The Geological Results of Measurements of Gravity in the Welsh Borders

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Abstract
Summary: The gravity measurements made by members of the Department of Geodesy and Geophysics of Cambridge University in the Welsh Borders from 1947 bo 1950 are described and the geological results discussed. The methods of measurement and the calculation of the gravity anomalies are not given in detail since they have already been discussed elsewhere. The data given in the paper in the form of a map of the Bouger anomalies are probably consistent to within ±0–25 mgl. At the Malvern Hills the Bouguer anomalies change rapidly from about —25 mgl. on the east to about -(-5 mgl. on the west. A probable interpretation is that there is a deep basin east of the Malverns, filled mostly with Triassic rocks, reaching a depth of nearly 10,000 feet near Worcester and bounded on the west by a surface sloping down at about 45° from the Malvern Hills. It is suggested that the basin was formed by faults, the movement along which began in late Carboniferous times and ended in late Triassic times. Large variations of anomaly in the Welsh Borders appear to have no relation to the known geology and are probably due to heavy Pre-Cambrian masses, particularly in the Black Mountains and near Leominster. The Church Stretton disturbance appears to be marked only by a slight maximum anomaly.

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