396 WARREN UPHAM, ESQ., M.A., F.G.S.A., ON 
successive stages and formations of the Ice age was by 
Chamberlin in his two chapters zontributed to the third 
edition of Geikie’s Great Ice Age, mm 1894, naming the 
Kansan, East Iowan, and East Wisconsin formations. For 
the second and third he afterwards adopted the shorter 
names, Iowan and Wisconsin. Chamberlin correlates, with 
a good degree of confidence, his Kansan stage of maximum 
North American glaciation with the maximum in Europe, 
which is Geikie’s Saxonian epoch; the Iowan as the 
European Polandian; and the Wisconsin or moraine-forming 
stage of the United States as the Mecklenburgian, which was. 
the stage of the “ great Baltic glacier” and its similarly well 
developed moraines.* According to the law of priority, the 
names of the Kansan, Iowan, and Wisconsin formations and 
stages should also be applied to these European divisions of 
the Glacial series, for the studies of Geikie and Chamberlin 
show them to be in all probability correlative and con- 
temporaneous. 
Differing much from the opinions of Geikie, and less: 
widely from those of Chamberlin, concerning the import- 
ance, magnitude, and duration of the interglacial stages, 
but agreeing with Dana, Hitchcock, Kendall, Falsan, Holst, 
Nikitin, and others, in regarding the Ice age as continuous, 
with fluctuations but not complete departure of the ice- 
sheets, my view of the history of the Glacial period,. 
comprising the Glacial epoch of ice accumulation and the 
Champlain epoch of ice departure, may be concisely presented 
in the following somewhat tabular form. The order is that 
of the advancing sequence in time, opposite to the downward: 
stratigraphic order of the glacial, fluvial, lacustrme, and. 
marine deposits. It should be added that this tabulation, 
so far as it pertains to North America, is supplied mainly 
from the field work and correlations of Professor T. C. 
Chamberlin, in charge of the Glacial Division of the United 
States Geological Survey, of his assistant, Mr. Frank Leverett, 
of Professor Samuel Calvin, state geologist of Iowa, and of 
Dr. George M. Dawson, director of the Geological Survey of 
Canada. Their special studies and conclusions have been 
published at various times during the past five years, mostly 
in the Journal of Geology and the American Geologist. 
* Journal of Geology, vol. iii, pp. 270-277, April-May, 1895. 
