sideritic mudstone

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• Sandsend Ness — is an old alum quarrying site close to Whitby in North Yorkshire, England.Beneath extensive deposits of grey pyritic shale a thin band of sideritic mudstone is present at this site and there is a further 6 meters of almost non bituminous shale… …   Wikipedia

• Fort St. John Group — Stratigraphic range: Lower Cretaceous …   Wikipedia