Illinoian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quarternary
 ....Pleistocene
 .....Upper Pleistocene
 ......Illinoian
UFIllinoisan
RTElsterian
 Glasford Formation
SNPertaining to third glacial stage of Pleistocene Epoch in North America.