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Wales and the Ordovician System

โœ Scribed by RICHARD FORTEY


Book ID
114728576
Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
219 KB
Volume
7
Category
Article
ISSN
0266-6979

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๐Ÿ“œ SIMILAR VOLUMES


Ordovician ignimbrites in the Berwyn Hil
โœ P. J. Brenchley ๐Ÿ“‚ Article ๐Ÿ“… 1964 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 849 KB

Two ignimbrite horizons are recognised in a Caradoc marine sequence. The uppermost, the Pandy Ash forms a single mappable unit, but is shown to consist of at least three separate flows, including both welded and non-welded tuffs. Locally lahars occur.

Age and controls of ironstone deposition
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Post-Arenig ironstones and associated sediments of North Wales have yielded Upper Llanvirn, Llandeilo and Lower Caradoc acritarch assemblages. The occurrence of most ironstones coincides with a eustatic regression and subsequent transgression, and the emergence to the northwest of the Irish Sea Land

The ordovician (caradoc) volcanic rocks
โœ R. J. Dixon ๐Ÿ“‚ Article ๐Ÿ“… 2007 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 594 KB

The Ordovician (Caradoc, Soudleyan) rocks of Montgomery, Powys are shales interbedded with locally conglomeratic volcanjclastic sediments composed of andesitic detritus. New formal lithostratigaphic units are proposed: Montgomery Volcanic Group comprising in ascending order: Castle Hill Shale Format

Late Ordovician stratigraphy northwest o
โœ D. M. D. James ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 643 KB

Several modifications are proposed to the Ordovician stratigraphy recently proposed by Mackie and Smallwood (1 987), based in particular on the recognition of a major Mynydd Trawsnant anticline on the northwest flank of the Tywi structure and on field relationships indicating the Foel Formation dire