555 



intruded by a number of basic igneous dykes, which have still 

 further complicated the geological outcrops. The zone of 

 greatest disturbance follows the foot hills that are situated 

 nearest to the mount; the outer, or eastern, portions of the 

 area are less broken and disturbed than the inner. 



The small creek that comes in from the west and joins 

 the main creek at the south-western angle of Melrose marks 

 a line of cross-faulting that is of stratigraphical importance. 

 The creek referred to takes its rise near the summit of the 

 mount, and in its course flows at the base of a particularly 

 hold scarp of quartzite (the Cathedral Rock), and affords a 

 useful geographical datum line for the purposes of description. 



The Main or Top Limestone. 



The Main Limestone in the south-eastern outcrops 

 exhibits a very regular strike in an approximately north and 

 south direction. Its northern extremity is on the southern 

 bank of the Cathedral-rock Creek, not far from the latter's 

 junction with the main creek. Here it thins out in a curve 

 to the westward before reaching the creek mentioned, and is 

 presumably cut off by the dip fault that runs in a line with 

 the creek. In its southerly trend it follows, for about thirty 

 chains, the western banks of the Mount Creek, forming a 

 steep face about 200 feet above the creek level. It rises to 

 form the crest of the hill in a steep scarp, facing the main 

 creek just above the first bend that occurs in the stream 

 above the Cathedral-rock Creek. The stone is a good pink- 

 and-white limestone, having a dip E. 20° N. at 75°. 



The main limestone comes down to the level of the Mount 

 Creek (at a right angle), but is then cut off by the thin- 

 bedded quartzites of the purple-slates series, which are 

 faulted and have a slight shift to the west. The limestone 

 reappears on the left bank of Campbell Creek, at a 

 short distance from where it is faulted in the Mount 

 Creek. The trend is now S. 10° W., and follows the left 

 bank of Campbell Creek, the limestone forming a broad band 

 on the ridge, and is strongly indented by the transverse 

 streams that find their way into Campbell Creek. The out- 

 crops widen as they near the southern extremity of the beds 

 and attain a spread of over 100 yards. On the right bank of 

 the principal tributary of Campbell Creek is a vertical cave 

 in the limestone, known as the ' 'Blowhole," but it has been 

 but slightly explored. The limestone ends somewhat abruptly 

 in descending the slope of a cross valley, a little to the north- 

 ward of the bridle track that goes round the southern end 

 of the mount, and is replaced by beds belonging to the 

 purple-slates series. 



