184/.] VICARY ON THE GEOLOGICAL STRUCTURE OF SINDE. 343 



sizes. Near this place, in the bed No. 7, I found tolerably perfect 

 specimens of a species of Crab, and large but broken specimens of 

 Hypponyx, some portions of which were one inch and a half in thick- 

 ness. Further on I crossed the range, which, as I before stated, 

 loses its elevation and eventually disappears near Sehwan. To the 

 west there is a broad valley with numerous low isolated hills of 

 sandstone, and various coloured clays ; but I regret not having had 

 time to examine this place with attention. 



From Sehwan I moved across an alluvial plain to Treenee, a quar-- 

 ter of a mile south of the Munchal Lake, and about fourteen miles 

 west of Sehwan. The Munchal Lake at this season was about twenty 

 miles in length (east and west), ten miles in breadth, and is in many 

 places of great depth. I have no doubt that it was excavated in 

 former times by the Indus ; the southern side of the lake is for the 

 most part flanked by low hills, which turned the course of the old 

 stream sharply from a southerly direction to east, or perhaps the 

 northward of east, to pass the range of hills terminating near Sehwan. 

 The back-water caused by such a sharp deflection of the current I 

 suppose to have excavated the lake : during the season that the 

 Indus rises it still continues to receive a supply of water, but the 

 current is insignificant. The low hills near Treenee are composed of 

 indurated clays passing dovrawards into an arenaceous rock, and occa- 

 sionally capped with boulders derived from the conglomerate. Hence 

 for fourteen miles round to the western margin of the lake, my road lay 

 for the most part through the low hillocks above-mentioned. Alum is 

 obtained by digging in this formation somewhere near to this place 

 (Shah-Hussan), but the Sindee guides took care that I should not 

 see where they procured it. Hence N.N.W. to Gaza-Peer, seven 

 miles ; up to about the fifth mile, I was passing through these low 

 hills, and on approaching the Hala Range the beds are seen to be 

 capped with conglomerate, and eventually to sink down, the con- 

 glomerate only appearing at the surface. The latter rock in a short 

 time also disappears beneath the surface of a level plain two miles 

 in breadth, being the distance to Gaza-Peer. These small hills 

 belong to No. 2. of the Table, page 335, and are similar to those 

 mentioned as flanking the Sehwan range near Majindah ; they also 

 correspond with those near Ooch, north of Shickarpoor ; the beds 

 dip to the east at various angles from 20° to 35°. Gypsum is occa- 

 sionally found in the clays ; I made most diligent search, but was un- 

 able to detect a single fossil form. The yellow clay filling the valley 

 is perfectly level, and abounds with Viviparee, Pupae and Melanise ; 

 I could not obtain a section anywhere, but have reason to think that 

 the whole rests on the conglomerate. 



Fig. 3 



2 3 4 5 4 6 7 



1. Shah-Hussan. 5. Alluvial? valley, Gaza-Peer. 



2. Indurated clays. 6. Vitrified sandstone. 



3. Aluminous, gypsum rare. 7, Kurrachee rock No. 6. 



4. Conglomerate. 



