93 



Dam, I should think tliat the outcrop of me.tamoi'plno rocks re- 

 ferred to above represents a continuation of this Paheozoic 

 margin which there may have readied it furthest west, and turns 

 thence down to Point Culver. 



Concerning these protuberances, wliicli are, according to the 

 gentleman above quoted, granitic, such is not the case in the out- 

 crop in question, though there is little doubt that this formation 

 of the country referred to points strongly to a granitic sub- 

 stratum, which may even outcrojD at no great distance from 

 where we crossed that formation. 



Taking it for granted that a line of such formation exists, ex- 

 tending from long. 125°, by Boundary Dam to Ooldea, it would 

 form there, as has been hinted in a former chapter, another 

 undulation of Azoic rocks running almost parallel to the one 

 referred to in Section II., and furthermore this margin of the 

 older beds would form a dividing line between two extensive sub- 

 terranean basins, the one to the north forming a receptacle for 

 the Mesozoic strata, sedimented in it with a fringe of Paheozoic 

 rocks along the northern end, and the southern basin with the 

 cainozoic sediments of the Bunda tableland. 



Another, and far more extensive, Paheozoic counti-y is repre- 

 presented by the Fraser Range. 



Geographically speaking, this range is very limited, as the 

 portion rising to a perceptible height is not more than 1-5 miles 

 in length, and about six or eight miles in width, but geologically 

 it extends over a wide area, slight undulations being only per- 

 ceptible, but geognostically closely related to the Fraser Range. 



This country was entered soon after leaving Camp 62, and the 

 rocks comprising this formation were talcose and micaceous 

 schists, feldspatic rocks, and chiefly siliceous slates and quartzites. 



The main mass of the Fraser Range consists of hornblendic 

 schists indistinctly stratified, and apparently representing an older 

 underlying stratum of more distinct stratified siliceous rocks of 

 the outlying portions (see fig. 12, pi. 5). 



In one part of the range, namely, on the way to Simon's Hill 

 from the Station Hut, an interesting occurrence of granitic 

 dykes was observable. They are moderately high, with wall-like 

 perpendicular sides running parallel to each other for a very long 

 distance. As this granite is inclined to split in rectangular 

 blocks, these dykes have the appearance of ruined walls of 

 houses in a street in an ancient town. (See fig. 13, pi. 5). 



Generally speaking, as regards eruptive rocks piercing the 

 schistose formation of this eastern part of Western Australia, 

 there were none met with of any extent or importance. The 

 Fraser Range proper, which I inspected closely, exhibits only 

 moderate signs of eruptive disturbances. 



