229 



1872. G. H. I. Ulrich. Report on the Welcome Mine 

 [north of Umberatana] — "The underlay wall of this reef is 

 well defined, and composed of a gritty silicified sandstone of 

 a few feet in thickness, beyond which follows conformably a 

 boulder-conglomerate, in very thick beds, the enclosed boul- 

 ders of which consist mostly of quartzite." Pari. Paper 

 No. 65 of 1872, p. 12. 



1879, R. Tate. "Evidences of a missing chapter in the 

 geological history of this province are afforded by the occur- 

 rence of rolled pebbles of stratified rocks in the oldest known 

 of our sedimentary deposits. These are well-rounded quartz- 

 ite pebbles, discovered by Mr. Scoular, in the grit bands in 

 the basal beds of the Gawler Hills, and subans^ular pebbles of 

 gneiss in the siliceous clay slates at Hallett's Cove." Pres. 

 Add. Ad. Phiios. Soc. (Roy. Soc), vol. ii., p. xlvi. [The rocks 

 at Hallett's Cove, referred to in the above paragraph by the 

 late Professor Tate, are not in situ, but are blocks of the old 

 Cambrian till, which were torn from their bed by land ice 

 of a later age, and in this way became erratics in the newer 

 till laid down at Hallett's Cove.] 



1884. H. Y. L. Brown. Report on country east and 

 west of Farina. "Other portions of the ranges | Mount Nor'- 

 vVest] consist of argillaceous grit and conglomerate, quartzose 

 grit, quartzite, kaolinized slates, arid sandy shales. The con- 

 glomerate, besides pebbles of quartz, flint, lydianstone, and 

 siliceous pebbles of all kinds, contains large boulders of quartz 

 rock and quartzite two or three feet in diameter." Also, 

 "Termination Hill . . . consists of quartzite and cal- 

 careous boulder conglomerate (comprising quartzite, quartz 

 rock, clierty flint, granite, porphyry, and limestone), many of 

 the boulders being of considerable size, interstratified with 

 clay slates," etc. Pari. Paper No. 102 of 1884, p. 1. 



"The conglomerate beds at Mount Nor'-West contain 

 pebbles, boulders, and pieces of granite, quartz," etc. Ann. 

 Report of Government Geologist, 1884, p. 9. 



"The clay slates on the Sturt Creek contain boulders of 

 pebbles of granitic rocks, quartzite, etc., imbedded, and occa- 

 sional bands of grit, conglomerate, and limestone. The thick- 

 ness of the quartzose bands is very irregular, and they thin 

 out considerably in short distances ; they vary from a hard 

 quartz rock to a loose grit, and generally contain a consider- 

 able amount of felspar, and bear a strong resemblance to a 

 decomposed granulite : in many cases it may be that the sili- 

 ceous water, which, in the case of the clay and micaceous 

 slates, deposited quartz in cracks and fissures in that of the 

 sandstone, chiefly penetrated throuo-h the porous material. 



