BRITISH ASSOCIATION MEETING. 



457 



hill, on the scale of ^ 0 f an inch to the foot, drawn from careful measurements * 

 The bottom of the figure is supposed to be the level of low water spring- 

 tides. The dotted line, a, m, o, e, g, indicates the original profile of the coast 

 on the assumption that at this place it resembles the general contour where it 

 still remains untouched by the hand of man. The outline, a, b, c, d, e, g, of 

 the coloured portion of the figure shows the artificial cliff produced by the 

 quarrying operations ; consequently the space between this and the dotted line 

 shows the amount of rock which has been removed. 



An attempt is made in Fig. 2 to show, at one view, a portion of the back 

 and left-hand, that is the west and south, walls of the quarry, on the scale of 

 | of an inch to the foot. Near the top of the west or back wall, and almost 



Fig. 2. 



at the angle formed by the intersection of the south wall with it, is a dike {a, hi 

 in Eig. 2) of breccia made up of bones, reddish clayey earth, and angular pieces 

 of limestone ; the last evidently derived from the immediately adjacent rock, 

 and varying in size from the merest fragments to slabs fully a foot square and 

 six inches thick. The earth is in all respects similar to that in which the bones 

 are imbedded in the caverns of the Torbay district generally. The dike is 

 vertical, has a north and south direction, is 27 feet high, 12 feet long, and 

 2 feet thick at its southern end; it thins out at its northern extremity, so 

 that it is wedge-shaped ; its base is about 96 feet above the level of low- 

 water spring-tides, so that its summit, which reaches the unquarried surface of 

 the cliff, is about 123 feet above the same level. It may be stated here that 

 the base of this mass of breccia is on the same level as the " bone bed " in the 

 famous Windmill Hill Cavern already alluded to. The situation of the dike is 

 seen at a, b, in Fig. 1, which shows a vertical section at right angles to its 

 length so as to show its thickness, i.e., ^ s rea ^ thickness. 



There can be no doubt that this mass of bone-breccia filled a north and south 

 fissure, or, possibly, a portion of such fissure ; whether it formerly extended 

 further northwards cannot now be determined, the limestone having been too 

 far removed there to leave any means for forming an opinion on this point. 



* The measurements refer to the diagrams exhibited at the meeting, which were 

 in size, 2 feet, by 1 foot, 7 in. The woodcuts are, of course, much reduced, and 

 their scale is about ^ of the linear measurement of the diagrams. 



VOL. IV. 3 D 



