551 



The most extensive development of these beds in the 

 neighbourhood occurs on the western side of Mount Remark- 

 able, where they, rest, for their greater length, on the glacial 

 beds. They begin, in their most southerly outcrop, within 

 the fork of the two roads, already referred to, and almost at 

 the same place where the tillite begins in the Mount Creek 

 above the Gibraltar Rock, and are bounded by the purple- 

 slates-crush-rock on the one side and the tillite on the other. 

 Northward of Sec. 311 they form the slopes on both sides of 

 the main creek, and maintain a very uniform strike and dip 

 over long distances (dip, W. 10° S. to S.W., at 50°-55°). 



After crossing the watershed, between the Mount Creek 

 and Spring Creek, they are bounded on the eastern side by 

 Spring Creek and on the western side by the thick (Brighton) 

 limestones, and continue northward beyond the limits of the 

 mount. A good section of the beds can be seen up the 

 "Waterfall" Creek, on the road that rises over the western 

 ridges, about a mile up the valley from the Spring Creek 

 mine. The beds here are very fissile on the bedding, and as 

 jointing is also well developed the rock splits up into cuboidal 

 masses. Above the waterfall the beds become more calcareous 

 and massive, and finally pass into strong limestones. 



Smaller areas of these beds are brought to the surface 

 by faulting at the northern termination of the mount, and 

 also on its south-eastern side. Further references to these 

 beds will be found below in the paragraphs dealing with the 

 tectonic features of the district. 



5. The Limestones (Brighton Series). 

 The limestones follow in the series in the same order as 

 in the type district, and with very similar lithological 

 features. They show a gradual passage from the Tapley 

 Hill shales, more or less calcareous in the lower members, to 

 impure siliceous limestones, with "vermiculate" structure, 

 in the middle members ; passing up into relatively pure lime- 

 stones (sometimes oolitic) in the highest beds. 



(a) the limestones in the western outcrops. 

 The beds make a very regular outcrop on the western 

 side of Mount Remarkable, not immediately connected with 

 the mount itself, but they form a lateral ridge (or saddle) 

 that is separated from the mount by the valleys of Spring 

 Creek and the headwaters of Mount Remarkable Creek. 

 They have been subjected, in places, to minor faulting and 

 displacement, and vary as to the extent of spread in the 

 outcrop, but in the case of the main limestone attain an 

 average width of about two chains. The less pure and 



