SURFACE GEOLOGY, PICTOU COAL FIELD—POOLE 393 
turbed strata, and if it be rightly inferred that in the shattered 
rocks of dislocations suberial agencies would exert most influ- 
ence, the association of the two is readily explained. 
On the other hand, if it is assumed that the inequalities of the 
surface have been formed by the action of ice and marine cur- 
rents, the reasoning applied to the clay ridges should be applica- 
ble to the hills and hollows, and approximate form and direction 
in rocks of uniform texture might fairly be expected. 
This is not seen in the pre-glacial surfaces, which have been 
protected from subsequent erosion by the covering of drift. 
But the faults that have circumscribed the basin and severed 
it into sections would rather appear to have been the primary 
eause for the hills and hollows assuming their present form under 
the hand of agents conveniently classed as suberial, acting 
through the ages that have been since the time when elevating 
and lateral pressures broke the uniformity of the carboniferous 
strata. 
To clearly show this would require the field to be carefully 
mapped and contoured, which, unfortunately, has not yet been 
done. Such a map would further shew that the highest beds in the 
Marsh pit series, in fact the highest in the coal measure, is at the 
lowest elevation above the sea in the eastern section of the basin, 
and is overlaid by a small pond in shape of an arrow-head, whose 
edges are parallel to the strike of the strata on two sides of a 
subordinate fold. 
