Page:Quarterly Journal of the Geological Society of London, vol. 33.djvu/620

526 already been worked as far as practicable, and few extended a greater distance before a fault was met with; and as the seams corresponded on both sides of the valley the same difficulties also occurred in respect to the frequency of faults in both. One of them, on the west side, that had been so worked out, Mr. Barkley informed me, was found to be bent both downwards and upwards, as well as being partly horizontal in the central portion, somewhat in this form:—

On the west side of the valley the coal-seams were not so plainly seen cropping out at the surface, nor so numerous as in the eastern ridge, where there were no less than eleven or twelve seams thus existing, of varying thickness and quality.

The extent in which this number of beds or seams occur on the east side of the valley is about two miles; the seams being interstratified with shales, sandstones, and conglomerates of quartz-pebbles, with thin bands of clay occasionally, and also with thin bands of ironstone, the whole comprising a considerable thickness of these Coal-measures. See following sketch section:—

The following are the details of one of the seams now being worked in the upper part of the valley:—