GLACIAL DRIFT. 279 
museum. About two miles north of Norwich village, Vt., on the road to 
Copperas hill, is a hill thirty feet high, of lower till with innumerable 
glaciated stones cemented by boulder clay. One of a micaceous argillite 
may weigh 1500 pounds, perhaps five feet in length, of the typical trap- 
ezoidal shape, except it is narrower than usual. The longer axis points a 
little east of south, as the stone lies in the bank. The under surface and 
the sides are striated parallel to the longer axis, but the upper surface 
bears very plain marks at right angles to those beneath. I was able to 
preserve only a piece of this boulder, showing the upper surface and the 
beginning of the lower striz at right angles to them. The boulder 
proved larger than was expected, so that I could not transport it entire 
to Culver Hall. 
A common variation in shape is the elongated narrow one, a prolate 
spheroid. Geikie, in his work on the Great Ice Age, figures four striated 
stones from Scotland, three of which clearly possess the typical shape I 
have mentioned, while the fourth is blunt at one end and pointed at the 
other,—a form also seen with us. These stones show the same features 
the world over. Argillaceous boulders best preserve the glaciation. 
SurFracE Deposits AT PorRTLAND, ME. 
The relations of the two varieties of till to the Champlain gravels are 
not exhibited in any outcrops yet discovered in New Hampshire. A 
familiarity of long standing with the fossiliferous clays and the drift of 
Fig. 59.—SECTION IN TILL, PORTLAND. 
a. Upper till; b. Fossiliferous Champlain beds; c. Lower till. 
Portland, Me., led me to think the question of relative position well 
shown there; and upon examination I discovered that the fossiliferous 
beds occupied a place midway between the two kinds of till. Numerous 
excavations have made the sections in the till and sands perfectly satis- 
