577 



which forms the main axis of the mount. The truncated 

 quartzite makes a sheer scarp of about 300 feet (known as 

 the Gibraltar Rock), and a little further to the west the till 

 forms a pyramidal hill of about the same height. The fault 

 follows the bed of the creek from the bifurcation of the road 

 (in Sec. 312) downstream to the sharp bend where the creek 

 turns to the northward along the eastern side of the mount. 

 The mount is on the upthrow side, and the purple-slate series 

 on the right bank of the creek forms the outcrop on the down- 

 throw side. 



Bartagunya station house, situated about a mile from 

 the south end of Mount Remarkable, is on the purple-slate 

 series. Behind the house there is a rough surface of quartzite 

 (dip, W. at 72°) with purple-slates beneath. Below the 

 house the slates dip W. 20° S. at 80°. In the small creek, 

 further down from the house, there is a strong ridge of 

 whitish quartzite (dip, W. 10° S. at 55°). A block or two 

 of reddish limestone occur on the left-hand side of the path 

 going up the hill from the house towards Mount Remarkable 

 Creek. On the saddle of the hill, going over into horse- 

 gully on the way to the creek, the strata are disturbed (dip, 

 E. 12° S.). Going down the hill to the Mount Creek slates 

 show dip slopes nearly parallel with the gully (dip, S.W.). 

 Near the bottom of the path the dip varies from N. 20° W. 

 to N.E. The beds are here within the area of the fault zone, 

 the slates are greatly mashed, and in places show very 

 denned shear-planes, which are made conspicuous by differ- 

 ential composition and bands of colour. Large irregular 

 masses of mash-rock occupy the bed of the main stream just 

 below the Gibraltar Rock, and similar outcrops are seen on 

 either side of Rankine Creek for a considerable distance 

 upstream. Following up the main creek above the Gibraltar 

 Bock, the mash-rock forms hills on the southern side of the 

 creek several hundreds of feet in height. 



At the south-eastern angle of the mount, a little east of 

 the Gibraltar Rock, the main north and south fault inter- 

 sects the main east and west fault. In the angle produced 

 by this* intersection is included a segment of the purple-slates 

 series which, as a faulted block, extends northwards for about 

 a third of a mile, and throughout that length is in juxta- 

 position with the quartzites of the eastern portion of the 

 mount. The relationship of this faulted block to the sur- 

 rounding areas shows an important hiatus in the geological 

 order of succession on two sides — on the northern boundary 

 the main limestone is faulted out, and on the western side, 

 bordering the mount, the main limestone, silicous limestones, 

 Tapley Hill slates, and tillite are missing. 



T 



