GLACIAL DEPOSITS OF BACCHUS MARSH. 385 



with the stratification obscured, and this is repeated over several 

 miles of country in the direction of the dip as well as along the 

 strike. This has been observed and traced in over eighty places. 

 In many parts of what was the softer material the larger stones 

 and boulders have been dropped into it, and produced indentations 

 in the underlying stratum. The same paper mentions a section 

 below the falls of the Werribee Gorge, where the so-called " till" 

 is seen resting on the polished and striated surfaces of the Silurian 

 rock. " This is seen to thin out, forming a wedge-shaped mass, 

 and it is overlaid," it is acknowledged, " by the Triassic rocks." 

 This " wedge-shaped mass " is, in reality, precisely the same 

 class of rock as those reposing upon it, and contains similar 

 striated pebbles. This wedge-siiaped mass is at the site where we 

 first found the sandstone, &.C., lying unconformably on the Silurian 

 rock, and which we found to be stratified; its layers are parallel 

 with the line of its upper bed, so that they become shorter and 

 shorter as they descend, but are still approximately parallel with 

 the above line. The overlying acknowledged Triassic beds are 

 quite conformable Avith those in this \vedge-like mass. Its wedge 

 shape is due to the fact that it was laid down in a slight trough, 

 whose east or thin end, being nearer the surface of the water and 

 having an inclination to the trough, did not retain the falling debris 

 and sediment to the extent of the deeper part. Just as all falling 

 debris and sediment gravitates to the lower levels, in moving 

 waters, till the lowest depressions are filled up, so here the deeper 

 part of the hollow was first filled, the layers succeeding each other 

 till the level of the highest point was reached, after which the 

 layers were deposited equally over the whole area, the bottom 

 having become horizontal. 



In reference to the ground moraine supposed to have been 

 observed by them, we have been quite unable to detect any varia- 

 tion in the beds reposing on the Upper Silurian rocks as they 

 approach the latter, or any difliering material between the two. 

 They continue, to near or at the junction, to be stratified, and do 

 not correspond to the rocks over which, if a moraine profonde, 

 they must have passed under great pressure, but agree in their 

 contained material, as also in their stratification, with the rocks 

 above them — the so-called Triassic sandstones. 



In that paper it is considered that " it will now be seen that 

 here again are two distinct glacial deposits." One they consider 

 is " overlaid by the Triassic sandstones and conglomerates, and is 

 an ancient 'till' or moraine profonde^\ the other overlies the 

 Triassic sandstones, and is similar to the lower till, except that it 

 is not so hard, nor so traversed by joints. 



They acknowledge (page 54) that "the Triassic rocks and sand- 

 stone present in places a very hard texture, somewhat resembling 

 the 'till" below the Triassic rocks"; also that "four miles up 

 the Korkuperrimul Creek from the bridge on the Ballarat-road, in 

 b2 



