What evidence supports the conclusion that there were several glacial advances during this Ice Age?

Question

What evidence supports the conclusion that there were several glacial advances during this Ice Age?

Answer 1

The Great lakes were carved out by these glaciers, but global warming melted them.

Answer 2

Ice core samples for one, which can provide a relatively accurate portrayal of past climates, as well as sedimentation samples.

Furthermore, landscape can be studied (eg mountains or lack therefore created by the advance and receding of glaciers and oceans)

Finally, fossils give us an idea of the life that lived in an area during a certain period and can help us to determine when glaciers existed in specific areas.