Reproduced from U.S.G.S "Glacial map of the U.S. east
of the Rockies, 1959, west half"
Reproduced from U.S.G.S "Glacial map of the U.S. east
of the Rockies, 1959, west half"
| Light blue= lacustrine sediments
Green = end morains Black lines in the morains = crests ridges of morains Yellow= out wash sediments Red dashed line = limit of last glaciation |