SB 
the rock types represented among 200 pebbles of such sizes collected 
at random at each of -six localities in the Sandwich moraine shovysg 
different percentages of the types that are common’ to both moraines, 
For example, on-the average only 45:.per cent of the small:stones ir 
the Sandwich moraine’ are’ granite’ and the maximum for these collec-.- 
tions is 57 per cent, whereas in the Buzzards Ray moraine the aver- 
age is 66 per cent, and the minimum is 58 per cent.. Basalt pebbles’ 
make up nearly 10 per cent of the-smaller stones in the Sandwich*mo«+ 
reine but only’ 3 per cent ~ of those in the Buzzards Bay moraine. 
Other volcanic pebbles average 13 per cent in the Sandwich:moraine 
atid only 4 pér’ cent in the Buzzards Bay moraine. Of course, the peb- 
ble contert of any moraine changes from mile to mile of its length, 
but heré the difference in rock content can be traced to within a 
mile or even a few hundred feet ee the place where the two moraines 
joine 
The south face of the Sandwich moraine overlooks the as 
plain along a sharp boundary that is easy to follow. South of Tele- 
graph Hill and along Popple Bottom Road this frort appears ‘from the 
south like’a high ridge strewn with scattered erratics. «It is, how- 
ever, complic&ted just north -of Cape’:Cod Airport in the southeast 
part of the Sandwich quadrangle by subsidiary short ridges, as ex- 
plained on page.25,..of bedded gravel which extend obliquely out; into 
the main pitted plaine These were probably formed near acne ice edze 
prior to the deposition of the main moraine. 
Although gravel pits and ‘deep roadcuts are not so numerous in 
the Sandwich moraine as in the Buzzards Bay moraine, there is «some 
evidence that both'are essentially veneers of till, 5-to 30 feet.oor 
more ‘itt thickness, resting on aisturiod olde rast luvial sand and grav—- — 
el. Roadcuts near the north edge of the moraine, on Quaker Meeting- 
house Road and on Chase Road, reveal saridy till on tedded sande The 
large kettle-hole traversed by Forestdale Road 0.7 mile southwest of 
Telegraph Hill in Sandwich and extending from the pitted plain into 
the moraine is analogous to similar kettle-holes along the front of 
the Buzzards Ray moraine ‘and had a similar origin. A large mass of 
stazrant ice buried in the gravel of the plain did not melt until 
after the moraine had been deposited upon the north margin of the 
plain, following a readvance of the ice from the position in which 
it stood when the plair was under construction. easy 
= The northern part of the Sandwich moraine is 4 very irregular,’ 
commonly sandy, deposit at low altitude like that on the west side 
of the Buzzards Bay~morainee There is, however, a marked topographic 
break along the north boundary of the Sandwich moraine, even more 
corspicuous and continuous than that along the west side of the Buz- 
zards Bay moraines North of the Sandwich moraine lie areas covered 
with salt marsh, low sand plains, and a few distinct and entirely 
separate hills of the Scorton morainee' 
frea of Overlap on Buzzards Bay Moraine 
Time relations between the deposition of the Sandwich moraine 
and thet of the Buzzards Bay moraine have been inferred from studies 
