Cold stage type sections. Some thoughts on a difficult problem

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Abstract
It is important to apply formal chronostratigraphical and lithostratigraphical procedures to the subdivision of Pleistocene sediment sequences and especially to define both regional and local stratotypes. There are particular problems related to the definition of cold stage stratotypes in areas that have been subjected to glaciation. However, many of the widely-used terms applied to Pleistocene cold stages in Europe, notably Weichselian, Saalian, Elsterian, Riss, Mindel and Gunz, still possess no formally defined stratotypes. Problems regarding nomenclature and correlation of Pleistocene sequences, largely arising from non-definition or unsatisfactory definition of stratotypes, are illustrated with reference to the Saalian of northern Continental Europe and the Wolstonian of Britain. Recommendations are presented to encourage and improve the selection and definition of cold stage stratotypes. A boundary stratotype for the British Wolstonian Stage is defined in an appendix.

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