11 



<Creek at its sharp northerly bend, fragments of blue limestone 

 were seen in the dry watercourse, and were traced for about 

 half a mile above the spot where the (h) limestone crossed the 

 valley. These boulders certainly indicate another band of 

 limestone higher up the valley, which may prove to be Lime- 

 stone (c) in its easterly extension. 



Sixth Creek and Finkerton Gaily. — The steep face on the 

 northern side of the Montacute Mine hill is probably a fault- 

 scarp — the fault being east and west and parallel with the 

 strike of the beds — and is cut on its eastern limits by the mine- 

 fault (already described), which has a north-north-west by 

 south-south-east direction. A shaft recently sunk on the flat 

 in front of the hill proved the blue limestone at a depth of 

 60 ft., which, in relation to the same limestone in the scarp 

 of the hill, shows a vertical displacement of over 200 ft. As 

 the material thrown out from the shaft contains limestone 

 broken by quartz and calcite veining, together with some 

 .sulphides, it has evidently been sunk either on or in close 

 jDroximity to these faults. 



Taking the new shaft on the flat (just referred to) as our 

 starting-point, we find the blue limestone series outcrops a 

 little to the west, on the public road (dip east, at 50°). The 

 beds can be followed at the water level of the Sixth Creek, 

 through Mr. T. T. Trebilcock's garden, where the strike of the 

 beds is south-east, with a low angle of dip, the latter being 

 apparently influenced by a lateral thrust at this point. The 

 limestone is seen again at one or two points on the Montacute 

 Road, before reaching the road on the right (which branches 

 off to Castambul), and cuts across the fork separating these 

 two roads. It then becomes a marked feature in the left bank 

 of the Sixth Creek, where it shows a strike parallel with the 

 creek and outcrops nearly level with the water's edge, until 

 shortly before reaching Mr. Walter Smith's sawmill on the 

 creek. Here the beds are thrown to an upcast, which alters 

 the strike, causing the limestone to make a return bend, when, 

 rising to the hill on its left bank, it crosses over into Pinkerton 

 Gully. Before reaching the crest of the hill, however, its 

 •continuity is broken by a dip fault, which throws the beds to 

 the north-west. On passing into Pinkerton Gully, the lime- 

 stone skirts the head of a small tributary to the main valley, 

 forming a strong mural scarp, and, rounding the spur along 

 the face of which the Pinkerton "screw-road" passes, develops 

 an extraordinary scarp face of about 150 ft. (the greatest 

 thickness of these beds that have come under my observation), 

 and then, having reached the bottom of the "screw," passes up 

 the valley towards the head of the gully. 



