On some Quartzite-Dykes in Mountain-Limestone near Snelston, Derbyshire

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Abstract
I. DESCRIPTION OF THE QUARRY AND THE DYKES. About 3½ miles south-west by south of Ashbourne, near Snelston Common, is an inlier of Mountain-Limestone surrounded by Keuper Marl. According to the Geolo~cal-Survey Map, the outcrop of limestone is roughly elliptical in shape, the major axis extending for a distance of about half a mile in a north-north-easterly direction, and the minor axis in a west-north-westerly direction for about one eighth of a mile. Coekshead Lane, the road from Norbury to Cubley Common, passes over the inlier, which only forms a slight feature in the landscape, at a height of about 600 feet above Ordnance-datum. On a clear day, some of the churches and chimneys of Derby, distant about 11 miles, can be seen from the top of the quarry. The limestone has been quarried on both the north and south sides of Cockshead Lane for about 40 feet below the ground-level, so that the lane passes over a high wall of limestone-beds, which have been left intact between the two quarry-floors. The northern quarry is now disused. It contains lead-and copper-ores, which were worked about 30 years ago. It is outside the area of the main mass of Mountain-Limestone to which the curious lead-mining laws apply, and I was informed that the present owner does not allow the lead-ore to be worked. The quarry south of Cockshead Lane is being worked for roadmetal.The inlier is in the form of a dome or pericline,with its greatest extension

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