Plum Point Interstadial deposits in Scarborough Bluffs, Toronto, include a layer of unvarved sandy sediments, which indicates relative low lake level, with the ice margin some distance away, probably north of the Ontario basin proper. Radiocarbon dates above and below this layer suggest an age of the most temperate part of the Plum Point Interstadial of 32 000 – 28 300 B.P. i.e. exactly the same age as for the Denekamp Interstadial in Europe. The Plum Point Interstadial in a broad sense can be subdivided, climatically, into three units.

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