destroyed stratification =, -so that it: is. virtually impos= 
sible -to distinguish 1 from the sandy. till of the mo- 
Yainee Even the - pre oz is blocks or boulders in a devosit- 
does rot fuarantee thal area is till because’ such erratics 
could easily have tecorme ioc outvash gravel from nearby ice. 
The southern margin e moraine is, therefore, prov- 
ably much more irrezguler -tsan een indicated on the map. To 
pilot it in detail. would require igzging --of many long trenches, 
and this would be. a rar more c operation than is warranted ty 
the purposes. of the, presexs.-investizatione 
An uneven and indistinct boundary -like the-one - just described 
s found at some pleces alons the marzirs-of present-day glaciers in 
i =) liat 
aS TOSS a rarrow zone for a time, building 
moraire in frort of which en cutwash plain develops simultaneouslye 
p> ps 
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a 
During construction of tre deposits at such places, masses of stag- 
nant ice, either isolated ?rom the main mass or protruding beyond it 
in irregular tongues, are curied by -outwash:or by tille Sand and 
gravel washed out of active ice accumulate in places on top of the 
till laid by stagramt ice and then covered with more till when 
tke ice readvances ‘ ritory.  Consequertly, a complex 
nterfingering of gla cio-fluvial materials -is produced. 
lly the outwash pl 15 up so high that its:materials are 
osited in--places within the morainic:area - and. fill some of the 
lows. Melting of ice ther causes so- much slumping in 
zone of coxntact moraine and the outwash plain that 
ations of the deposits tecome still more complex and confus- 
+ 
nd any ridge-lize tiox that may once have existed along 
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ch be ck ck fo’ G tay 
raphy in the zone tetreen:the main body of.the Ellis- 
in which till. is exposed and parts of the - Wareham 
3 s gravel may be observed is eSsen- 
° he conditions outlined above. It 
fo) thet this moraine and its - bordering outwash 
Similtarezousiy in a similar manner. - The moraine 
de 50 2 rgirs of a pitted plain ty readvance 
y and Sandwich moraines, but was corn= 
ortimious tortimvard retreat of the ice front was 
erable interval during which its. edge: fluctuated 
rea now coverea by the morainic deposits. : 
S. norther= side; abous half a-mile southyest of Briggs 
aac 
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Std ow 
Ph OW ys 
, yp 
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5 
a) 
Reservoir, the Ellisvitis moraine --has a: rather. prominent, steep, 
Louldery margin, which -can te traced easily as a continuous blurt 
Tor more than a mile. Sass of this a similar area of higher ground 
(which may or may not te moraine) covered with boulders 
curves nortneastware ard 20 Hall and, “the bills northeast 
of it through Vallersvilles bet the tiuff that forms their northern 
da s not c » or straicht.as the one de- 
Ge t e smoother topography of Hio 
rewhat different from that of 
has not yet beer thoroughly 
min a zone of irregular topog-~ 
