EFFECTS OF ICE AGE ON FAUNA 
43 
the drift, are rather problematical. Most, if not all, the occur¬ 
rences of reindeer and musk ox bones lie within the drift area. 
As already mentioned, animal remains have been met with in 
caves and other deposits, close to the limits of the drift, and 
supposed to belong to the Pleistocene Period, which seem to 
indicate a climate somewhat milder than the present one. 
The most noted Pleistocene fossiliferous strata within the 
drift area lie in Canada, and these contain largely the remains 
of plants. Since the first place as tests of climate has gene¬ 
rally been assigned to plants,* their testimony will be of 
particular value in our present enquiries. These deposits have 
been principally studied by Professors Coleman f and Pen- 
hallow.:}: Some are in the neighbourhood of Toronto near the 
shores of Lake Ontario, others further west near the Moose 
and Albany Rivers, both of which empty their waters into 
Hudson Bay. 
In dealing with the beds in the neighbourhood of Toronto, 
Professor Coleman reports that those of Scarboro’ Heights 
contain mosses, diatoms, a few fresh-water shells and a con¬ 
siderable number of elytra of beetles. According to Dr. 
Scudder the latter, numbering twenty-nine species, are all 
extinct, and related to species occurring in Lake Superior and 
Hudson Bay regions, the fauna having a boreal aspect. The 
fossils from the Don River deposits were found to be sur¬ 
prisingly different. They seemed to point to a climate as 
warm as that of Toronto, if not much warmer, while the forest 
trees suggest a temperature far from glacial. Not a trace of 
an arctic fauna or flora could be discovered. It was con¬ 
cluded, therefore, by Professor Coleman that both these series 
of beds were inter-glacial, that is to say, laid down during the 
mild phases which are supposed to have separated the in¬ 
tensely arctic ones from one another. 
The plant remains from the other deposits were like those 
of Scarboro’ Heights and Montreal. They were essentially of 
the same character representing a vegetation similar to that 
of our own time, or perhaps even a little more severe. 
* Seward, A. C., “ Fossil Plants as Tests of Climate,” p. 10. 
t Coleman, A. P., “ Glacial and Inter-glacial Deposits,” pp. 625—640. 
f Penhallow, D. P., “ Pleistocene Flora of Canada,” p. 77. 
