 The same occurrence of three beaches was noted in the Saginaw basin between Flushing and Cass City, but west of Flushing only two beaches appear.In the Saginaw basin the Arkona beaches were not submerged, but they were uplifted.The full strength of the Arkona beach ridges near Cass City and Croswell makes it clear that the ice barrier stood at least 25 miles north, enough distance to allow a heavy on shore surf.