Lyell Collection
Geological Society, London, Special Publications
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Smith, D. B.
Right arrow Search for Related Content
Geological Society, London, Special Publications; 1964; v. 1; p. 211-220;
DOI: 10.1144/GSL.SP.1964.001.01.20
© 1964 Geological Society of London

Part 4: Stratigraphical Review

The Permian period

Denys Barker Smith, B.SC., F.G.S.

Geological Survey Office, Ring Road, Halton, Leeds 15

Twelve rocks for which calculated isotopic ages are mutually consistent and for which there is some biostratigraphic control have been used in the construction of a Permian time-scale. On the evidence of these rocks it is suggested that the Permian period lasted from about 280 m.y to about 225 m.y. ago, with the Lower Permian–Upper Permian transition at about 240 m.y. Ages are also suggested for the remaining intra-Permian stage boundaries.