Wolstonian glaciation
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The Wolstonian glaciation, or Illinois glaciation, was an ice age period which occurred between 200,000 and 125,000 years ago. The first name is used by British geologists and archaeologists who named it after the site of Wolston in the English county of Warwickshire where deposits of this stage were first identified; the second refers to the glaciation present in what is now the Midwestern United States. The glaciations occurred during the Pleistocene stage of the Quaternary period.
The Wolstonian glaciation and Illinoian glaciations are temporally analogous to the Warthe and Saalian glaciations in northern Europe and the Riss glaciation in the Alps. It was the penultimate glacial phase of the Pleistocene. Its deposits have been found overlying material from the preceding Hoxnian interglacial and lying beneath those from the following Ipswichian interglacial periods. Acheulian flint tools have been found in Wolstonian deposits.
