PS. Wikipedia calls them "icefalls"The rock derives its name from a story of Illiniwek history. A band of Illiniwek was reportedly trapped in the 1760s on the rock by a band of Potawatomi trying to avenge the death of the Ottawa Chief Pontiac. The Illiniwek scrambled to the top of the rock, where the Ottawa and allied Potawatomi laid siege until their enemies had starved to death.
Coal said:Yes, that's the story that was told to us by our scout master, (many years ago of course.)