MEMOIRS 



OP THE 



GEOLOGICAL SUEVEY OF INDIA. 



Tie Karanpi^ra Coal-fields^ hy Theo. W. H. Hughes^ f. g. s.^ Assoc, 

 Roy. School of Mines, Geological Survey of India. 



Tlie description in this memoir of tlio Karanpura coal-fields, brino-s 

 to an end the history of the mineral wealth of the Damudd valley, in 

 connection with its coal and iron-bearing deposits, which was com- 

 menced by the issue of the report on the Ranig-anj field, and systemati- 

 cally continued in those of the Jherria, the Bokaro, and the 

 Ramg-arh fields. 



The total area of all the Damuda coal-basins is about 2,000 square 

 miles, estimated as follows : — 



1. 



Eaniganj ... 



1,000 



square miles 



2. 



Karanpura... 



472 





3. 



Bokaro 



220 





4. 



Jherria 



200 





5. 



South Karanpura 



72 





6. 



Eamgarh ... 



40 





The size of the Raniganj field is stated approximately. Its known 



area is 600 square miles, but there is every reason to suppose that it 



extends for many miles eastward beyond the furthest known point in 



that direction. The areas of the other coal-basins are accurately given, 



as they diff'er from the Raniganj field in having their boundaries 



definitely terminated by the appearance of the crystaUine series, which, 



in the Damuda valley, forms the floor upon which the coal measures and 



their associated rocks rest. 



( 285 ) 

 Memoirs of Geological Survey of India, Vol. VII, Art. 7. 



