J. Myers; Wall Grange brickyard, Staffs. Geological Magazine ; 88 (4): 297–298. doi:
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The finding of both the Gastrioceras cancellatum and G. cumbriense bands in the quarry at Wall Grange, near Leek, Staffordshire, England, indicates that the capping grit is the Rough Rock, or First Grit, of upper Carboniferous age.
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