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Basic intrusions in the Ordovician of North Wales—geochemical data and tectonic setting

✍ Scribed by P.A. Floyd; G.J. Lees; R.A. Roach

Book ID
114035783
Publisher
The Geological Society (London)
Year
1976
Tongue
English
Weight
603 KB
Volume
87
Category
Article
ISSN
0016-7878

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Graptolite dating of Ordovician vulcanic
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✍ 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