230 Transactions of the Academy of Science of St. Louis 
TABLE VIII. 
Classification of the Pleistocene Period according to Kay and Leighton.* 
PERIOD EPOCH AGE 
(System) (Series) (Stage) (Sub-stage) 
PLEISTOCENE / Recent 
Eldoran 
Mankato, glacial 
Wisconsin ee glacial 
ee glacial 
lowan, glacial 
\ Sangamon inter- glacial 
Centralian 
} Illinoian, glacial 
Yarmouth, inter-glacial 
Ottumwan 
Kansan, glacial 
Afton, inter- glacial 
Grandian 
Nebraskan, glacial 
*Kay, George F., Classification and duration of the Pleistocene period: Geol. 
Soc. America Bull., vol. 42, p. 449, 1931. 
Kay orge F., and Leigh rris M., Eldoran epoch of the Pleistocene 
peeled Geol. Soc. yh eect Ban vel 44, p. 673, 1933. 
