■l BOKAUO OOAL-FIELD. 



The portion of country occupied by the Bokaro' Field is com- 

 prised between 85° 30' and 86° 10' east longitude. 

 Position of field. ^^^ ^^o ^q- ^^^ 23° 50' north latitude, and covers 

 an area of 220 square miles. Its greatest length is in an east and west 

 direction, and is about 40 miles; its maximum breadth from north to 

 south does not exceed 6-| miles. 



The boundaries are distinct and well marked. Bordering the field 

 to the north is a chain of hills composed of gneiss 

 Bomidaries well marked rising in Some instances to a height of 3,000 feet 

 ^^ ' above the level of the sea. This continues unbroken 



from the eastern to the western extremity of the field, and then sweeps 

 round, taking a north and south direction, cutting oflP the coal measures 

 on the west. This chain is not an independent one, but is connected 

 witli the Hazareebagh table-land at intervals, where the activity of the 

 denuding forces has been less than at other places. 



The southern boundary is formed by another range of hills ; not 

 nearly so conspicuous and elevated a chain, however, as the northern 

 one. 



The physical appearance of the area constituting the field is, in 



the main, of that tj^e which repeated confirma- 

 Physical appearance. i. j. n , ■• . i 



tion over a large extent ot country has now estab- 

 lished as invariably characterising those regions occupied by the true 

 coal-bearing strata and their associated rocks. The Talchir, the middle 

 and upper divisions of the Damiida Series, and the Lower Panchets, 

 uniformly produce a level surface, w^hilst the Barakar or lowest group of 

 the Damuda Series, and the Upper Panchets, as constantly give rise to 

 massive hiUs, and rapidly succeeding hillocks and dales. 



The special feature of each formation is in this field admirably 

 exhibited, and the wide expanse of the main body of the coal measures 

 contrasts forcibly with the imposing mass of sandstones and conglome- 



(40) 



