A depositional model for the Mid-Westphalian A to late Westphalian B coal measures of South Wales

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Abstract

Mid-Westphalian A to late Westphalian B sediments of the South Wales Coalfield comprise mainly lacustrine, raised mire and flood deposits developed in an upper coastal plain environment. Occasional high sinuosity, fine-grained channel systems drained the subdued topography of the Wales-Brabant Massif to the north and east of the basin. Low sinuosity channels with lithic, coarse-grained fills drained a rising source to the south. Direct marine influence was restricted to a single marine band. Facies distributions were controlled by: 1) local scale (102-103 m2) autocyclic sedimentary processes, 2) regional scale (10 km2) synsedimentary fault activity and differential subsidence, and 3) basin-wide scale (102km2) response to changes in relative sea-level. -from Author

Original languageEnglish
Pages (from-to)1121-1136
Number of pages16
JournalJournal - Geological Society (London)
Volume150
Issue number6
DOIs
Publication statusPublished - 1 Jan 1993

ASJC Scopus subject areas

  • Geology

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