IIo SURFACE GEOLOGY. 
in height and a fourth to a half mile wide. The old muster-ground of 
“Cork plain,” in Deering, is a part of this long terrace. On the west 
side the river has a similar but narrower alluvial margin, principally of 
meadow or interval, not exceeding 10 to 15 feet in height. At the north 
line of Antrim and Deering these deposits have their widest development 
upon both sides, covering a mile square. se 
Kames extend along the east side of this low alluvium from opposite 
South Antrim to the north line of Bennington. They are disposed in 
numerous mounds and ridges, which lie mostly north and south, attain- 
ing a height of 100 feet above the river, and occupying a third of a mile 
in width. Their material is sandy gravel, with the largest pebbles about 
one foot in diameter, but they contain, also, occasional angular boulders 
of sizes up to five or six feet. Near their north end the surface of ordi- 
nary till between these gravel ridges is strewn with massive boulders 
often ten feet in diameter. Kames are also found a half mile south-east 
from Hillsborough Bridge, in mounds 10 to 30 feet high. 
A very remarkable accumulation of sand and gravel is found on the 
east side of this valley in Deering, two and a half miles south from Hills- 
borough Bridge, at a height of more than 300 feet above the river. On 
its north-west side an abrupt spur of Hedgehog hill, probably 450 feet 
above the river, projects half-way across the valley; and the same range 
rises still higher on the south-east. The deposit lies upon the south- 
west slope of the intervening hollow, reaching to the height of land 
which separates the hills. It consists of sharp-grained sand, interstrati- 
fied with gravel, which contains pebbles up to six inches or nearly one 
foot in diameter. Four or five acres at the top are nearly level, and 
thence a long slope extends down nearly to the alluvial plain. The 
stratification of this sand and gravel is seen in gullies formed by rains 
or very small springs, which are making slow inroads upon the level 
area at the top, where the undisturbed strata are exposed, dipping to 
the south-west nearly at the same angle with the slope of the hill. No 
boulders were observed, either embedded or on the surface. This is the 
only high deposit of modified drift close to the river in this portion of its 
valley, and must be of different origin from our ordinary high terraces 
and plains; nor does any water-course exist by which it could be brought 
here. 
