1921] DACHNOWSKI—PEAT DEPOSITS 85 
stages to the present are critically important, for they bear radically 
on interpretations that have already been well supported in the 
countries of northern Europe. 
It does not lie within the sphere of this paper to review the 
literature dealing with the probable causes which produced the 
glacial period or its climatic changes. These and other considera- 
tions are discussed fully by CLEMENTS (3), Douctass (9), HUNTING- 
TON (11), and others. 
The only question is - vA AA DA 
how far the types | 
of peat material and A Deciduous 
their sequence in In IA ba gpd egg 
peat deposits may rack stumps 
furnish evidence of & A A 
climatic effects = aes 
during the succes- 3 carex peat 
sively less extensive © a 
positions of the ice = ast 
border. The facts 6 SSS SSS SSS ee 
given in this article ea | Marly phase 
xen iG. 
seem to indicate at ?@):| Marly sand 
#1 9 
least three if not Be 
four major oscilla- Fic. 12.—Profile section showing sequence of strata 
tions during which in peat deposit near Mantua, Portage County, Ohio; 
elevation 1155 feet a.t.; sounding on lot no. 9, west 
the climate fluctu- 
ated between warm 
and cold conditions, between periods of greater dryness and greater 
humidity. 
Summarizing the climatic changes since the disappearance of 
the Wisconsin ice sheet in Ohio, the following may be stated ten- 
tatively: In the record of a few Ohio peat deposits an irregular 
Series of changes can be traced, due to effects of climatic influences. 
Apparently twice a comparatively dry and cool period alternated 
with a relatively warm and humid period. After glaciation 
had reached its maximum extension, there followed two minor 
periods of recession of the ice field, a time during which a cool and 
dry climate bordered closely the glacial regions in this locality. 
side of Center pad as indicated on map (fig. 11). 
