Dating quaternary sediments

The current extent of Hudson Bay, the Great Lakes and other major lakes of North America are a consequence of the Canadian Shield's readjustment since the last ice age; different shorelines have existed over the course of Quaternary time.The climate was one of periodic glaciations with continental glaciers moving as far from the poles as 40 degrees latitude.The Quaternary subdivisions were defined based on biostratigraphy instead of paleoclimate.This led to the problem that the proposed base of the Pleistocene was at 1.805 Mya, long after the start of the major glaciations of the northern hemisphere.

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These mammals became extinct when the glacial period Age ended about 11,700 years ago. During the Quaternary Period, mammals, flowering plants, and insects dominated the land.

There was a major extinction of large mammals in Northern areas at the end of the Pleistocene Epoch.

Many forms such as saber-toothed cats, mammoths, mastodons, glyptodonts, etc., became extinct worldwide.

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