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A substantial Sangamon interglacial (isotope stage 5) and subsequent Wisconsin glacial sedimentary record is preserved at Toronto, Canada. The age of individual stratigraphic units is poorly constrained, however. An interglacial sequence records climatic deterioration from warm temperate to subarctic. The interglacial Don Beds, resting on a presumed Illinoian till, were deposited on a storm-influenced shoreface of an ancestral Lake Ontario in water depths that increased over the recorded time interval from about 2 to 20 m. Pollen and faunal analyses identify a climatic deterioration in the upper Don from warm-temperate conditions, with mean annual temperatures some 2 °C warmer than...

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