382 PROCEEDI^^GS OF SECTION C. 



the jointing of a bed of sandstone which runs through the mass, 

 this bed being conformable with the contiguous beds. 



An outcrop of white silicious sandstone is noted, and the opinion 

 expressed that "the glacial deposit, i.e., the supposed Tertiary- 

 glacial deposit, is banked up against this, really overlying it." 

 This outcrop is a part of the harder beds, while that which is the 

 supposed " glacial deposit backed up against it " is simply surface 

 denuded rock — "talus" — as before described. They also remai'k 

 as to the imstratified nature of the small cutting in the Lateral- 

 road, not far from this, which is due to similar, though not iden- 

 tical, causes. Mention is also made of the fact that a considerable 

 amount of this material about half a mile uj) the Myrniong Creek 

 frona the confluence of the Myrniong Creek and Werribee River, 

 about lOOft. in thickness, similar to that described on the Ballarat- 

 road, is exposed, and this, it is said. " consists of a mass of 

 yellowish-white clay, quite unstratified, soft on the weathered 

 surface, but harder on being penetrated." Again, it is stated 

 that " on the other side, to the north of the Myrniong Creek, but 

 nearer its junction with the "Werribee River, this glacial deposit 

 attains a depth of about 1.50ft., and can be traced over the brow 

 of the valley to the level of Mr. Brittlebank's house, 350ft. above 

 the creek and about 1,100ft. above the sea. It then spreads out over 

 the surface" — from Avhich they "think it evident that the valley 

 now occupied by the Myrniong Creek, at this point at any rate, is a 

 v^ery ancient one, and was at one time probably almost filled up by 

 this Tertiary glacial conglomerate." The observations made by these 

 gentlemen in reference to the position, depth, and composition of 

 the first two of these deposits are approximately correct ; but the 

 nfei'ence as to their having been deposited by Tertiary glaciers 

 appears to us not to be borne out by the evidence, inasmuch as this 

 valley would seem to have been completely eroded since the newer 

 basaltic overflow ; the unstratified material referred to — that at the 

 100ft. and 150ft. sections — being made up in part by slips and 

 denudations from the stratified rocks, other portions having ap- 

 parently been deposited by the creek as it eroded its course 

 from side to side on the flanks of the valley and continued to 

 deejjen its bed, the river wash referred to in turn also wearing 

 away and rolling down the sides of the valle)^ 



This is proved by the fact that the stones in this unstratified and 

 disarranged material are of the same character as the stratified 

 beds, but that many of its contained stones are more waterworn. 



There is also a very much larger number of stones in this 

 material, in proportion to the quantity exposed, than exists in the 

 rocks from which it is derived, because, having lost much of the 

 finer sediment in process of re-deposition, it is generally (excepting 

 in cases of old land slips or creek wash) merely superficial, and 

 in the case of the 100ft. section some of the included stones 

 are angular fragments of the basaltic cap that overlies them. It 



