TllK XAHAKAHS. 
172 
to ||1,780 foct. I did not ha[)peu to cross tho hoimdary of tliis 
field at oithor its eastern or W(!st(!rn end. Tlie luii^^lit of tlie 
Barakar-Talehir boundary on tlie southern edj^i; of the Sanhat 
field varies, as far as my observations ^o, from about l.KfjO 
feet near Rakeya on the east throu<i,li 2,000 — 2,150 (Kuro— Hill) 
feet in the neif^hbourhood of Najjar in the middle, to oidy l,G'l(» 
feet near Halbahara on the west. On the averaf^e, therefore, it is 
only a little higher than the southern boundary of the Kurasia 
field. Since almost everywhere along the southern boundary of 
the Sanhat field, there is a marked northerly dip ranging be- 
tween ()° and 20', and averaging about 10" to 12°, it is obvious 
that if this dip liad continued to the south in tliose portions 
of the Barakars that once joined the Sanhat to the Kurasia coal- 
field, the Kurasia field would have been at a much higher 
level than it actually is. The rocks of the Kurasia field are, 
as a rule, approximately horizontal with local dips in various 
directions due to slight rolHng ; but taking the accumulation of 
evidence provided by the numerous dips recorded, there is evidently 
a slight tendency towards a southerly to south-westerly dip. The 
evidence, therefore, of the respective elevations of the bases of the 
two coalfields and the general direction of dip indicate the former 
existence of a gentle anticlinal fold, the axis of which probably 
lay in those portions of the Barakars, now removed by denudation, 
that formerly joined the two coalfields. 
A reference to the geological map brings out a most interesting 
point, namely, that the largest exposed spreads of the dolerite 
sill already discussed on p. 156 lie in this very gap between the 
two fields, whilst the line half way between the two fields, 
which is approximately the position where one would feel inchned 
to place the anticlinal axis already referred to, happens to be 
occupied by the dolerite dyke indicated on p. 158 as the probable 
fissure up which rose the lava forming the intrusive sill. It 
seems, therefore, a reasonable suggestion that the intrusion of these 
dolerites was the cause of the folding of the Barakars. If this 
deduction be correct, then we must regard this doleritic intrusion 
as the principal cause of disturbance in the coalfields of this State. 
Consequently, when in the future these coalfields come to be 
worked, as they must be sooner or later, it will be a point of 
practical importance to the miner to make an exact study of the 
relationship of the dolerites to the Gondwanas, as thereby he may 
