557 



on a cross ridge, a little north of the last-named spot, is a 

 dark-coloured slate; dip, due N. at 20°. 



On the third ridge, separated from the base of the 

 mountain by a small creek, are further brecciated rocks — 

 some of which are siliceous — and on its western slope is a 

 considerable fragment of a sheared limestone; dip, E. 20° S. 

 This ridge communicates in one place with the side of the 

 mount in the form of a spur, and consists of micaceous slate; 

 dip, S. 15° W. at 72°. 



In a position still further to the southward, and not far 

 from the Cathedral-rock Creek, further outcrops of the 

 siliceous limestones occur, the various outcrops showing dis- 

 cordant readings of dip and strike in relation to each other. 

 On the spur, situated behind the Saddle Hill, there is a 

 prominent ridge of broken limestone (spotted with micaceous 

 hematite) and mylonitic grits, with a dip to the N.E. A 

 little further to the southward is a still more prominent 

 dyke-like outcrop of limestone, which ends abruptly on the 

 north side of the Cathedral-rock Creek in a high pinnacle. 

 The limestone, which is slightly mineralized and is penetrated 

 by an old drive, has a dip E. 20° N. at 75°. A parallel 

 outcrop of limestone, on the eastern side of the last described, 

 runs out against the purple-slates of the Saddle Hill in an 

 unconformity caused by faulting. 



The beds on the southern side of the Cathedral-rock 

 Creek are somewhat less broken in their outcrops than those 

 on the northern side of that creek, and almost the whole- 

 ground between ihe Mount Creek and the base of the mount 

 is occupied by the limestones together with several basic 

 igneous dykes. The top (or main) limestone is situated nearest 

 to the Mount Creek, as already described, while the siliceous 

 limestones on its western side are exposed in numerous more 

 or less parallel outcrops that continue almost up to the main, 

 quartzite of the mount. 



The greatest thickness of the siliceous limestones in this 

 cross section is on the western side of the calcareous zone 

 nearest to the mount, where the outcrops are about 100 yards 

 in width and show lineal and concentric weathering similar 

 to the features present in the corresponding beds at the 

 northern end of Mount Remarkable. 



The siliceous limestones follow the general trend of the 

 main limestone, on its western side, over the ridge into the 

 next tributary creek, which finds its affluence with the main 

 creek a little above the place where the main limestone 

 crosses the latter. They then ascend to the rise on the 

 eastern side of the Mount Creek, where they make a great 



