Lake Chicago  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quarternary
 ....Pleistocene
 .....Lake Chicago
RTUnited States
 Illinois
 Indiana
 Wisconsin
 Michigan
 Great Lakes region
SNPleistocene glacial lake in the Great Lakes region. Indexed with states as applicable. Added to Thesaurus in 1989.