ae he } 
easvern 1am1 
were wmcovere 
Other complications in the glecial =z 
are attributable to its hilly topograpry. 
during ice recessions earlier than were 6 
Tong, narrow masses of ice stood stagnent in 
separated from the receding margin o- 
shrank, their meltwaters were ponded 4 
walls. lakebed sands and silts which 
these temporary basins conceal whatever 
fluvial materials may have been spread 
turies of ice recession, New England mu 
till-veneered or barren hills alternsting with stagnant ice massc 
and dotted with ephemeral lakes. 
mu 
Change of Sealevel 
A significant fact to keep in mind concerning the Ice Age is 
that. the sealevel of the whole world stcod i150 to more than 200 feet 
lower than it does today. The glaciers were fed by snow that could 
only have come originally from evaporation of seawater. As the ice 
increased in thiclmess, the sealevel went i oh hore 
"i 
line migrated out from its previous position 
the interglacial stages enormous volwnes cf 
their waters to the ocean; the sealevel ro 
back over the continental margins, Sane 
the New Englend strandline may have mov 
of the present shore during the stages of 
ed 
$a 
