§ 1. Introduction. Having in the preceding communication pointed out some peculiarities in the position of the great central carboniferous chain (which extends from the neighbourhood of Derby to the Scotch Border), with the view of connecting it with the calcareous zone of the Cumbrian mountains ; I now proceed to describe in detail the composition of a very remarkable portion of it, forming a mineralogical link between the High Peak of Derbyshire and the region of Cross Fell. The facts adduced will serve to explain some of the changes the chain undergoes in its range between one extremity and the other; and will also supersede the necessity of many details respecting the carboniferous zone of the Cumbrian mountains, which once formed, beyond doubt, a continuous part of the same system, and is now only separated from it by the great breaks and dislocations described in the preceding paper.

The principal section * about to be described, commences at Penigent in Horton parish, and, passing through the highest mountains of the range, ends in the plain of Kirkby Stephen. Two other sections† connect this line with the ridge of mountains on the west side of Swaledale. Nearly at right angles to the same line are drawn a series of transverse sections ‡, prolonged across the breaks connected with the great Craven fault. They will, I hope, place in a striking point of view some of the internal movements which took place when the chain was elevated, just before the period