Chap. XV.] 
GONDITE SERIES IN JH^Bm. 
319 
then the shape ot the original basin must have been a somewhat 
curious one, with very steep banks. This might mean that the basin was 
one abutting against a hill remaining from the pre-Dharwar land surface ; 
but it more probably means that the shape of the original basin has 
been distorted by the earth movements to which it has been subjected. 
Another example of this very rapid thinning out of the manganese ore 
band is the Gaimukh deposit, a rough sketch of which is given on page 
782. If we explain this sudden thinning out of certain deposits in 
the way suggested above, namely as due to distortion during tectonic 
movements, then it is difficult to avoid the supposition that in at least a 
few cases the pressure has beea sufficient to squeeze out the ore-bands 
into separate lenticles. The formation of a few separate lenticles in this 
way is not to be taken as negativing the explanation given above of the 
shape of the bodies of water in which the manganese- ores were laid 
down, but rather as modifying that explanation shghtly. 
It is obvious that if it be the case that there is a manganese-ore 
T> ,. t horizon situate near the base of the Chilpi series. 
Prospecting tor . . . ^ 
manganese-ore at the it Ought to be possible to make use of this fact, and 
base of the Chilpis- f^^.^ ^gg^ carefully prospecting along the 
lines that are marked in the map of this area (Plate 43) as boimding the 
Chilpi series from the remainder of the Archaean complex. The region 
especially favourable for this purpose is, of course, the southern portion of. 
the Balaghat district and the adjoining parts of the Bhandara district. 
The Gondite Series in Jhabua. 
The occurrence of the rocks of the gondite series that I was able to 
examine at Kajlidongri in Jhabua State, Central India, and which, as has 
already been noticed on page 283, is enclosed in rocks that are to be re- 
garded as a southern extension of AravaUi system of Rajputana, is very 
similar to the occurrences of this series in the Central Provinces. It is 
folded up with rocks that may variously be called phyllites or mica- 
schists, according to the stage of re-crystaUization they have reached. 
The ore-body itself consists of layers of manganese-ore interbanded with 
red vitreous quartzites identical in all respects with the red quartzites 
that occur in the ore-body at Balaghat. This red quartzite is very fine- 
grained and is seen imder the microscope to owe its colour to clouds of 
minutely divided red dust collected in clouds in the interiors of the grains 
of quartz. These clouds are usually centrally disposed in their respective 
