Extract

It is now many years since, in my rambles amongst the trap rocks of the Campsie Fells, I became acquainted with the peculiar masses of rock which form the subject of the present communication. In my paper “On the Geology of the Campsie District,” I purposely omitted all reference to them, hoping to be able at some time to discover whether or not the rock belonged to the hill, and if so, to find its outcrop. Other duties, however, for a long time prevented me from continuing the investigation, though the subject frequently occurred to my memory; and since the discovery of beds of coal and other strata, with plants and fish-remains of Carboniferous age, intercalated with the traps of the Kilpatrick Hills, recorded in the Transactions of the Society,^* the importance of finding evidence of interbedded strata at other points in the trap of the Lennox range of hills became the more apparent.

The tract of hill-side on which I first discovered the rock in question, lies to the north-west of the village of Lennoxtown, below a lofty precipice of trap known as the “Black Craig.” Underneath this precipice a long slope of the hill is covered with debris and large masses of rock that have fallen from the cliffs above. These strew the hill-side as far down as the road leading from Campsie to Fintry. If the hill be ascended from this point, a little to the east of the present march-dyke, until we come to the old

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