A SEDIMENTARY CYCLICITY IN EARLY ASBIAN (LOWER D1) LIMESTONES IN THE LLANGOLLEN DISTRICT OF NORTH WALES
- 1 March 1979
- journal article
- Published by Geological Society of London in Proceedings of the Yorkshire Geological and Polytechnic Society
- Vol. 42 (3) , 397-404
- https://doi.org/10.1144/pygs.42.3.397
Abstract
SUMMARY: Sedimentary cyclicity is recognised in the early Asbian (lower D1) limestones of the Llangollen district, North Wales. 14 to 15 cycles have been identified, each characterised by the alternation of two distinct lithologies. The lower phase, muddy bioclastic limestone rich in Daviesiella llangollensis, is succeeded by an upper phase of porcellanous limestone. The porcellanous limestones occasionally show subaerial features. Comparison with other areas suggests that this kind of cyclicity is commonly developed in early Asbian limestones.This publication has 7 references indexed in Scilit:
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