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Precambrian rocks in Anglesey, southwest Llŷn and southeast Ireland

By
W. Gibbons
W. Gibbons
Department of Geology, University of Wales, Cardiff CF1 3YE, UK
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D. Tietzsch-Tyler
D. Tietzsch-Tyler
Geological Survey of Ireland, Beggars Bush, Haddington Road, Dublin 4, Ireland.
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J. M. Horák
J. M. Horák
Department of Geology, National Museum of Wales, Cardiff CF13NP, UK
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F. C. Murphy
F. C. Murphy
ERAIMaptec, Level 1, 371 Queen Street, GPO Box 1996 Brisbane Q4001, Australia.
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Published:
January 01, 1994

Abstract

This chapter deals with the oldest rocks that crop out at opposite ends of a narrow belt running southwest from the island of Anglesey in North Wales across the Irish Sea to the southeasternmost corner of Ireland. Between these two outcrop areas, exposures similar to some of those in Anglesey are found on the Welsh mainland along the southwestern margin of the Llŷn Peninsula (Fig. 24). In Wales, since the work of Blake (1888), Greenly (1919) and Matley (1928), these rocks have been referred to as Monian. In Ireland, following work by Baker (1955, 1969, 1970), the exposures have been placed within either the Rosslare Complex or the Cullenstown Formation. Although many previous publications have assumed a Precambrian age for all of these rocks, it is likely that they include some Cambrian rocks. In particular, the sediments that comprise the Cullenstown Formation, correlated with Monian sediments exposed in western Anglesey, are now interpreted as Cambrian (Tietzsch-Tyler & Phillips 1989; Bennett et al. 1989). Nevertheless, given the uncertainty that exists over both the absolute age of many rocks in these areas, and of the Precambrian-Cambrian boundary in general, all Monian and Rosslare/Cullenstown exposures have been included in this rewritten Special Report.

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Geological Society, London, Special Reports

A revised correlation of Pre-Cambrian rocks in the British Isles

W. Gibbons
W. Gibbons
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A. L. Harris
A. L. Harris
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Geological Society of London
Volume
22
ISBN electronic:
9781786202857
Publication date:
January 01, 1994

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