262 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 11, 



there is little change in the geological aspect of the country, — the 

 same sandstone beneath, and the surface covered with the same di- 

 luvial gravel. The only difference to be noted in the Jullock Pass 

 (the second sandstone range) is, that the sandstone is thrown up to 

 a greater elevation. It is identical with the Ooch sandstone, and is 

 capped with similar nummulitic boulders, while the base is the same 

 fine-grained sandstone as that just mentioned, without fossils*. The 

 elevation of the highest points above the pass is not more than 400 

 feet, but these elevations form a well-marked range parallel to the 

 limestone ranges on the north, and also parallel to the lower sand- 

 stone range flanking the Desert. The direction of the range is 

 nearly east and west, and the dip tolerably regular to about 15° 

 south, or a little to the east of south. There are numerous passes 

 through this range ; they are clefts formed at the time the sandstone 

 was upheaved, and the drainage of the mountains to the north is 

 effected through them. 



About six miles from the Jullock Pass, in a north-easterly direc- 

 tion, we enter the Mun Valley. We here find, first, low hills of 

 sandstone crowned with considerable quantities of rust-coloured 

 rounded stones, which have apparently been subjected to heat. In 

 some of these hills I remarked that the pebbles formed a distinct 

 bed again capped with sandstone. They contain an inconsiderable 

 quantity of iron, and have much the appearance of having been 

 ejected from a volcano. They are often fissured or hollow, or con- 

 taining red and yellow ochre, and occasionally sulphur, and even sand. 

 There are no distinct volcanic rocks in the neighbourhood, but I 

 noticed to the westward some small conical hills which I was unable 

 to visit. We next meet with a low range of hillocks distinctly stra- 

 tified, dipping at about 6° south, composed of a cemented dark- 

 coloured gravel, with considerable quantities of fossil bones imbed- 

 ded ; the bones exist in great numbers, and some were so large and 

 heavy that I found it impossible to carry them away. Proceeding 

 across the valley in a northerly direction, sandstone hills crowned 

 with the same rust-coloured round stones are again found, and it is 

 to be remarked that the nummulitic boulders are also spread over 

 these hills. Proceeding about a mile farther north, we come upon a 

 thin seam of boulder conglomerate resting on nummulitic limestone ; 

 the boulders are evidently rolled and waterworn portions of the num- 

 mulitic limestone beneath. I observed this conglomerate in many 

 other places of considerable thickness, and I have reason to think 

 that all the boulders and gravel overlying the sandstone hills and 

 outer valleys were derived hence. At Trukkee this conglomerate 

 attains a considerable thickness, amounting to several hundred feet ; 

 in other places it is replaced by the sandstone resting directly on the 

 limestone. 



Next in descending order comes the nummulitic limestone in situ ; 

 its usual colour is a very dark blue, in some places changing to a 

 grey, and in others, as at Doza Khooshtie, a pale yellow, and is then 



* I had no instrument for ascertaining heights. 



