It is now 30 years since Professor N. H. Winchell first discussed the history of Saint Anthony falls and 20 years since his final description of “The Recession of the Falls of Saint Anthony” was published.2
The conclusions which he then reached have stood without revision or notable modification to this time. Both his description of the sharply defined gorge in which the Mississippi river runs from the falls at Minneapolis to near its junction with the Minnesota river and his interpretation of the gorge as the work of the gradually receding waterfall appear to have been generally accepted as final. The Saint Anthony gorge stands therefore today with that of Niagara falls, as one of the great geological timepieces by which the duration of time since the Glacial period may be calculated.
The gradual recession of Saint Anthony falls for the distance of about 8 miles in about . . .