On a Mass of Anhydrite in the Magnesian Limestone at Hartlepool, and on the Permian of South-Eastern Durham

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Abstract
T he exposures of Magnesian Limestone in the area under discussion in the present communication are indicated on the 1-inch Geological Survey [Drift] Map, Sheet 103 N.E. (New Series, Sheet 27), with the exception of the fine continuous sections of Castle-Eden, Hardwick, and Hesleden Denes: these are only indicated in part, and seem to have been overlooked by the surveyors. No attempt is made to distinguish the divisions of the Magnesian Limestone. Otherwise I know of no paper dealing with the district as a whole, though scattered references to the exposures of the coast-section and Castle-Eden Dene occur in various publications. The isolated outcrops of Upper Magnesian Limestone with their associated anhydrite-mass, on which the two towns of Hartlepool and West Hartlepool are built, are bounded on the west and north-west by a valley filled with Glacial and superficial débris, probably connected with the watershed of the pre-Glacial Tees Valley. The nearest outcrops of Magnesian Limestone occur nearly 2 miles away to the west, and nearly 3 miles away to the north-west along the coast. The area is bounded on the south-east by the fault, everywhere hidden and therefore largely problematical, which brings the Red Beds down against the Magnesian Limestone, and is marked on the Survey maps as extending in a straight line from West Hartlepool to a point south of Darlington. The levels of the limestone in borings north and south of this fault at West Hartlepool show a difference of about 700 feet, and so the southward throw

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