122 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 
the gulf, moreover, it is probable that the drainage of the country 
to the west of Malwa found its way to the ocean in a south-westerly 
direction, and that that upheaval diverted it to the north, as seen 
by the course of the two principal tributaries of the Myhee, the 
Panum and Unnas, which join that river before it takes its final 
bend to the south-west. The original slope of the country in that 
direction from the time at which it began to assume its present 
general configuration, may be inferred from the position of the 
granitic and other formations mentioned. The northerly course of 
these two tributaries of the Myhee, the tilting up in the same direc- 
tion of the metamorphic rocks to the north of Dohud, and the ex- 
istence of a large freshwater limestone formation in the same neigh- 
bourhood, in the country between the trap and metamorphic rocks, 
point to the sudden diversion of the drainage of the tract to the 
west of Malwa towards the north, and the formation of large fresh- 
water lakes. The existence of these is proved by specimens contain- 
ing Bithynia, Paludina, and probably imperfect remains of Physa, 
possibly of the same age as those from Nagpore collected by the late 
Mr. Hislop. This formation, however, has only been very cursorily 
examined by me in the course of hurried official visits, and may yet 
yield far better specimens than those now before me. 
As soon as the gulf assumed somewhat of its present form, the 
access of water to it from the north-west having become cut off, the 
process by which it is now being rapidly silted up must have com- 
menced. This has been of a twofold nature, namely, the bringing 
down of alluvium by the Saburmuttee, the Myhee, the Nerbudda, 
the Taptee, and other smaller rivers, and the deposit of silt by the 
action of the tide. The gulf being somewhat funnel-shaped, the 
bore runs up it with considerable force, leaving behind it as the 
tide glides down again towards the ocean a deposit clearly visible to 
the naked eye. When this silting first commenced at the head of 
the gulf the rivers flowing into it from the east could not have had 
sufficient time to bring down the enormous amount of alluvial deposit 
now found along that coast, and mostly derived from the denudation 
of the traps. The Nummulitic and more recent formations between 
the Nerbudda and Taptee, and on the opposite coast, near Gogo, 
with which the Island of Perim was probably connected at no very 
distant date, would thus have found time to accumulate. As the 
silting process extended, the limits of the sea would be thrown further 
back, the older rocks on the west and north-east of the gulf would 
be the first enveloped in the silt, and finally the Nummulitic and 
more recent formations would be left high and dry as the silt en- 
croached upon and narrowed the gulf. We should then be approach- 
ing the time of man’s appearance on earth; and recent discoveries of 
stone implements in India, especially those in the Madras Presidency 
by Mr. Foote, have rendered the minute examination of the geology 
of that period in Western India of great importance. The formation 
in which Mr. Foote has found these objects is said to be laterite, 
which he is of opinion must have been deposited in a shallow sea. 
Interesting questions, therefore, at once arise as to whether that 
