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A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man

By A.A. McMillan, R.J.O. Hamblin and J.W. Merritt

Abstract

This report presents the proposed BGS lithostratigraphical\ud framework for the onshore Quaternary and Neogene\ud (Tertiary) superficial deposits of Great Britain (England,\ud Scotland and Wales) and the Isle of Man. The objective\ud of the report is to provide a practical framework to aid\ud future Quaternary correlation, mapping and research, and a\ud stratigraphical scheme capable of use in a wide variety of\ud applications. An overview of the framework was published\ud by McMillan et al. (2005).\ud A framework that utilises the full hierarchy of the stratigraphical\ud code (supergroup, group, subgroup, formation\ud and smaller units) is proposed. Although the framework is\ud built around the formation, the primary unit for mapping\ud and correlation, it is recommended that some classes of\ud lithogenetically-defined deposits are not accorded formational\ud status. However, at group level the scheme\ud embraces all Quaternary and Neogene (Tertiary) superficial\ud deposits, thus enabling a coded lithostratigraphical\ud superscript to be applied to every Quaternary map symbol\ud defined in the BGS Specifications for the preparation of\ud 1:10 000 scale geological maps (Ambrose, 2000). The\ud map specifications are based upon the lithogenetic classification\ud of Quaternary deposits, as outlined in BGS Rock\ud Classification Scheme (RCS) for artificial and natural\ud superficial deposits (McMillan and Powell, 1999). In parts\ud of Great Britain lithostratigraphical mapping at formation\ud level can be regarded only as a long-term objective.\ud Products such as lithostratigraphical maps, cross-sections\ud and three-dimensional models may therefore be regarded\ud as an evolving layer in the geological model.\ud The unified lithostratigraphical framework for onshore\ud Quaternary deposits is designed to be of use for regional\ud mapping and correlation and may also be of relevance for\ud regional hydrogeological and geotechnical applications.\ud For example the lithostratigraphical classification can be\ud used to enhance geological and hydrogeological domains\ud maps and models depicting landform–sediment associations\ud (McMillan et al., 2000).\ud The current report is based upon a review of published\ud literature (including BGS geological maps and reports), and\ud expert local knowledge. Extensive reference is made to the\ud Geological Society (London) Special Report No. 23 — A\ud revised correlation of Quaternary deposits in the British\ud Isles (Bowen, 1999)

Publisher: British Geological Survey
Year: 2011
OAI identifier: oai:nora.nerc.ac.uk:14531

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