272 SURFACE GEOLOGY. 
the quartzites a less distance. The origin of the Bethlehem gneiss is 
not clear ;—if from west of north, it may have come from the north part 
of Haverhill, very near. If the current west of south brought any ma- 
terial to the summit, the boulders would naturally have come from Beth- 
lehem, less than twenty miles away. Upon Mt. Lafayette are many 
boulders of the darker variety of Bethlehem gneiss, derivable either from 
the east or west of north. A fine-grained granite, Huronian hornblende, 
and gneiss occur about fifty rods below the top. Forty feet below the 
top, on the south side, is a boulder of porphyritic gneiss. None of them 
are necessarily great travellers, say twelve or fifteen miles from the 
north or north-west. The Sugar Hill staurolite is found at the Eagle 
lakes, indicating six miles travel to the south-east. This is different 
from the strize on the mountain, which runs west of south. Both forces 
must have operated here. At the first tank on the Mt. Washington Rail- 
way, say 3,000 feet altitude, are stones of Essex county, Vt., pargasite 
and delicate staurolite; at least, no other localities of these minerals are 
known, a distance of twenty-eight miles north-west. At the third tank, 
5,800 feet, are pebbles of Lancaster or Huronian rocks, that have come 
nearly twenty miles. Near the top of Mt. Madison are handsome gran- 
ite boulders, of such material as occurs a few miles northerly. On Red 
hill, Moultonborough, are fine-grained granite, probably from Waterville, 
black mica schist like that of the Cods group, trap, hornblende, Montal- 
ban and Lake gneisses, all in place near by, except the second, which is 
unknown short of forty-five miles to the north-west. Mt. Mote shows 
slate from the upper Saco valley. From Mt. Chocorua I obtained a spark- 
ling mica schist, which may have come either from the north-west or 
the north-east. Lovell’s mountain in Washington shows mica schist and 
gneiss boulders, which cannot be definitely located. On top of Mt. Ascut- 
ney are argillaceous schist and Huronian diorite pebbles, the first from 
the north, the second probably, not necessarily, from the same quarter. 
On the top of the north Twin mountain are boulders of Bethlehem 
gneiss from the north-west, ten to fifteen miles. The slide on the north 
side has many Huronian fragments, that have come about twenty miles. 
Cherry mountain summit shows Bethlehem gneisses from Jefferson, the 
next town. There are boulders of porphyritic gneiss on top of Mt. 
Gunstock. 
