upper Weichselian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quarternary
 ....Pleistocene
 .....Upper Pleistocene
 ......Weichselian
 .......upper Weichselian
NTAllerod
 Older Dryas
 Younger Dryas
SNW Europe. Added to Thesaurus in 1989.