240 PROCEEDU!^GS OF SECTION C. 



with the phosphate deposit. With regard to the size of these caves and 

 depressions, the evidence obtainable iVom the position of the outcrops 

 of limestone points to them being large. 



Samples analysed contained up to 75 '44:% tricalcic phosphate. 



The phosphate rock is found, intermittently, over seven sections 

 of land in the Hundred of Clinton, and a large quantity has been 

 marketed. 



Fairview, H^mdred of Bright. — About eighteen miles south- 

 south-east of the Township of Kooringa (Burra Burra). 



The phosphate in the north workings is in irregular-shaped bodies 

 and bands, associated with claystone and clay, with which it is inter- 

 stratilied, and segregated. It contains small vems of quartz, such as 

 are found in lode formations in some places, and varies from a 

 compact chalk-like rock to a soft friable one. On the east side 

 doloniitic limestone, of presumably Cambrian age, bounds the deposit; 

 and west, at a distance of several chains, in which direction the 

 ground nses steeply, the bed rock exposed is quartzite. These rocks 

 strike north-north-west, and dip west: the surface space between the 

 outcrops is covered with soil and detritus. At the south workings a 

 quarry has been opened up along and into the side of the hill for a 

 length of 130 ft. and a width varying from 30 ft. to 70 ft. The 

 workings are in massive phosphate rock, which is quarried out in 

 large blocks from a face 66 ft. long and from 6 ft. to 12 ft. high: it 

 shows underfoot, and the depth to which it extends has not yet been 

 ascertained. Immediately east the deposit is bounded by the dolo- 

 mitic limestone, and west, at a distance of several chains, quartzite 

 outcrops on and along the hill ; these are a continuation south of the 

 rock exposures mentioned in connection with the north workings. 



Outcrops of phosphate rock occur at several points west of and 

 between the north and south workings, a distance of 1\\ chains, and it 

 is probable that the deposit is continuous for this distance. Phosphate 

 has also been found north and south of the main workings. 



In this case, as at Clinton, the deposit appears to fill large 

 cavernous openings or caves in the doloniitic limestone. These open- 

 ings may have been ravines at the outlet of an ancient creek or river, 

 in which silt might be deposited and form an estuaiy. The deposit at 

 Clinton is close to the sea coast : that at Bright, although now at a 

 distance from the sea, was, in the late Tertiary times, in close 

 proximity to it. 



Samples of the rock gave on analysis fi"om 51'02 to 76'23%. 

 tricalcic phosphate. 



Three other finds have been made in this locality. 



St. Jnhji's. — Situated four miles south-east of Kapunda. 



The principal outcrop of phosphate rock is approximately 10 

 chains long by 2-i chains wide, and it is in the viciniiy of this exposure 

 that the shafts and quarry workmgs made in prospecting for and 

 opening up the deposit are situated. The outcrop can be traced south- 

 east for some 30 chains, and, where not actually outcropping, 

 scattered lumps of phosphate rock strewn over the surface and em- 

 bedded in the soil indicate its presence beneath. 



The outcrops to the south-east, which are in the vicinity of a 

 quartzite and slate hill, contain quartz and ferruginous matter, and 



