250 



of tlie dark Hues of ilmenite deposits. The stone can be got 

 in very large blocks, but is of uncertain coherence. 



These beds can be studied at Torode's Quarry, Stirling 

 West, from which the stone for building the Conservatorium 

 of Music and portions of the Adelaide Children's ITospital was 

 obtained. The quarry exposes about 50 feet of stone face, 

 with a south-east dip at 42 \ The top layer of the quarry 

 is a hard siliceous quartzite of the Mitcham type. This hard 

 bed can be traced on the west side of the quarry, across the 

 road, and on the railway line, where it is exposed in the first 

 cutting above the Aldgate Station. The beds also skirt the 

 hillside on the north side of the line, and have supplied a 

 quarry near the entrance to Sewell's Nursery, showing a dip 

 south-east at 21°. Opposite the railway gates (north side) 

 the road is cut through these rocks, showing, in top beds, 

 about 24 feet of soft laminated sandrock, underlain by hard 

 Mitcham stone, with diffused ilmenite grains. Dip south-east 

 at 20°. The hard rock is exposed for about 17 feet in thick- 

 ness, under which is soft laminated felspathic beds. At a 

 short distance up the road to Stirling the first of two quar- 

 ries shows soft laminated rock on top, with hard Mitcham 

 stone beneath, and a dip south-east at 16-25°. About 70 

 yards higher up the road the second quarry exposes hard 

 white felspathic quartzite, in broad dip slopes, reading south- 

 west at 10°. According to the dip, which shows a slight anti- 

 clinal curve across the strike, the main stone probably under- 

 lies the hard rock of the lower quarry, which is further in- 

 dicated by the former being overlaid by hard siliceous 

 quartzite, as in the case of the lower quarry. 



Within 20 or 30 yards of the felspathic quartzite, grani- 

 tic rocks appear in the road, and in the creek which runs by 

 its side. The granitic belt has a width, at this spot, of 420 

 yards, with an outcrop trending in a north-easterly directioa, 

 showing at intervals through the ranges. It cannot be traced 

 in the opposite direction, being apparently obscured by the 

 felspathic sandstones and grits which rest upon it. 



The question of the relationship which the orits bore to 

 the granite was rendered dif^cult, inasmuch as the line of 

 junction is obscured by soil and wash from the liills. It was 

 observed, however, that the granite, which is mostly in the 

 form of pegmatite and aplitic dikes, penetrates a set of beds 

 which are of very distinct lithological character from the 

 local grits, as well as divergent in dip. On the south side of 

 tlie granitic belt aplitic veins penetrate what iriay be a much 

 altered quartzite ; whilst on the north side the granite is 

 bounded by talcosc and chloritic slates, which show a dip of 

 75°, with a face to tl>e road of 77 yards long. At the north- 



