John Challinor; New evidence concerning the original order of deposition of the Longmyndian rocks. Geological Magazine ; 85 (2): 107–109. doi:
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A new quarry in the pre-Cambrian Longmyndian rocks of Haughmond hill, Shropshire, England, shows clearly the lithologic variation from basal sandstone to overlying shale in each bed, enabling determination of their relative age.
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