90 GILPIN PICTOTJ COAL FIELD. 



One of these boundary faults runs from a point above McNaugh- 

 ton's mills on McCullock's Brook, to Parks' mills on Sutherland's 

 River, and has Coal measures to the north, Millstone grit and older 

 rocks to the south — thereby limiting the extension of coal crops in 

 the latter direction. Another fault, or rather succession of faults, 

 forms the western boundary of the Coal field, and produces a similar 

 effect on the coal strata in that locality. 



A short distance to the south of the Stellarton Station, Sir W. 

 Logan has laid down what he calls the McLeod fault, and describes 

 as an upthrow to the south pursuing a course roughly parallel to 

 that already mentioned and known as the south fault. The evidence 

 of the presence of this fault on the west side of the East River is 

 not clear ; and those best qualified to speak with authority on the 

 subject, tell me that careful search on the line marked by Sir W. 

 Logan has failed to show trace of its passage. On the east side of 

 the River the effects it is said to produce, are not such as to show 

 with certaintv that its influence on the configuration of the Coal 

 field is at all equal to that claimed in the report of the Geological 

 Survey. In this paper the fault is retained in all its supposed 

 intensity to show that even under unfavourable circumstances the 

 district to be considered is of great value ; the conclusions to be 

 drawn when it is, in my opinion, more justly considered as not 

 present in serious moment, will be given further on. Between 

 these faults no measures of an age older than the productive are 

 known to exist, and the coal strata are with every appearance of 

 reason considered to run across this interval without undergoing 

 disturbance. 



The western boundary fault has cut off the southern extension 

 of the Westville seams, broken from their continuity with the Albion 

 seams by the fault at McCullock's Brook, which produces a down- 

 throw to the west. This fault has course N. 22° W., and inter- 

 cepts the Main seam a short distance to the west of McCullock's 

 Brook. On the down-throw side of the fault going south, the 

 northerly dip at first is not changed, but on the south line of the 

 Acadia area the measures become flat, then dip south, then flatten 

 again, and finally assume a northerly dip as the workings of the 





