elk Conglomerates in British Columbia. It is in gradational contact with overlying Crowsnest strata. The group may be divided into five lithologically distinct units according to the presence or absence of feldspar-rich sandstones, limestone and conglomerate. Some units are mappable over large areas and have formational status, e.g. the basal conglomerate, correlated with and hereafter termed the Cadomin Formation. The Crowsnest Formation consists predominantly of pyroclastic and epiclastic rocks with minor local flows. It interfingers with Blairmore Group and is overlain disconformably by shale, siltstone and pebble-conglomerate of the Upper Cretaceous Blackstone Formation.

Within the type area a principal reference section for the Blairmore Group is proposed on Ma Butte 6 miles north of Coleman, Alberta, and for the Crowsnest Formation on Iron Ridge 1 mile west of Coleman.


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