1884.] The Glaciated Area of North America. 759 
height. 
Fig. 3 shows the boundary line across Pennsylvania with 
aremarkable bend to the north as it crosses the Appalachian 
mountains, passing through Northampton, Monroe, Luzerne, 
Columbia, Lycoming, Tioga and Potter counties, thence through 
Allegheny and Cattaraugus counties in New York, thence back 
again in Pennsylvania through Warren, Venango, Mercer and 
Lawrence counties, 
material rising in hills from thirty to seventy feet in 
1 
Pie. 4—Map showing southern boundary of glaciated area of Ohio. 
i In Fig. 4 the dotted portion shows the glaciated area of Ohio. 
' aas ls respecting the boundary in New Jersey, see the report of Professors 
a Smock for 1878, 1879, 1880. 
See the joint report of Professor H. Carvill Lewis and myself, soon 
tF 
be issued : 
x by Professor Lesley as a part of the State geological report. 
