The last major one of these "glacial" time periods came during the Pleistocene Epoch
The 
retreat of ice during a glacial epoch is called an inter-glacial period and this is our 
... During the last 3 million years glaciers have at one time or another covered 
about... [DOC] [TLE] Discovery of the Ice Age - Earthguide - University of California, San ... [PAR] One of the more intriguing ideas came from the Scotsman James Croll, who ... in 
the field for many