and south-east, with the dip at south-west. The stone is very 

 much contorted and broken, apparently from overt hrusts from 

 the north-east, (h) Another prominent outcrop, or ridge, of 

 the marble occurs a short distance to the eastward of the bend, 

 and cross\.s the river with a strike north, 20° west, with dip 

 westerly, (c) The third outcrop occurs in the river, on the 

 western side of the bend, about 60 yards lower down the 

 stream, where it crosses to the left bank of the river and is 

 overlain by quartzite. The base of the marble beds can be 

 seen a little higher up the river from the bend mentioned 

 above, where the stone, while still calcareous, becomes strongly 

 arenaceous. This is near the junction with the bottom grits into 

 which the bed passes. The arenaceous limestone has a dip 

 30° south of east, at 30°. 



A few yards higher up the river the basal grits outcrop 

 with a low angle of dip to the south. We have there an instruc- 

 tive illustration of the effect of the Pre-Cambrian massif on the 

 lie of the basal beds of the Cambrian. In Goodwin Gully, the 

 dip of the beds is west ; at the angle of the Torrens, the dip 

 becomes south-west ; and in the case of the grits, which skirt 

 the so.uthern side of the massif, the dip is south. 



The Lower Torrens-limestone, which in its eastern exten- 

 sion runs almost parallel with the river, is greatly broken by 

 faulting. There are three such fragments in Mr. Hersey's 

 and Mr. F. Batchelor's grounds, within half a mile of "Marble 

 Bar." (See Geological Map.) These fragments are as fol- 

 lows:— (1) The "Marble Bar," in the bed of the River 

 Torrens, which can be traced by slight surface indications in a 

 south-easterly direction to a small excavation for ironstone — 

 the limestone having been metasomatized into limonite at the 

 fault-plane, which cuts the limestone transversely. (2) A 

 fragment on the respective borders of Messrs. Hersey's and 

 Batchelor's properties, and is cut off to the east as it touches 

 the old road going up the ridge. (3) In Mr. Batchelor's 

 orchard, where it also passes over the old ridge-road and runs 

 out in the paddock on the opposite side of the road, with much 

 ironstone at the surface. 



From this point the limestone is cut off on its eastern 

 side by quartzites, which form the high ground between 

 Batchelor's gully and the galvanized-iron hut valley, along 

 which ridge the old easterly road runs. On the eastern limits 

 of the quartzites the bottom limestone is met with again, near 

 the saddle passing over into the galvanized-iron-hut valley. 

 (Sec. 335, Onkaparinga.) The limestone follows the eastern 

 side of the valley to the dividing fence, beyond which a segment 

 is slightly faulted — thrown south by about its own width 



