Page:Quarterly Journal of the Geological Society of London, vol. 31.djvu/836

680 On the northern side of the ravine the fissures are more numerous and extensive. Some shallow openings at the western end have been in use quite lately, as cellars or pig-sties for some cottages recently pulled down; but a little to the east of these there is a fine fissure (A, fig. 2) with a large cavern-like entrance; this fissure, locally



called the "Pin-hole," I have begun thoroughly to explore. It penetrates some 40 or 50 yards into the hill-side, running nearly magnetic north, and is fairly horizontal. It is moderately lofty throughout a good part of its course; but a short distance from its entrance it bifurcates and becomes very narrow, the western fork being inaccessible beyond