Chap. XXXV. ] 
JABALrUR DISTRICT. 
805 
agreement with Mr. Bose's descriptions and conclusions, except on the 
one point of the quantity of ore available. With regard to this, I 
think Mr. Bose has in most cases overestimated the amount of mer- 
chantable ore that the evidence obtained from the pits and trenches 
dug justifies one in expecting to be present. 
Mr. liose has given an excellent geological sketch of this area, 
and published with his first paper a geological 
Geology. ^ , ^, ' ^ , 
map 01 the manganese area showing the distribu- 
tion of the various manganese -ores. The geological part of this map is 
largely based on a map made by Mr. C. A. Hacket in 1871. But 
certain alterations were made by Mr. Bose, and the localities for mang- 
anese-ore are, of course, all his own additions; and for most of the 
locahties mentioned in this chapter I will refer the reader to Mr. Bose's 
map. 
The manganese- and manganiferous iron-ores occur in two formations, 
namely, in laterite and in ' transition ' rocks. The 'transition^ rocks have 
been previously described as Bijawars ; but in view of their extremely 
metamorphosed condition and general Hthological resemblances, there is 
reason to suppose that these rocks are really of Dharwar age, and as 
such they will be referred to here. These so-called Bijavars were 
divided by Mr. Hacket into four groups as follows : — 
1. Chanderdip group. 
2. Lora ,, 
3. Bhitri 
4. Majhauli 
Practically all the ores occur in the Lora group, though Mr. Bose 
gives three localities for pyrolusite in his Majhauli-Bhitri group. Mr. 
Bose subdivides the Lora group into two divisions : — 
1. Sihora beds, 
2. Gosalpur quartzites, 
the Sihora beds being the overlying rocks. 
The manganese-bearing area of the Lora rocks stretches S. S. W. 
from theE. end of the Lora range of hills to Sihora and Paharewa, adis- 
tanceof nine miles. Here alluvium supervenes for about two miles, and 
then the same rocks appear at Naigain, with a marked shift in their 
o 2 
