O'Eeilly — On the Correlation of the Lines of Faulting, ^c. oil 



I. — A line drawn at 70° witli the BelucMstan coast-line great 

 circle, and passing through Murwaie Kullan, defines the eastern side 

 of the coal-field. 



II. — A line drawn at 40° with this gives very distinctly the 

 northern boundary of the coal-field, over an extent of sixteen miles. 



III. — A line drawn at 40° with the Beluchistan coast-line great 

 circle (from "W. to E.), and passing near Hurtah, in the north of the 

 map, gives the direction of the mountain chain passing near this point. 



IV. — The line at 30° with this, and consequently running nearly 

 due east and west, gives the direction of certain of the sets of joints in- 

 dicated in the southern part of the map, as also the southern boundary 

 of the Mahadeva Eocks, marked Bitwa. 



Taking now the second direction, that at 40°, with the eastern 

 coast-line great circle, or as I termed it, the 88° "VV. of JST, line : — 



Y. — A parallel to it gives a well-marked direction of jointing 

 passing near Tataha, and running nearly east and west. The coinci- 

 dence over the principal portion is distract. 



YI. — In the north of the coal-field this direction corresponds with 

 that of certain of the Trap dykes marked thereat. 



The line of jointing running IST. JST.W. and S. S. E., by the Munga 

 Hills, I do'not see how to correlate distinctly with either of the above- 

 mentioned principal directions, that is to say, to within four or five 

 degrees. 



YII. — Taking the map of the Aurunga coal-field, and tracing on 

 it the two directions already employed (that is, the Beluchistan coast- 

 line great circle, and the 88° W. of iS". line), there is immediately 

 obtained the direction of the very marked jointing which runs from 

 B-ukhaut, in the south-east, to Obur, in the east centre, an extent of 

 eleven miles. This line is slightly inflected, and presents, as traced 

 on the map, two directions — the one concords with the line at 40° 

 with the Beluchistan coast great circle, and the other with the line 

 making the same angle with the direction 88° W. of JN". 



YIII. — The two main lines of direction (Beluchistan coast and 

 88° "W. of IST.) give very distinctly parts of the east and west line of 

 jointing, which runs from Bampur to Tuppah. 



IX. — They also define the system of jointing with hot springs, 

 which runs east and west between Joreesuklowa and Punkra, towards 

 the northern limit of the coal-field, the length between the extreme 

 points being nine miles. 



