THE DAMUDA SERIES. 39 



General Geology. — The same three series occur in this field as 

 in the Karanpura, with the exception that no Lower Panchets exist. It 

 will be unnecessary for me to refer to the litholog-y of any of the series. 

 Each is represented by beds similar to those of the larger field. I shall 

 therefore confine myself almost exclusively to remarks upon the coal 

 seams of the Barakar and Ranig-anj groups. 



Talchie, Series. 



There is exposed of this series about half a square mile at the 

 extreme east end of the field and a small strip near Raligarha. In the 

 first of these a section is seen in a river not marked on the revenue 

 map, but which is not more than a mile west of Hasla. 



Purple shales and the conglomerate bed are the best developed. 

 The sandstones are poorly represented. 



Beyond the actual boundary marked on the map there are the 

 pebbles and boulders of the conglomerate lying loose upon the gneiss : 

 marking the former extension of this series. An interval indeed of not 

 more than two miles separates the south Karanpura from the Ramgarh 

 field. 



Damu'da Series. 



This series is represented by its three groups. The rocks are usual!}'- 

 inclined at moderate angles, and the only high dips occur where' faultino- 

 has taken place 



The unconformity of overlap between the different groups is as 

 well illustrated as in the other fields. The ironstones are extremely well 

 developed over a small tract, but die out rapidly to the west. 



The total area of the Damiidas is 67 square miles. 



Barakar ffroup.—lR this field this group seemingly contains much 

 more coal than in the Karanpura. I suspect this is due to clearer 

 natural sections being exposed than to the actual existence of a greater 

 quantity of coal. And I feel inclined to accept the evidence afforded by 



( 323 ) 



