86 



-characteristic of the series with a S.W. and N.E. strike. Dip, 

 S.E., at 45° to 50°. A marked feature of the beds at this point 

 is the thickening of the wedge of flaggy quartzites, which first 

 appear towards the base of the calcareous series near Sellick's 

 Hill, and, thickening as they extend eastward, split the lime- 

 stones into an upper and lower series. 



The lower limestones are well exposed in the next creek, 

 situated a little south-west of Mr. McBurney's homestead, as 

 mentioned in the paper (p. ), but the calcareous belt is not seen 

 again until Willunga is reached. At the latter place the lime- 

 stones are once more bared on the hills behind the town, where 

 the stone is a close-grained white marble, with small crystals of 

 pyrite. From this point the outcrop is clearly defined for several 

 miles, following the foothills, and has been quarried by Mr. F. G. 

 Culley, through whose land the limestone passes. Dip, 60° S.E. 

 It is difficult to tell the exact thickness of the beds, as they are 

 more or less obscured by turf, but the width of visible outcrop 

 varies from 150 to 250 yards. 



At Springbrook, two and a-quarter miles from Willunga, the 

 stone has been extensively quarried for road metal. Here the 

 limestone is a dark " blue metal," intercalated with thin earthy 

 shales, and has a dip of 50°. This was the furthest point visited, 

 but the outcrop was visible for a distance of three-quarters of a 

 mile still further to the North-East. 



No fossils were seen in this journey, but the limestones in 

 some places included numerous circles filled with radiated 

 crystals of calcite that may possibly represent the cups of 

 Archfeocyathirue, although no structure could be detected. I was 

 told, however, by Mr. Brown, the owner of the Springbrook 

 Quarry, that shells had been occasionally seen in the quarry 

 when breaking the stone. 



These extended observations have determined the outcrop of 

 the Cambrian beds for a further six miles beyond that mentioned 

 in the paper, or about 25 miles in all, and when last seen the 

 beds were in a line of strike that was directed into the heart of 

 the Mount Lofty Ranges. 



My thanks are due to Mr. F. G. Culley, of Willunga, who 

 kindly acted as guide, and facilitated my observations in the 

 Willunga neighbourhood. 



September 2, 1897. 



