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  • ...tions. At the top is grey mudstone of Tremadoc (early Ordovician) age, the Merevale Shale Formation, which has a remarkably wide subsurface distribution in central and eastern
    11 KB (1,758 words) - 16:01, 28 July 2015
  • | MEREVALE SHALE FORMATION
    15 KB (1,753 words) - 09:30, 8 March 2016