140 MORLEY E. WILSON 
occurring at the north end of Lake Timiskaming. In order to 
make these more nearly comparable, they have been recalculated 
to a total of 100 omitting the water. In Column Va partial analysis 
of argillite from Lily Lake in the Gowganda district, is inserted. 
It will be observed that in both the argillite and the clay there 
is an excess of soda over potash, a relationship which is usually 
reversed in normal sediments of the slate-shale series. ‘The large 
percentage of lime and magnesia in the postglacial lacustrine 
deposits is undoubtedly due to the large amounts of Paleozoic 
limestone which were denuded away by the Pleistocene continental 
ice sheets and were thus transformed into glacial drift and later 
redeposited as stratified clay. 
CONCLUSION 
Having assembled the evidence which might have a bearing on 
the origin of the Cobalt series, the following conclusions may be 
cited with regard to the climatic conditions and depositional 
processes in operation at the time these sediments were laid down: 
(1) that the series is of terrestrial origin; (2) that the basal por- 
tion of the series is in places an ancient regolith; (3) that the 
stratified greywacke, argillite, quartzite, and arkose are lacustrine 
deposits; (4) that aeolian deposits are not represented in the series; 
(5) that the climate of this period was ot arid or semiarid and was 
probably cold and humid. (6) With regard to the mode of depo- 
sition of the major part of the conglomerate only two hypotheses 
need ‘be considered. They are either of fluviatile origin or have 
been deposited from continental ice sheets. From a consideration, 
however, of the difficulties of transportation involved in the flu- 
viatile hypothesis and that the climate and topography of the 
region were wholly the reverse of those under which fluviatile 
deposits of this character are accumulating on the earth today, 
and on the other hand, the facts that practically every feature of 
the Cobalt series has its duplicate in the Pleistocene glacial, inter- 
glacial, or postglacial deposits of North America, that the pebbles 
and -bowlders of the conglomerates have a characteristically “‘soled”’ 
appearance and that striated pebbles and bowlders have been 
found in two localities over 60 miles apart, it seems necessary to 
