interslacial stages, each lasting ten is hundreds of thousands of 
yearse (See Tabl z ca there were at least four 
distinct ¢l  PHPth, each marked by depos- 
its such as iedine paragraphs.» 
The ar ial stage are not identical. 
Ge as! poss fe) iH terminal moraines of each 
stage and. t dep rlier Pleistocene glaciations 
that were not overridden ty later Pleistocene glaciers. Fortunately 
the tills ofearlier stazes were not everywhere plowed up and removed 
during readvance of the ice. ae at some places we can 
find tre sediments of saverei stazes lying one above another, proving 
that these localities were sucjected to repeated glaciation. It 
would not-be easy to distixnzuish the several tills, however, if the 
older ones were not more rotted and stained because they lay exposed 
to weathering for a longer time. Here and there, layers of soil con- 
tefining the-remains of plants that could thrive only in warm weather 
have teen found tetween till layers. This is clear evidence that af- 
ter the ice that laid the lower and, therefore, older material had 
disappeared, vegetation Zlourisned for a while and was then buried 
when glaciation prevailed once more. 
lacial-reaterizls is thinner in the eastern 
2 certral statese Although the thickvess of 
3s zererally only a few feet, in placés it 
of New Eneland over which 
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r-southe Perhaps, therefore, 
he -ctearing ice moving across a 
a thousand years of each glacial stages Pos- 
c influerce oF the reighboring ocean in some way 
thick as it was farther west; as 
tter over the land surfaces 
s is exposed.in the maritime 
rocks had been weathered so 
zl hem during millions of years 
the Ice Agee ane: ol ed from these soils during any 
stage of glaciation cold not, therefore, be uniform in color 
from place to piace + is an uncertain procedure to 
New Englard til early Pleistocene, simply be- 
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ard study as have those in the 
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