On the Chemical and Microscopical Characters of the Whin Sill

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Abstract
The term Whin Sill is applied in the north of England to the intrusive sheet of basic igneous rock which forms such a marked feature in certain portions of the Lower Carboniferous district of Durham, Cumberland, and Northumberland. It is unnecessary, on the present occasion, to describe the stratigraphical relations of the rock, because full details are to be found in the papers cited above, and especially in those by Prof. Sedgwick and Messrs. Topley and Lebour. For some time there was a discussion as to whether the rock was intrusive or interbedded, but this discussion may be regarded as having been closed by the publication of the able paper by Messrs. Topley and Lebour. It is now admitted on all hands to be intrusive. To give some idea of its extent, I may mention that it is exposed as an inlier in Teesdale for a distance of many miles. It reappears in the Cross-Fell escarpment in Cumberland, and may be traced thence, with slight interruptions, across the county of Northumberland, to the sea-coast at Dunstanburgh, following in a general way the strike of the beds with which it is associated. As the strike bends round to the N.W. in the northern portion of Northumberland, the Whin Sill reappears on the coast at Bamburgh, and may be traced from this point to Kyloe, where it is last seen. The distance from the point in the Cross-Fell escarpment, where it first appears, to Dunstanburgh is about 60 or 70 miles. Speaking

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