The succession studied marks the transition from marine carbonate deposition of the Carboniferous Limestone to the marine mud and sand deposition of the Millstone Grit, and includes a deep shelf or upper slope facies consisting mainly of bioclastic and subordinate crinoidal calcarenites, a lagoonal facies of coquina-lutites with shelly calcite mudstones and calcite siltstones and clay shales, and a shallow shelf facies of quartzose sandstones with varying amounts of bioclastic debris and interbedded silty shales.

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