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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Abstracts of Papers: Late Cretaceous Radiometric Date from the Cypress Hills of Western Canada
Potassium-argon dating of biotite and sanidine in the basal bentonites of the Bearpaw sea on the west, north and east sides of the Cypress Hills indicates a rapid trangression of this sea 72-73 million years ago. Regression was initiated 68 m.y. ago to the west of the Cypress Hills and completed 66 m.y. ago to the east. At this time the Kneehills Tuff blanketed Alberta and this key horizon yields 65-66 m.y. dates over an immense area. This is the youngest Cretaceous data obtained in the Cypress Hills proper, though in less eroded marginal sections, coals of the Cretaceous-Tertiary transition contain bentonites that set the Cretaceous-Tertiary boundary at 63 m.y. ago.
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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES
University of Alberta, Edmonton
Copyright © 2004 by The Society of Canadian Petroleum Geologists. All Rights Reserved.
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