240 



ried. In these sections there are extraordinary evidences of 

 crush, with reversed faults showing push from the east. 



The 'blue metal" beds are nipped in between two ridges 

 of the thick quartzite, which appears to be repeated here by 

 a strike fault. One ridge runs from the River Torrens by way 

 of Anstey's Hill to the bottom end of the Teatree Gully 

 gorge: and the other, almost parallel, crosses Anstey's Hill 

 road, about half a mile higher up, and strikes for the top of 

 the Teatree Gully, where it has been extensively quarried. 

 Between these two ridges of quartzites, the phyllites and 

 "blue metal" beds have received a great nip (as already 

 described), with much quarfz veining that has prompted ex- 

 ploration for minerals, but without success. In all 

 the other instances the "blue metal" beds out- 

 crop on the western side of the thick quartzites, 

 but in the Anstey's Hill and Teatree Gully sec- 

 tions they outcrop on the eastern side. This accords with the 

 prevailing dip of the quartzites of Anstey's Hill, which is 

 towards the east, and has been no doubt influenced by the 

 strike fault which has given the beds an easterly tilt, and 

 thereb}^ also thrown the "blue metal" beds to that side. 



Waterfall Gully. — That part of the gully which is below 

 the First Waterfall, as well as the left bank of the stream, in 

 its upper part as far as the Eagle-on-the-Hill, consists al- 

 most entirely of thick slates, which are presumably an exten- 

 sion of the thick (Glen Osmond) slates. A footpath leads up 

 from the base of the waterfall to the ledge over which it 

 plunges. On this path, just before reaching a rustic bridge 

 which spans a small runner from the hill, an outcrop of the 

 dark calcareous beds can be seen in the bank side. The beds 

 have a dip, 20° south of east, at 46°. 



General. — The repeated occurrence of this very charac- 

 teristic horizon of carbo-argillaceous limestone and chert is of 

 great significance with respect to the stratigraphical rela- 

 tionships of this much-disturbed district. Assuming that 

 these occurrences represent one and the same set of beds, they 

 indicate an horizon in the thick (Glen Osmond) slate, which 

 becomes an important datum line for the determination of the 

 associated quartzites, both above and below. Their anoma- 

 lous position, in flanking the base of the Stonyfell quart- 

 zites (although really superior to them in position^), is ex- 

 plained by the great fold along the western side of the range 

 in which the thick quartzites participated. In this move- 

 ment, the overlying slates were tipped over to the west, and, 

 being softer than the quartzites, have suffered a more rapid 

 denudation, which has placed them at a lower level than the 



