1110 
MANGANESE DEPOSITS OF INDIA ! DESCRIPTIVE. [ PaRT TV 
Another interesting rock seen in one of these pits is a band of quartz- 
microcline-rock 4 feet thick with a sort of 
Aratitoqu irtn-micK) a -i i i x j.i i ^■ 
oline-rock. tliiiaal Structure, trie rock suggesting a pegma- 
tite that has moved at the time of solidification. 
Since a few grains of greenish blue apatite up to s inch long can be seen 
n both the quartz and the felspar, while under the microscope many 
smaller grains can be seen included in the quartz, it seems probable that 
this rock is a part of the kodurite series. 
20c. Bankuruvalsa (East Mound). 
One pit, 20 feet deep, showed very disturbed laminated quartzites 
forming a sort of anticline, in which the central portion was laminated 
lithomarge, wad, and decomposed quartzite, with segregations of pyrolus- 
ite forming pockets here and there. 
In a larger pit to the east of this the ore-band is at least 15 feet thick, 
^ ^ ^ . . the dip being 30° to the south. It is overlain 
(Juaitzites containing . 
apatit?, garnet, and gra- by a fine-grained granular quartzite containing 
^'^'^^^ an abundance of minute apatite prisms in the 
quartz grains. Some bands of the rock contain an abimdance of minute 
pink garnets, while a layer resembling vein-quartz contained graphite 
scales up to nearly i inch across. 
21. TdduFu. 
{See Plate 55.) 
My attention was first drawn to this locality by Mr. C. S. Middlemiss 
of the Getlogical Survey of India, who had found numerous externally 
blackened boulders, of rhodonite and other manganese-silicates, lying 
in the valley down which a little stream flows from near Wodangi, past 
the village of Taduru or Tadiyur (Tadur on map). 
As the result of a careful search I was able to trace these pebbles 
and boulders to their source, namely a band of manganese-silicates 
situated on the hillsides at a point about 1| miles due south of Taduru. 
The way to find this outcrop is to go up the valley from Taduru by a 
path that constantly crosses the iittle winding stream. At the 9th ford 
there is a 14-foot waterfall over a rounded surface of gneissose granite. 
This fall, as seen at the end of December, was of very small volume.leav- 
ing most of the granitic surface dry. Gradually ascending from here 
