About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Alberta Society of Petroleum Geologists News Bulletin
Vol. 1 (1953), No. 9. (September), Pages 7-7

Abstract: Cambrian and Ordovician of Southwestern Alberta

F. K. North

Through a period from Precambrian to Upper Devonian times the great trough of the Rocky Mountains area was separated from the Great Basin area of Utah and Nevada by the positive area Montania. The Lower Cambrian coarse clastics of Lake Louise area disappears at Moose Mountain, and from the Crowsnest area southward the Lower Cambrian is certainly absent. The Middle Cambrian is the most extensive formation. Its basal member rests directly on the Precambrian at places as far apart as the Wind River Canyon of Wyoming, the Lewis and Clarke Range of Western Montana, Waterton Park, and the Elko area of South-eastern British Columbia. Upper Cambrian deposits are absent from a belt stretching from the Snake River area of Idaho, northwards almost to the Crowsnest and (apparently) Westward to the Pacific. They are absent under the southwestern Alberta plains and in the front ranges of the Rockies as far north as Clearwater River. The Ordovician is almost a replica of that of the Upper Cambrian, with the obvious proviso that the remaining Ordovician is less extensive. The lithology of the known Cambrian beds suggests deposition in quiet basins on the flanks of an emergent mass of low relief.

Abstract by M. Fuglem P & N G Conservation Board

End_of_Record - Last_Page 7---------

Copyright © 2004 by The Society of Canadian Petroleum Geologists. All Rights Reserved.