G94 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRT IV : 
extremely aluminous and then designated bauxite — resting partly on 
the Chilpis and partly on the metamorphic and crystalline series, especially 
in the neighbourhood of Laugur, Ukua, Samnapur, and Sonpuri, the 
whole of the belt consists of Archaean rocks. These can be divided 
into three groups : — 
(1) the Chilpi Ghat series ; 
(2) the metamorjihic and crystalline series (designated Baihar 
gneiss by Bose); 
(.3) the intrusive granites (designated Chauria gneiss by Bose and 
probably equivalent to the Bundelkhand granite). 
The granites are of subordinate importance in this belt, but 
according to Bose, they occupy wide spreads of country to the south- 
east. 
The Chilpi Ghat series* consists, where I have seen it, of slates, 
phyllites, and mica-schists, with some quartz-schists and schistose grits 
or arkoses, and is probably to be identified with the Dharwars. The 
areas occupied by it are shown on the map (Plate 43). The band stretch- 
ing from Waraseoni through Laugur to Tipagarh hill is apparently a 
synclinal fold of these slaty and schistose rocks, resting on various schis- 
tose gneisses with granite intrusions along the bedding planes of the 
gneisses. The manganese- ore deposits Nos. 9,10,11, and Kurthi-tola, are 
situated near or at the base of this series, as are possibly Jairasi, Dharam- 
pur, and Kanaridha, further to the east. The deposits are overlain by 
the phyllites and schists and rest on the schistose conglomeratic grits 
JOT arkoses. At Balagliat itself these grits are easily distinguished ; 
but at Ukua, some 16 miles to the north-east, the rocks are much more 
metamorphosed so that the grits now look like crystalline gneisses ; but 
their original character is betrayed by the pebbles of gneiss, granite, 
and quartzite, in the gneiss. Judging from this and other evidence 
it seems probable that a considerable portion of the rocks mapped as 
part of the Archaean gneisses and schists (coloured pink on the map) 
are only more intensely metamorphosed forms of the Chilpis. See 
pages 311 — 314. 
The metamorphic schists and gneisses consist of muscovite- and 
biotite-gneisses, mica-schists, quartzites, various more basic pyroxenic 
and epidotic gneisses, and occasional hornblende-schists. With these are 
*0r rather the portion included in this belt ; for it is not certain that two distinct 
groups of rocks have not been included in this scries. See article on geology in the Bala- 
gliat Gazetteer, pages 16 and 17, (1907). 
