—_ nae eee pe a enh eS ae eee SEAL eee ep ae 
: ese pre ee ey SSE RR ere) es, id 
Icy Plateau, the source of the New England Glacier, 325 
on the higher summits of New England, must point approx- 
imately toward the region of elevated land, or the great Icy 
Plateau, as we may call it, on whose slopes the movement of 
the glacier originated. 
This seat of power in the era of ice was not the Adiron- 
N 
America, and even a map of the World) much too far to the 
south. The scratches point over Lake Champlain and the low 
hills and plains beyond, and across the St. Lawrence. On the 
other side of this river lies the large valley of the Ottawa, and it 
is almost exactly in their direction ; and the prevailing trend of 
the scratches through its lower half is about 8.45° E. Accord- 
ing to the table in Logan’s Report for 1863 (p. 890), this is the 
course at Ottawa City, Hull, Rideau River at Stegman’s Rapids, 
and Horton near Renfrew village south of the Ottawa. At 
Allumettes Lake, the course S. 25° E. was found; but this 
locality is higher up the stream, and the course may well have 
to some local influence. There can be no doubt 
that, if the Glacial era was a glacier era, the Ottawa valley ice 
Was a part of the same great ice-stream with that which crossed 
the Green Mountains, but a portion nearer the source. 
The Ottawa valley, including that of Montreal River (which 
has the course of the Ottawa and is its western head-tributary), 
extends toa point nearly 500 miles in an air-line from Mt. 
Mansfield, and 570 from the White Mountains, with an average 
trend of S. 65° E. But the source of Montreal River was not 
scratches in the Ottawa, instead of a si with the 
: e 
Bay . The scratches of the White Mountains and Green Moun- 
tains and those of the lower part of the Ottawa valley point 
alike toward this area. : 
.. It follows that the Icy Plateau, whence the great glacier took 
its departure, must have existed either about this part of the 
Canadian watershed, or in the same direction farther to the north- 
accord- 
: Wg to 2. a from &. 78° E. to S. 7° W., the least easting 
being foun 
on the west sid 
