32 SURFACE GEOLOGY. 
The village of Haverhill is situated on a high, smoothly rounded, ter- 
race-like area of till. This slopes steeply towards the river, but very 
slightly to the north and north-east, and extends nearly level for half a 
mile south-east to the foot of Catamount hill, and for two miles south- 
ward along the Piermont road. A large proportion of the boulders in 
this till are glaciated, sometimes preserving distinct striz. The prevail- 
ing size is less than three feet; but rocks of five or six feet diameter, or 
even larger, also occur. These are found most rarely over the south part 
of this area in Piermont, where the abundant rounded or glaciated peb- 
bles exposed by the channels of streams present the appearance of coarse 
kame-like gravel. At about one fourth mile south- 
west from Haverhill village a gully recently made on 
E. 
400 ft 
above sea, 
a previously smooth slope, at a height about 175 feet 
above the river, and consequéntly much above its 
highest terrace, and 75 feet below the village, showed 
15 feet of modified drift resting on till. The surface 
was 3 feet of coarse gravel, which was succeeded by 
Length, 1$ miles. 
12 feet of interstratified fine gravel and sand, oblique- 
ly bedded. The stratification here sloped with the 
present surface, about 10 feet in 100, with the ob- 
liquely bedded portions steeper in the same direc- 
tion. Similar sections of overlying modified drift are 
shown in many places west and south from Haver- 
hill, but the north and east parts of this area consist 
only of till This is the ground-moraine of the ice- 
sheet, peculiarly massed here in very large amount, 
Piermont 
depot. 
resembling the massive rounded hills of the same 
material, which are abundant near the coast. On the 
opposite side of the river we find the extensive slope, 
which’ rises south from Hall’s brook, also composed 
of till with no outcropping ledges. 
In Piermont, opposite Bradford village, the modi- 
fied drift is divided by ledgy hills close to the river 
into two belts, the eastern of which has a height of 
478 feet above the sea, or about 90 above the river, where it departs 
from the main valley. This extends along Gully brook, sloping in two 
Fig. 5.—SECTION IN BRADFORD AND PIERMONT. 
Delta of 
Wait’s river. 
