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The Great American Bank, deposited along the Cambro-Ordovician coast of Laurentia, consists of over 3000 m of carbonate deposits. Middle Cambrian Ledger Formation dolomitized ooid shoals and partially dolomitized microbial reefs, exposed in the Magnesita Refractories quarry (York, Pennsylvania), formed on the shelf margin [de Wet, Dickson, Wood, Gaswirth, Frey, 1999, “A new type of shelf margin deposit: rigid microbial sheets and unconsolidated grainstones riddled with meter-scale cavities,” Sedimentary Geology vol. 128, pp. 13-21; de Wet, Frey, Gaswirth, Mora, Rahnis, Bruno, 2004, “Origin of meter-scale submarine cavities and herringbone calcite cement in a Cambrian microbial reef, Ledger...

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