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The subject of this volume is the diverse suite of carbonate rocks known collectively as the Magnesian Limestone, that was formed near the margins of shallow tropical seas during the last five or six million years of the Permian Period. These unique rocks have been studied for more than 160 years and the names of some of the early workers - Geinitz, Murchison, Phillips, Sedgwick, Sorby - would grace any geological hall of fame. Despite this formidable assault, and the efforts of a host of later workers, the Magnesian Limestone still retains many of its secrets.