92 READER : REPORT ON THE RAMPUR COAL-FIELD. 



as reasonably certain that two borings to a depth of 500 feet would 

 give the same information as one to a depth of 1,000 feet, and if 

 strong evidence existed in favour of this conclusion, to mark the 

 exact position at which the second borehole should be drilled with 

 reference to the one under discussion. The examination did not 

 answer this question and it was considered a better plan to select a 

 site near Dhoramuda practically at the top of 



Dhoramuda borehole. . 



the Barakars and bore through the whole thick- 

 ness of the Barakars on to the undoubted Talchirs or metamorphics, 

 as the case might be, it being then estimated that the total depth 

 would probably be below 800 feet. A borehole was put down 

 here to a depth of 828 feet and passed through several shaly coal- 

 seams finally stopping in the zone of Barakar rocks exposed, I think 

 in the Lillari nala near Piplimal and several hundred feet above the 

 top, geologically speaking, of the Kodopali (No. 4) borehole. It will 

 therefore be seen that the lower measures of the Barakars have not 

 been proved as was intended. 



Before setting out for this area I was supplied with the one inch 

 to a mile topographical map. It was my inten- 



Topographical Map. 



tion to put this map on a larger scale to make 

 a working plan. Fortunately time did not permit of my doing this 

 in Calcutta, for in the course of preliminary work in the field I was 

 forced to the conclusion that the map was absolutely unreliable and 

 not sufficiently accurate for recording geological observations. 



The sketch-plan accompanying this report is one 1 made myself. 

 It is the result of a loose needle survey made 

 with a 2h inch prismatic compass held in the 

 hand. The chaining was done by my chaprassis who had never seen 

 a chain before ; any inaccuracies it may be found to contain, and I 

 am alive to some, will therefore be readily understood. I did not 

 intend at first to resurvey the whole area, but only the most crucial 

 portions of it and join these on to the Atlas sheet. But when I 

 found the latter so incorrect I was forced to complete the work for 

 the purposes of this report. Only ten weeks were spent in this 



( 4 ) 



