✦ LIBER ✦

Ordovician ignimbrites in the Berwyn Hills, north Wales

✍ Scribed by P. J. Brenchley

Book ID: 102846254
Publisher: John Wiley and Sons
Year: 1964
Tongue: English
Weight: 849 KB
Volume: 4
Category: Article
ISSN: 0072-1050
DOI: 10.1002/gj.3350040104

No coin nor oath required. For personal study only.

✦ Synopsis

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.

📜 SIMILAR VOLUMES

Structural arcuation in the Berwyn Hills

Structural arcuation in the Berwyn Hills, North Wales

✍ M. A. Awan; N. H. Woodcock 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 697 KB

## Abstract New mapping has better defined the well known arc in Acadian (late Caledonian) structures centred in the Berwyn Hills. This arc, convex to the north‐west and about 20 km across, is defined by the strikes of bedding and cleavage and the trends of fold hinges. In contrast, a mineral linea

A white mica crystallinity study of the

A white mica crystallinity study of the Berwyn Hills, North Wales

✍ M. A. AWAN; N. H. WOODCOCK 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 788 KB

Graptolite dating of Ordovician vulcanic

Graptolite dating of Ordovician vulcanicity in the Arenig area, North Wales

✍ Jan Zalasiewicz 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 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

Notes on a temporary section in the ordo

Notes on a temporary section in the ordovician at Conway, north Wales

✍ D. S. Wood; J. C. Harper 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 660 KB

## Abstract Black graptolitic shales of approximately __D. clingani__ age were seen resting on flaggy beds with an Upper Longvillian fauna, which are taken to belong to the Upper Ash Group of Elles. This section conflicts with the details published concerning the nearby Conway railway cutting and a

Structure of the Ordovician succession a

Structure of the Ordovician succession around Aberdaron, southwest Llŷn, North Wales

✍ T. R. W. Hawkins 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 687 KB

Age of the ordovician andesitic conglome

Age of the ordovician andesitic conglomerate of castle hill, Montgomery, Powys, Wales

✍ R. Cave; W. T. Dean; B. A. Hains 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 718 KB

Marine fossils including Broeggerolithus broeggeri (Bancroft) and Salterolithus caractaci (Murchison) collected from strata surrounding the andesitic conglomerate of Castle Hill, Montgomery prove that the volcanic event which produced it, and possibly also the andesite of Moel-y-Golfa 10 miles to th