21G Report on the Progress of the Magnetic Survey. [No. &. 



Geology. 



The greater part of the plains of the Punjab is filled with clay, 

 which generally abounds with shells, not only on its surface but 

 also at greater depths. 



The thickness of the clay is very different in different localities, 

 it very often is found to be only 6 feet deep, and under it sand is 

 found resembling the sand of rivers. In other localities it is more 

 than 20 feet thick with a layer of sand only a few feet deep, under 

 which clay is met with again. 



No shells are to be fouud in the sand, but as already mentioned, 

 they abound in the clay. 



I especially endeavoured during my journeys in the Punjab to 

 collect shells from the surface and greater depths, samples of sand, 

 of sands of rivers, &c. 



I had an opportunity of obtaining numerous and well preserved 

 specimens of fossil shells in Sukkur and Eori in Upper Sind, and 

 made, assisted by the draftsman, Eleazar, a large collection of 

 shells and petrified wood near Sehwan and in the hills on my route 

 down to Kurrachi. 



I hope that these collections combined with the observations, 

 taken on the spot will render it possible to ascertain with accuracy 

 the age of the formation, but it would be premature to venture an 

 opinion before a decided examination has been made. 



There are several hot springs in this range of hills, and I had the 

 opportunity of visiting those of Sukki near Sehwan and of Mugger 

 Pir near Kurrachi. 



In both localities the quantity of water which issues, is pretty 

 considerable, and is extensively used by the natives for medical pur- 

 poses. 



The temperature of the springs at Sukki which take their origin 

 three miles west of Sukki is 41'2° Cent., that of Mugger Pir, close 

 to the" Alligator Tank," is exactly the same 41'2° Cent. 



Bhooj, in Kutch, 16th March, 1857. 



