xcii Report of the Miner alogical Survey [No. 126*. 



202. From Peepul Point to Okuldoona, the route is in the bed of 

 the Casilla river, the latter being crossed eleven times ; every where it is 

 full of the rounded stones so often noticed, and their accumulations 

 are sometimes observed to attain a height of 150 feet even, above it. It 

 may be stated, generally, that where the river bed, or valley is narrow, 

 there they attain to the greatest height ; and where sufficiently wide, 

 the extent is greater, but their height less. What the depths of those 

 accumulations in the immediate bed of the river are, I have no data to 

 determine accurately, but there are several reasons for believing it to be 

 very great. They seem to be all of a very uniform character, modifica- 

 tions of quartz rock, more or less impregnated with clay slate. 



203. The rock in situ here is of a rather singular character, but it 

 will be here afterwards seen, that it is found in many distant parts 

 of these mountains. It is in fact a quartz rock, but contains talc instead 

 of mica. The strata are very obscure, although it is traversed by nume- 

 rous irregular seams. In one instance I observed a mass of clay slate 

 of a lenticular shape, inclosed in it, the length of this included nodule 

 was about 10 feet, the thickness one foot ; something like transition was 

 observed at the junction. This rock has a considerable extent in the stage 

 to Ookul Doonga. It is succeeded by a black amorphous rock of almost 

 impalpable composition, which is traversed by veins of quartz. This 

 passes into a talco-argillaceous schist with thin laminae, but so tender, 

 that no specimens are obtainable. Quartz rock of an ordinary character 

 next succeeds ; the strata very irregular and contorted. It is of a reddish 

 colour, and almost compact, and in mineralogical aspect strongly resem- 

 bles the boulder stones found at the foot of the hills. Fragments of the 

 talcose quartz rock which I have just noticed, and which is not seen 

 in situ in the intermediate space, have been observed at Dhikoolee, a 

 distance of at least 18 miles. This rock is so remarkable, as already 

 noticed, that its fragments are recognised with the greatest certainty, and 

 we are thus enabled to trace the course which these boulder stones 

 took, as also to judge of the distance they were transported. 



204. Ookul Doonga is situated on rather an extensive flat ; the bed 

 of the river is composed, as already noticed of these rounded, stones. The 

 rock is not therefore visible for a distance of a mile and a half ; it is 

 then seen in the river bed, and has the character of a micaceous fine- 

 grained sandstone, stratified distinctly, but not at all schistose, or at 



