As I read this post I started to think about earlier posts on the Carolina Bays. My theory on them was that huge blocks of ice had been thrown that far from the boloid strikes in Lake Michigan and then melted. I think that the researchers in this article should consider the possibilit of boloid strikes in Lake Michigan causing their phenomena. I tried to find some pictures that might be similar to the Carolina Bays. Instead I found this link. If you look at the topographic map (third one down), it looks to me as if a great quantity of water was sloshed out of the southern tip of Lake Michigan, leaving a ridge of elevated land as the waters receded. Time to post the Firestone book again.
http://il.water.usgs.gov/nawqa/uirb/description/geology.html
Good idea:
The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization
by Richard Firestone,
Allen West, and
Simon Warwick-Smith
Mmmmmaybe on the splash, but OTOH, the muck farms west and south of here were formerly lakebeds, and the Kalamazoo River, which flows into the Lake at Saugatuck, carried glacial meltwater along the base of the icepack, draining the entire area now drained by the Grand River as well as the K-zoo basin. The river that now flows east and through Chicago (apart from the very end, because Chicago built a sewage treatment system that swallows the outflow of the river and makes the Lake flow inward, up the riverbed, as well) used to flow west and into the glacial-era Mississippi.
