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  • ...formal supergroup), and in southern Britain comprises a thick sequence of limestone, dolomite and subordinate siliciclastic strata. They were deposited followi ...1 [8338 7071]). This borehole proved 90.5 m of probable Carboniferous Limestone underlying the Penarth Group, but beyond this its eastern extent and struct
    17 KB (2,541 words) - 14:53, 2 December 2015
  • ...bedded limestone with chert (Arundian) overlain by thick-bedded pale grey limestone (Holkerian) (MFH P662424).]] ...overlain by largely marine strata of the Avon Group (previously the Lower Limestone Shale Group, and, in Gower, the Cefn Bryn Shales) at the base of the Carbon
    15 KB (2,153 words) - 10:53, 5 May 2016