THE 
AMERICAN NATURALIST 
VoL. xvi1— AUGUST, 1884.—No. 8. 
THE GLACIATED AREA OF NORTH AMERICA. 
BY REV. G. FREDERICK WRIGHT. 
| | AM asked to give, for the convenience of the readers of the 
Naturauisr, a brief summary of the present results of my 
-glacial investigations during the past ten years. This I am ena- 
1 bled to do more concisely because of the plates which I am per- 
_ mitted by my publisher to use so freely.) 
The Special marks characteristic of the glaciated region consist 
of striated rocks, striated pebbles, transported boulders and an 
wetatified deposit called “till.” These are now too familiar to 
need description, My investigations have chiefly had in view the 
_ “termination and study of the southern boundary of the glaci- 
ated area in Eastern United States. I have zigzagged the whole 
boundary from the Atlantic ocean to the State of Iliinois, the 
‘ results being given in the accompanying plates, the correctness of 
which the reader may readily verify for himself, for when one has 
~~ once familiar with the glacial signs indicated above, he 
annot fail to notice their conspicuous absence south of the 
-dary line indicated. 
twill be observed that in New England the rivers reach the 
: le the glacial limit, and they are all characterized through- 
ir whole extent by terraces of coarse gravel, varying 
For fuller details of my work see Proceedings of the Boston Society of Natural 
a xIx, PP- 47-653, Vol. xx, pp. 210-220, Vol. XXI, pp. 137-1455 Ger- 
tof New Hampshire, Vol. Ill, pp. 167-170; American Journal of Sci- 
5 eg, 7 PP- 120-123, Vol. CXXVI, pp. 44-56; AMERICAN NATURALIST, Vol. 
7507 ; but especially my “ Studies in Science and Religion ”: Andover: 
» PP. 256-350, and the “ Glacial Boundary in Ohio, Indiana and 
~ Fund: Western Reserve Historical Society. 1884, pp. 86; Ohio 
Report, Vol. v, pp. 750-771. 
o. VIII, 48. s 
