The earliest inter-Glacial period known in Canada is that of the Toronto formation, which has been described more than once, and is somewhat well known to Pleistocene geologists. Excavations near Toronto and elsewhere provide fresh information in regard to it from time to time and give emphasis to the conclusions already reached as to its length and the character of its climate, and special studies of the general relationships have been made by the writer in connection with the recent visit to Toronto of the Geological Congress. As there are still some prominent Pleistocene geologists who refuse to admit an inter-Glacial interval of great length and of mild climate, it is proposed to bring together here the latest evidence of the reality and importance of this inter-Glacial period.

At Toronto five well defined sheets of boulder-clay are known, with four sheets of interglacial stratified sand and clay separating them. . . .

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