260 SURFACE GEOLOGY. 
contributions from the mountains. It suggests the probability of the 
transportation of those at Manchester and Nashua by the local Merri- 
mack glacier. The ice from the White Mountains would meet the tribu- 
tary glaciers from the west, and be compelled to slide upon the east side 
of the valley exclusively. Hence, whatever boulders came from the 
White Mountains would be found upon the East Concord or Manchester 
side of the valley. 
As the continental glacial sheet moved to the south-east, it follows 
that whatever White Mountain blocks are found in the lower till of the 
Merrimack basin must have been transported by a valley movement, un- 
less the natural radial divergence from the mountains could have spread 
as far west as Manchester. 
HANOVER AND VICINITY. 
Passing over to the Connecticut valley, boulders of a different class 
present themselves to view, or those derived from Vermont. We also 
find a large proportion of them brought by the south-east current, 
although the strize close by run west of south. This confirms our pre- 
vious suggestions of the existence of both movements in this valley. 
About two miles north of Dartmouth college the kame furnishes the 
following pebbles, the largest 10 inches in diameter: Barre granite, 
Bethlehem gneiss—both varieties, Huronian diorite, quartz schists with 
decayed layers, calciferous mica schist—several varieties, clay slates, 
hornblende schist, jaspery quartz, quartzite, decayed limestone. Else- 
where this ridge furnishes handsome pieces of red jasper, thought to 
have been derived from ledges west of the Green Mountains, a distance 
of 70 miles. The Barre granite has been carried 32 miles. The Bethle- 
hem gneisses are in place one mile east of this kame for four miles, but 
they more probably came from Haverhill, 40 miles distant, unless trans- 
ported down from the Jacob’s brook glacier in Orford, on the east side of 
the valley. These pieces travelled on the Connecticut glacier. The 
various Huronian and the calciferous schists, and the slates, mostly came 
from the north-west, involving from a few rods to several miles of car- 
riage. 
Further east are heavy deposits of till composed of long travelled and 
much glaciated stones. Three of them are represented in the accompa” 
