348 
2^he American Geolor/isf. 
Docembor, 1897 
Picnic ground, Taylor's Falls 905 feet 
Public school building, Taylor's Falls 900 " 
Toll bridge, Taylor's Falls 725 " 
The differfmt topographic features are clearl}' displayed on 
the accompanying maps. The different surface features in 
their geoh)gical bearings are elsewhere discussed. It should 
be noted here that the morainic ridge and accompanying 
eastern plateau constitute the most elevated portion of the 
district. These attain an elevation of 1215 feet. The till 
plains, stretching through the western part of the district and 
from Dresser Junction southwestward, lie at an average ele- 
vation of 925 feet. The river gorge is an abrupt descent of 
more than 200 feet. TJuis the diiference in elevation of dif- 
ferent parts of the area amounts to more than 500 feet. 
Next to the glacial drift, the most potent factors in deter- 
mining) the topographic modifications of the surface features 
are the bold ridges of igneous rock. 
Fig. 1— Outline map locating the St. Ceoix dalles area. 
