MIDWESTERN U.S.A. GLACIAL CHRONOLOGY

UNIT TYPE LOCALITY NAMED BY REFERENCES
WISCONSIN State T.C. Chamberlin J.Geikie, 1894; Chamberlin, 1895
SANGEMON Sangamon Co., Ill. F. Leverett Worthen, 1873; Leverett, 1898
ILLINOIAN State F. Leverett Chamberlin, 1896
YARMOUTH Yarmouth, Iowa F. Leverett Leverett, 1898
KANSAN State T.C. Chamberlin J.Geikie, 1894; Chamberlin, 1895, 1896
AFTONIAN Afton Junction, Iowa T.C. Chamberlin Chamberlin, 1895; Bain, 1898
NEBRASKAN State B. Shimek Shimek, 1909

"Never Kiss In Winter -- After You've Sneezed"

      Bain, 1898. Iowa Acad. Sci. Proc. 5: 93-98.
      Chamberlin, T.C. 1895. Journal of Geology 3: 270-277.
      Chamberlin, T.C. 1896. Journal of Geology 4: 872, 874.
      Geikie, J. 1894. The great ice age and its relation to the antiquity of man. (1st) W.Ibister, London.
      Leverett, F. 1898. Journal of Geology 6: 176, 239.
      Shimek, 1909. Afton sands and gravels in western Iowa. Geol. Soc. Amer. Bull. 20: 408.
      Worthen, 1873. Geology of Sangamon County. Illinois Geol. Surv. 5: 306-319.
After Flint, 1971, table 21-b