𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Basin development in North Wales during the Arenig

✍ Scribed by A. J. Beckly

Book ID
102845343
Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
736 KB
Volume
22
Category
Article
ISSN
0072-1050

No coin nor oath required. For personal study only.

✦ Synopsis

Refined biostratigraphy for the Arenig Series has permitted the use of the three stages recognized in South Wales, and hence the recognition of structurally-bounded areas of North Wales with substantially different depositional histories. During the Moridunian and Whitlandian, continuous subsidence was restricted to the western margin of the present mainland, and in many areas deposition did not commence until the Fennian. Volcanics, mass flow deposits, and synsedimentary deformation indicate two minor phases of tectonic activity. Late in the Moridunian, uplift around the Harlech Dome caused the absence of the Whitlandian. During the Fennian rapid fault-controlled subsidence occurred in the west allowing the incursion of an open ocean biofacies.

πŸ“œ SIMILAR VOLUMES

Graptolite dating of Ordovician vulcanic
Graptolite dating of Ordovician vulcanicity in the Arenig area, North Wales
✍ Jan Zalasiewicz πŸ“‚ Article πŸ“… 1992 πŸ› John Wiley and Sons 🌐 English βš– 722 KB

Graptolite assemblages of multidens Biozone age have been recovered from mudstones immediately above and below the Llyn Conwy Formation, the local representative of the regionally extensive acid tuffs that mark the end of vulcanicity in the south and east of the Harlech Dome. They include several ta

Loch Lomond Stadial glaciers in the Aran
Loch Lomond Stadial glaciers in the Aran and Arenig Mountains, North Wales, Great Britain
✍ Philip D. Hughes πŸ“‚ Article πŸ“… 2002 πŸ› John Wiley and Sons 🌐 English βš– 191 KB

## Abstract Geomorphological evidence for four former local glaciers has been mapped in the Aran and Arenig Mountains, North Wales. Former glacial extent was deduced from the distribution and assemblage of end and lateral moraines, hummocky moraine, boulder limits, drift limits and periglacial trim

Regional variations in cleavage and fold
Regional variations in cleavage and fold development in North Wales
✍ S. D. G. Campbell; A. J. Reedman; M. F. Howells πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 603 KB

The arcuate pattern of the main Caledonian cleavage and associated fold axial plane traces in North Wales is due partly to NW-SE compression with tectonic transport to rhe southeast against the concealed crop of the Tan y grisiau Microgranite. Low-angle cieavage close to the microgranite is shown to