Chap. XV.] 
GONDITE SERIES : ORIGIN. 
3lt 
deeply buried portions of the folds into which the Chilpis were 
thrown at the end of the period of sedimentation have here been exposed 
by the denuding agencies of nature. Were two horizontal sections to be 
constructed across a series of folded beds of rock at two levels, the one 
nearer the surface might only cut a certain bed, such as a layer of manga- 
nese-ore for example, twice, namely, on the two outer edges of the fold. 
But at a lower level towards the base of the main trough formed by the 
fold, the simple fold would probably be complicated by a series of minor 
folds. This crinkling of the base of the trough would cause a line of sec- 
tion near the base to cut the ore-layer several times. Thus in figure 21, a 
section at the level AB would only cut the ore-layer in two places, namely, 
A and B, and the manganese-ore body would be of the less metamorphosed 
type like that of Balaghat. But a section at the level CD would cut the 
ore-layer several times, in the figure iJ times, and the ore-layer would be of 
the highly metamorphosed type like those of the metamorphic and cry- 
stalline complex!. From this it is evident that the fact that there are 
several roughly parallel ore-bands in the more metamorphosed portions 
of the Archaean complex of this area does not conflict with what would be 
expected if there were only one ore-horizon. This does not, however, 
obviate the fact that the existence of several ore-outcrops could also be 
explained by the actual existence of several ore-horizons. I do not here 
give a definite expression of opinion one way or the other, except to say 
that it certainly seems more probable that the repetition of the ore-bands 
in the more metamorphosed parts of this area is due to the bringing of a 
1 Rocks that were only buried to the depth represented by the line AH possibly 
did not get below Van Hise's upper zone of katamorphism ; whilst rocks that reached 
the depth represented by the line CD probably entered Van Hise's lower zone of 
anamorphism. 
► 
Fig. 21. — Idenl section across a syncline of manganifcrous rock. 
