New uppermost Cambrian U-Pb date from Avalonian Wales and age of the Cambrian-Ordovician boundary
Geological Magazine
By: K. Davidek, E. Landing, S.A. Bowring, S. R. Westrop, A.W.A. Rushton, R.A. Fortey, and J.M. Adrain
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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.
| 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 |
| Google Analytic Metrics | Metrics page |