How many years ago did the Last Glacial Maximum occur ?
The glaciations that occurred during this glacial period covered many areas of the Northern Hemisphere and have different names , depending on their geographic distributions : " Wisconsin " ( in North America ) , " Devensian " ( in Great Britain ) , " Midlandian " ( in Ireland ) , " Würm " ( in the Alps ) , " Weichsel " ( in northern central Europe ) , and " Llanquihue " in Chile .