SYNOPSIS OF PART II. 
Ixxv 
as in Goa, Belgaum, and Jabalpur ; and possibly the ores being 
worked in Baluchistan ; but about the latter deposits I have no trust- 
worthy information. 
[CHAPTER XII.] 
The Kodurite Series of Vizagapatam and Ganjam. 
The rocks of the Vizagapatam district are divided into the follow- 
ing groups : — 
1. Kodurite series. ^ 
2. Charnockite series. [• Igneous. 
3. Gneissose granite. 
4. Calc-gneisses. ") 
r iri 1 Ti. • f Metamorphic. 
5. Khondalite series. J ^ 
6. Contact products of 2 and 5. 
The evidence obtained is held to point to the intrusive nature of 
the rocks of the kodurite series with regard to the khondalite series 
and the calc-gneisses. The evidence in favour of the igneous origin 
of the kodurite series is summed up as follows : — 
1. The mineralogical and chemical composition of the rocks, 
which could be explained only with difficulty on any other 
hypothesis. 
2. The signs of magmaiic differentiation found. 
3. Some masses of crystalhne limestone at Kodur supposed to be 
xenoliths. 
4. A pegmatoidal variety of the kodurite series at Ramabhadra- 
puram. 
5. The varying horizon that the rocks of this series occupy in 
the succession of calc-gneisses and khondalites. 
6. The fact that in two cases, Chintelavalsa and Taduru, they are 
also associated with rocks that probably belong to the 
charnockite S3ries. 
The typical rock of this series is that designated kodurite after the 
Kodur mine. It is composed of potash-felspar (orthoclase), man- 
ganese-garnet (spandite), and apatite, in varying proportions. Other 
members of the series receive their names in accordance with the 
