4 HAMGURII COAL-FIELD. 



The total area of this field does not exceed forty square miles ; its 



Area. greatest length in an east and west direction is 



fourteen, and its greatest width north and south about eight miles. 



Towards the western boundary; or in the neighbourhood of Ramgurh, 



^ ^ ,. ,. the rocks have been much disturbed and thrown 



Western portion ais« 



*"''^^*^' by faults. In the remainder of the area however, 



they have only been to a small extent affected in this way. 



As in all the other Damoodah valley coal-fields hitherto described, 



the southern boundary, or the chief part of it, has 

 South boundary, a fault. n i ^ o ^J^ t, • j ^^ 



been formed by a fault. Its maximum downthrow, 

 has been sufficient to bring down but a fraction of the full thickness of 

 u^jper Damuda rocks to a level with the metamorphic series ; indeed, 

 perhaps, strictly speaking, the existence of these beds at present is more 

 directly due to a cross fault, as will be explained in the sequel. 



No trace of the Panchet series remains, all haviog been swept away 



by the denuding forces, from the full action of 



Panchet scries absent. 



which they were unprotected. 



Owing to the peculiar way in which the rocks have been cut off by 



the southern fault, it is extremely difficult, except 

 Thickness of groups. 



in the case of the Ironstone-shales, to estimate, 



with any degree of certainty, the thickness of the several groups. 



The following is as near an approximation as can be made : — 



1. Talchxr series ... 850—900 feet. 



2. Damuda „ 



Bardkar group 3,000?,, 



Ironstone-shales „ 1,200 „ 

 Eaniganj „ ? 



II. — Talchir series. 

 The rocks which compose this series are all well represented in the 

 Ramgurh field ; although occupying an area which 

 is small as compared with those of other fields, 

 still good sections are abundant in which every variety of bed; from the 

 silt-shales to the boulder-conglomerate, is found. 

 (113 ) 



