206 
ing agent must have travelled over a limestone country in one 
part of its course. 
The following is a section, in descending order, at Point Mars- 
den, where the Breccia-beds occur, the thickness of these beds 
are reckoned at their maximum. 
Section of Breccia-beds at Point Mursden. 
Overlying sandstone: thickness unknown. 
Ft, in. 
1 ee i oo eae 
09 14ft., hard rock 4 O 
2. aii : Ri 
Sandstone basa 07* 6 
3. Breccia Dd 0 
Flagey sandstone eae 
4. Breccia. Increases rapidly from 1 ft. to ao 
Sandstone in thin flags 1°"G 
5. Breccia ied 
Sandstone 8 0 
6. Breccia BAD 
Sandstone 2S a 
7. Breccia 20 
Thick sandstones. 
At White Point, a distance of rather more than a mile 
from the above section, another Breccia (No. 8) occurs. 
. Breccia et eit sie aoe 
Thick somdtawee and ehalles. 
The total thickness of these Breccia-beds is about 30 feet- 
They are very sharply defined in their stratigraphical junction 
with the overlying and underlying beds. There is no commingling 
of material, except an occasional erratic enclosed in the stratified 
sandstone, generally within a few feet of the Breccia-beds. 
The origin of these remarkable beds is difficult to determine. 
Although no indication of glaciation could be detected on the in- 
cluded fragments, it is difficult to refer these confused assemblages 
of rock fragments to any other agent than ice. The evidences 
which favour this conclusion are (1) The beds are unstratified ; 
(2) the fragments are angular ; (3) the lithological characteristics 
of the rocks are extremely varied ; (4) the isolated erratics which 
occur in the sandstone may also be best explained by such a 
supposition. It may be that these Breccia-beds represent a ter 
minal moraine with the foot of the glacier alternately advancing 
and retreating, which would account for these Breccias being 
irregularly interstratified with the sandstone layers. On the 
other hand it is remarkable that the included fragments are so 
limited in size. This feature might point to the agency of shore. 
io) 
