A systems-based lithostratigraphy for the Lower Palaeozoic Welsh Basin and adjoining region

Davies, Jeremy R.

A systems-based lithostratigraphy for the Lower Palaeozoic Welsh Basin and adjoining region

Davies, Jeremy R.. 2025 A systems-based lithostratigraphy for the Lower Palaeozoic Welsh Basin and adjoining region. Nottingham, UK, British Geological Survey, 256pp. (OR/25/018) (Unpublished)

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Abstract/Summary

This preliminary framework document presents an overview of the Ordovician and Silurian successions of the Lower Palaeozoic Welsh Basin (LPWB), adjoining parts of the Midland Platform and contiguous regions in south-west Wales. It seeks to rationalise disparate formational nomenclatures and advance a hierarchical lithostratigraphy for these strata and, in doing so, substantially revises and updates an unreleased draft by D. Wilson and J. R. Davies placed on file in 2012. It should be read in conjunction with the Stratigraphical Framework Report on the Ordovician volcanic successions of Snowdonia and the Llyn Peninsula by Rushton and Howells (1998) and the report on Old Red Sandstone of the Anglo-Welsh Basin by Barclay et al. (2015). Although this current report provides guidance on formational and member nomenclature, and cites their source documentation, it does not give full lithostratigraphical definitions; these may form the remit of future reports. It is important to understand that this report is a baseline statement that is capable of refinement and improvement with time. The report is in five parts: Part 1 explains the methodology used to develop a group and subgroup scale lithostratigraphical framework for the whole of the post-Tremadoc Ordovician to (?)Early Pridoli Silurian succession of the study area; Part 2 shows how this approach has been used to develop a new group and sub-group scale lithostratigraphy; Part 3 in addition to group and sub-group definitions, provides a comprehensive account of their component formations and members; Part 4 summarises and presents the principal recommendations arising from the study; and Part 5 includes the reference list and appendices. The report, though intended as a standalone document, is best read in conjunction with the relevant BGS 1:50 000 scale geological maps, memoirs and sheet explanations listed in Appendix 1. Text boxes are used to provide important background context for some of the key decisions relating to systems tract definitions and nomenclature.

Item Type:

Publication - Report

Funders/Sponsors:

British Geological Survey

Additional Information:

This item has been internally reviewed, but not externally peer-reviewed.

Date made live:

01 Sep 2025 10:49 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/540158