16 T. Mellard Reade—The Eskdale Drift— 
It is very instructive to contrast the effect of glaciation on the 
fine-grained rocks of the Volcanic series, which are found among 
the granite boulders with the granite. These stones are often flat, 
also due to a prevalent system of joints, and these plane surfaces 
have been polished smooth and covered with fine striz. 
The shape of the stone as well as its nature evidently influences 
the mode of glaciation. Some irregularly shaped stones are covered 
with the most extraordinarily confused intersecting scratches. That \ 
the granite boulders have been brought down the valleys by glacial 
ice notwithstanding the facts stated admits of no doubt; but in 
what way they have been dispersed south, west, east, and even north 
in view of the ideas put forth by the new school of glacialists is a 
question worth examining. In the accompanying Map, Fig. 2, the 
distribution of these erratics is roughly shown, the dotted lines 
exhibiting the direct course from the point of origin, not the actual 
course travelled, which cannot be known. 
hy 
Macclesfield 
U 
Y] 
,_ Moel 
® ryfaen 
NORTH WALES 
Llangollen 
1 
Gloppa 
Oswestry * 
SCALE OF MILES 
10 
20 
Typo.Etching Co.So. 
T. Mellard Reade, del. 
Fie. I].—Map showing dispersion of Eskdale Granite. 
———e a 
