800 
MANGANESE DEPOSITS IN INDIA : DESCRIPTIVE. [ ParT IV: 
alignment, due either to a fault or a very sharp change in strike, and 
extend S. W. for another nine miles through Gosalpur to Marhasan 
and Chindamani. The width of this strip of rocks varies from three 
to five miles. Roughly speaking the outcrop takes the form of a 
lenticular patch of slaty shales and banded hematite-quartzites, flanked 
on both sides by massive quartzites. 
' The shales and micaceous hematite-banded quartzites form a distinct synclinal 
(which we shall call the Lora syncline) just west of Gosalpur, their dip at Gosal- 
pur pointing north-north-west and at Ghugri in the opposite direction. In 
the south-western direction the syncline is traceable to Murhasan and Khorawul, 
the micaceous, — hematite-banded quartzites, or hematite-quartzites, as they may 
be more conveniently called, forming two broken parallel ridges, and the shales 
superposed on them, the valley between. North of Gosalpur, the synchne is more 
or less distinctly traceable to the Lora range proper, where the rocks are greatly 
folded and contorted. 'i 
The above-mentioned beds constitute Bose's Sihora beds, and the 
massive flanking quarzites are his Gosalpur 
The Sihora beds. . i , , 
quartzites ; he supposes them to pass under 
the Sihora beds, though signs of bedding are very difficult to find in 
the Cosalpur quartzites. According to Bose the sequence of the 
Sihora beds is as follows (in ascending order) : — 
' 1. Slaty shales. 
2. Thin laminated quartzites usually of a jaspery type, and often parted by 
layers of micaceous iron ore interstratified with shales. 
3. Slaty shales, usually sheeny and tinted red.' 2 
White talcose shales occur interlaminated with the other shales and 
hematite-jaspers, and also in separate beds. 
The banded hematite-jaspers are most strongly developed in the 
Lora range. The typical rock is composed of 
Hematite-ja.spers. . ti.ii i 
altematmg bands of a reddish, lavender, or 
whitish, jasper or jaspery quartzite, and of a schistose micaceous 
hematite splitting easily along the schistosity planes so as to show 
a shining satiny lustre (see Plate 9). The rock is often extraordinarily 
contorted, and when this is the case bands of jasper or hematite are 
frequently seen to thin or thicken in a lenticular fashion, or even to 
pinch out entirely, this being possibly a result of the contortion. This 
1 Bose, Rec. G. S. I., XXII, p. 218. 
2 Ibid; p. 220. 
