North of Evanston and Michigan City, Indiana, the beach has been eroded by later ice movement or shoreline wave action.
From Holland it seems likely to have continued northward to the Grand River, but as that region is extensively covered with sand blown from the modern shore the beach is largely concealed.
In this respect it contrasts with the Calumet and Glenwood beaches, from which molluscan remains have as yet been reported at but one locality, near Bowmanville, north of Chicago.
The Chicago outlet seems to have ceased to be functional at the time they were developed, for they in a measure choke up or bridge over its head.
These ridges are exceptionally well displayed in the south part of Chicago in the vicinity of the university, and they are even better developed just east of the Illinois-Indiana State line.
On a line running north from Gibson station there are by actual count 32 beachlets separated by shallow sags.
[1] Attention has been directed to sand ridges and low dunes that are apparently connected with the Glenwood beach.