78 



is bleached along lines of joints, but preserves a dark colour in 

 the centre of the prismatic fragments. The grey shale is studded 

 with numerous pellets of small dark-coloured calcareo-siliceous 

 inclusions, which are most numerous in an important cliff section 

 of the same beds seen on the coast at a distance of three miles to- 

 the south-west. Strike, N.N.E. and S.S.W. Dip, E.S.E. at 68°. 

 These argillaceous shales occupy the lowest horizon of the- 

 Cambrian rocks exposed in the section. They are seen, both at 

 the base of Sellick's Hill and on the coast, to pass under a thick 

 talus of Pliocene sands, clays, and gravels, which in the sea 

 cliffs have a thickness of from 100 to 200 feet. On the coast 

 these Pliocene beds rest upon gently-rolling Eocene limestones 

 that, in places, are seen to be banked up against the face of the 

 Cambrian shales. 



The Fossiliferotts Limestones. 



The fossiliferous belt crosses the main road a few hundred 

 yards above the Sellick's Hill Hotel, having a North-East and 

 South- West direction. The outcrop follows the foothills, and 

 can be traced for miles on either side of the road. 



In a South-West direction fine exposures of the coralline belt 

 are seen by the side of the road and in the adjoining paddock, 

 occurring in large tabular surfaces, which are partially obscured 

 by shallow soil or patches of travertine. At this point the stone 

 is crowded with Archceocyathince through a vertical thickness of 

 100 feet. The outcrop can be followed with the greatest ease,, 

 the line of strike passing behind the, so-called, " Mount Terrible 

 Farmstead,"* about two miles from Sellick's Hill. Here the soil 

 is deep and cultivated, but large boulders of the fossiliferous 

 marble have been removed, as obstructions to cultivation, to the 

 fence line. The strike, as taken from the superior beds of flaggy 

 limestones on the higher ground behind the farmhouse, was 

 found to be N.E. and S.W. with a nearly vertical dip. The out- 

 crop was followed in the same direction over saddleback hills and 

 deep ravines for about four and a-half miles from the main road. 

 At this extreme distance reached the stone was to all appearance 

 equally as fossiliferous and as important in vertical development 

 as at Sellick's Hill. The strike of the beds at this point is 

 nearly parallel with the coast line, and heading towards Myponga 

 Jetty and Normanville, which could be seen in the distance. 



Retracing my steps to the main road, the fossiliferous lime- 

 stones were followed in their North-Eastern Extension from 

 Sellick's Hill. They are seen in the bed of the creek a little 

 above the bridge where the stream crosses the road. Rising from 



* The Mount Terrible of the official map is situated about four miles to- 

 the East of this point. 



