Page:Quarterly Journal of the Geological Society of London, vol. 33.djvu/43

Rh Section 10 is one of Mr. Binney's, given by Mr. Hull. I insert it because of its resemblance on a restricted scale to that of Ardwick on the one side and that of Ifton on the other. It is separated from the last by a distance of about forty miles; and the country between consists of a trough filled up with Triassic beds which hold the great salt-deposits of Cheshire.

Section 11 is that of Ifton, which I have already described, and to which I shall have occasion to refer again.

Section 12 is one which, in its middle portion, group 3, is well known and often quoted. It was, I think, first described by Prof. Sedgwick, in the year 1832, though alluded to by Messrs Conybeare and Phillips in 1822; and it has subsequently been noticed by Sir R. I. Murchison, Prof. Ramsay, Mr. E. W. Binney, Mr. Hull, and others. Prof. Sedgwick described it, in descending order, as follows:—

Sir R. I. Murchison places the conglomerate group 3, on the same horizon as the Ardwick limestone bands and the Magnesian Limestone beds of the north-east counties. Mr. Hull, however, is inclined to place it, along with the conglomerates of Shiffnal, South Staffordshire, and Enville, in the lower part of the Permian series. In deciding a point of this kind, the position the strata occupy is of more importance than their mechanical structure and the derivation of the materials of which they are composed. Seeing, then, that