Journal article
New uppermost Cambrian U–Pb date from Avalonian Wales and age of the Cambrian–Ordovician boundary
Geological magazine, Vol.135(3), pp.303-309
05/1998
DOI: 10.1017/S0016756898008711
Abstract
A crystal-rich volcaniclastic sandstone in the lower Peltura
scarabaeoides Zone at Ogof-ddû
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 comparable to that provided
by Ordovician graptolites and Mesozoic ammonites.
Details
- Title: Subtitle
- New uppermost Cambrian U–Pb date from Avalonian Wales and age of the Cambrian–Ordovician boundary
- Creators
- K Davidek - Massachusetts Institute of TechnologyE Landing - New York State Geological Survey, The State Education Department, Albany, NY 12230, USAS. A Bowring - Massachusetts Institute of TechnologyS. R Westrop - Brock UniversityA. W. A Rushton - British Geological SurveyR. A Fortey - American Museum of Natural HistoryJ. M Adrain - American Museum of Natural History
- Resource Type
- Journal article
- Publication Details
- Geological magazine, Vol.135(3), pp.303-309
- Publisher
- Cambridge University Press
- DOI
- 10.1017/S0016756898008711
- ISSN
- 0016-7568
- eISSN
- 1469-5081
- Number of pages
- 7
- Language
- English
- Date published
- 05/1998
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984229304902771
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