Recent information concerning the evaporites and the pre-Permian floor of South-East Durham

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Abstract
Summary: A description is given of the stratigraphical information obtained in the mining of anhydrite at Billingham and from exploratory boreholes in the immediate locality. Details are given of an extraordinary crumpling of roof marl and anhydrite into the working seam, attributed to gravity movement on the sloping pre-Permian floor. The existence of a high ridge of Carboniferous rocks forming the pre-Permian floor is postulated as an interpretation of available information in South-East Durham. The delineations of the westerly limits of the salt of the Tees-mouth area are discussed with reference to their probable correlation with the line of the Carboniferous ridge and the local limits of the seams of anhydrite. The existence of a gap in the Carboniferous ridge is inferred as correlating stratigraphical features found in the mine workings, underground boreholes and salt thicknesses.

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