6hap. XXXV.] 
JABALPUR : SAKRI. 
being left untouched. And most of the ground opened up shows talus 
only, the trench not having been carried deep enough to reach rock 
in situ. Consequently, only a very small proportion — about fiO feet-of 
the 230 feet of manganiferous hematite recorded by Mr. Bose, can be 
regarded as in situ ; and the value of this occurrence is not therefore 
as great as Mr. Bose's description might lead one to expect. I took a 
sample (No. G!)) from each of the sections of the trench, except the 
last recorded by Mr. Bose. The result of the analysis of this sample 
is given on page 809. The sample included some pieces showing visible 
residual quartzite, which could have been cleaned out so as to give a 
better result. A little of the ore showed visible psilomelane. 
The trench noticed above is situated on the eastern side of the N. — 
S. ridge at this place. The chief rock visible on this ridge is the banded 
jasper-hematite, the strike of which is E. by a little N., with a fairly 
steep southerly dip. On the portions of the ridge lying to the west of 
the trench the rocks have been replaced at the surface with the forma- 
tion of limonite, as at Kasai Hill and Mansakra. This limonite often 
contains the small magnetite grains that presumably once formed a part 
of the rock that has undergone replacement, and usually retains the 
original schistose or slaty structure of the rock that has been replaced '> 
but some of it is of the chert-like variety. The limonite is often tra- 
versed by thin veins of psilomelane. From this limonite I took a 
Sample (No. 65), an analysis of which is shown on page 815. To the 
north of this portion of the ridge there is a band of rock very rich in 
magnetite. It shows bands of jasper, magnetite-bearing hematite, 
magnetite-bearing argillaceous rock, and very often of magnetite alone. 
On the S. W. -running spur from the north end of the ridge men- 
tioned above there are hematite-quartzites and hematite-schists, and 
various coloured slaty shales. The hematite is often highly mangani- 
ferous, and in some cases has been converted into psilomelane. Thg 
shales are also often blackened, owing to the impregnation and partial 
replacement of the rock by manganese oxide. A portion of the com- 
pletely blackened shale was found to have a specific gravity of ."-33, so 
that evidently it has not all been replaced, but must contain a consi- 
derable amount of residual shaly matter, in spite of the black colour of 
the rock. I took here a sample (No. 66) of the psilomelane and the 
