When you look at Google Earth (or even Maps) and view the northern portion of Canada, particularly in the east, and down into the Northern tier US states you can see the scouring marks of the glaciers and the till and moraine left behind. Humans lived along the front edge of that zone and I've read about some of the stone tools found. Europe also, I'm sure. But I never thought about the flip side of that, that the southern hemisphere had glaciation over the top. Glaciers over North America didn't go much further south than Michigan, Wisconsin, Washington, Montana, etc.; what would have been the range of the ice sheets in Australia?