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Geological Society, London, Special Publications; 1964; v. 1; p. 207-209;
DOI: 10.1144/GSL.SP.1964.001.01.19
© 1964 Geological Society of London

Part 4: Stratigraphical Review

The Triassic period

Edward Timothy Tozer, M.A., PH.D.

Geological Survey of Canada, Department of Mines and Technical Surveys, Ottawa, Canada

Little information is available that can be used with confidence to construct a Triassic time-scale. The base of the system is variously dated in the range 220 to 238 m.y.; the age of the boundary with the Jurassic is also uncertain, but may be placed at about 190 to 200 m.y Apart from a Russian determination giving a minimum age of 200 m.y. for the Middle Triassic, the only radiometric data available are for the Upper Triassic.