TABLE-LANDS, &C. 5 



Gerwa hill is the only one of any dimension that does not lie in 



he strike of the others. It is adjacent to the 



southern boundary in the west corner of the field. 



In discussing the rekdons of the different rock groups^ I shall refer 



again to this hill. 



Beyond the field, the most important and conspicuous of the 



TT ' -1,^ T. J ou i.x elevated areas, are the Hazaribaorh and Chota- 

 Hazanbagli and Chota- ' ^ 



Nagpur table-lands. NagpuT table-lands, which form, respectively, the 



northern and southern natural physical boundaries of the coal-measure 

 series. Their general height above the sea is 1,900 to 2,000 feet 

 above the sea. 



As the Hazaribagh table-land extends westward, the difference 

 between its average level and that of the low lying ground of the 

 valley, decreases ; and a perceptible narrowing in its breadth is observ- 

 able about the meridian of Hessatu."^ 



Accompanying this circumstance of narrowing, it is noticeable that 

 the coal-measures facing the northern scarp of the table-land, approach 

 nearer to those at the foot of the southern scarp ; and I think it pro- 

 bable that they once closed round the extremity of the table-land in 

 the vicinity of Katkamsandi.f 



The Chota-Nagpiir table-land extends in a well-defined and uninter- 

 rupted manner much further to the west than the valley of the Damuda. 

 It forms the natural physical boundary of the south Karanpura, as 

 weU. as of the Karanpura^ field, and it may roughly be assumed to be 

 the limit of the coal-measures in the valley of the I/ranga. 



The western range that borders the Karanpura area is not 

 continuous. It consists of separate hills, some of which rise high above 



* A village twenty-five miles distant from HazSribagh, and in a direct west line. 

 t This village is not included within the limit of the map accompanying this memoir. 



( 289 ) 



