The area encompassed by the State of Indiana has several series of glacial terminal moraines. These are the piles of debris left at the edge of a retreating glacier.
The Indiana Moraines reflect SEVERAL of the ancient glaciations and extend from about Indianapolis all the way to Louisville.
There's also a highlands area in the middle that tends to confound everyone's thoughts about the glaciers.
One of the things we don't know much about yet are the various interstadials that occur in the midst of a glaciation. These are warming periods that last less than 10,000 years and are not as widespread as the interglacials that last at least 10,000 years.
It is possible that due to a slight uptick in the GW process about 3,000 BC we now have an interglacial that's latched onto an early interstadial. Because of that it is entirely possible the next glaciation could start tomorrow ~ which is just 1 hour and 42 minutes away.
Well, if the glaciers were well covering northern states, they couldn’t have been used for farming very well. That wasn’t that long ago in geological terms. The weather couldn’t have been too great in southern states either.
So far, warming temperatures are an improvement. It also tends to imply that the weather now is “normal” and that anything else isn’t. Pretty tall order.