Vol. I, No. 9.] The Geology of the Gangetic Plain. 235 
N.S 
h 
might be supplied through a deposit of sand in the former river- 
bed continuous up to a point in its uppper course where it attained 
the necessary elevation. . 
The observed facts at Lucknow do not, however, support this 
explanation, as there were several rises in the level of the water in 
the borehole, and it seems unlikely that one borehole should have 
struck the beds of several such former rivers one above the other. 
The second possible explanation is that the surface deposits 
were laid down in running water and the deeper deposits in still 
water. Anyone acquainted with the country can see in the cres- 
Seems necessary to assume the existence of an enormous : 
Water with currents sufficient to transport sand great distances 
to mgr for the phenomena 
] 
€ . 
* 8eologically recent period ; and it seems possible that it may have 
€xtended east much farther into the gangetic plain than 1s usually 
upposed, 
he absence of any indications of marine origin in the upper 
Strata might well be due to their having been deposited in fresh 
‘ore a the communication with the sea by the Indus valley 
n cut off, . 
. .Atany rate, whether the water was fresh or salt, the con- 
tinnity of the deeper strata over great distances seems to strengthen 
the theory that the lower strata were deposited in a great sheet of 
Still water, 
Such a great sheet of water, origi 
tion wi 
re and more obstructed, wou 
we of the salt-water porpoise into an animal inhabiting fresh 
r, | 
