Definitions and Limits of Triassic Stages and Substages: Suggestions Prompted by Comparisons Between North America and the Alpine-Mediterranean Region

  • E. T. Tozer
Conference paper
Part of the Schriftenreihe der Erdwissenschaftlichen Kommissionen book series (ERDWISSENSCHAFT, volume 2)


Suggestions are made regarding the conventions that govern the scope and interpretation of Triassic stages and substages. Different interpretations of the Anisian-Ladinian and Carnian-Norian boundaries are discussed. It is suggested that a twofold rather than threefold division of the Carnian be adopted on the grounds that there seems to be insufficient evidence that the Jul (“Middle Carnian”) is younger than the Cordevol (“Lower Carnian”). Pelson, Illyr, Fassan, Longobard, Cordevol (or Jul), Tuval, Alaun and Sevat substages are more or less adequately defined and will be useful for expressing correlations provided that agreement is reached regarding the definition of their boundaries. Intervals deserving formal designation for which no names are available are Lower Anisian and Lower Norian (sensu Silbekling and Tozer, 1968). Interpretation of Rhaetian in terms of the Marshi Zone, rather than the whole of the Kössen Beds, is recommended.


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Copyright information

© Springer-Verlag Wien 1974

Authors and Affiliations

  • E. T. Tozer
    • 1
  1. 1.Department of Energy, Mines and ResourcesGeological Survey of CanadaOttawaCanada

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