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New uppermost Cambrian U-Pb date from Avalonian Wales and age of the Cambrian-Ordovician boundary

Geological Magazine

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, , , , , , and

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Abstract

A crystal-rich volcaniclastic sandatone in the lower Peltura scarabaeoides Zone at Ogof-odi near Criccieth, North Wales, yields a U-Pb zircon age of 491 ?? 1 Ma. This late Late Cambrian date indicates a remarkably young age for the Cambrian-Ordovician boundary whose age must be less than 491 Ma. Hence the revised duration of the post-Placentian (trilobite-bearing) Cambrian indicates that local trilobite zonations allow a biostratigraphic resolution comparble to that provided by Ordovician graptolites and Mesozoic ammonites.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
New uppermost Cambrian U-Pb date from Avalonian Wales and age of the Cambrian-Ordovician boundary
Series title:
Geological Magazine
Volume
135
Issue:
3
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Magazine
First page:
303
Last page:
309