Figure 6 . 
Nor theast i 
lOOO fest. 
500 

Pre-Cambrian Potsdam 
Beekmantown 
Chazy 
Black River Trenton Utica , 
Southnc.it of M&doc the Trenton 
may include Bcektnantown , Chazy, 
and Black River, it is separated 
from the Prediarn br/aji by arkoset 
or sandstone in the foil owing borings:- 
Whitby (S' . York (f 0' j, Toronto(20'j and 
New Toronto (72') 
Lorraine Utica, and Oueenston Medina 
Lorraine 
(Not differentiated 
southwest of Modoc j 
Niagara 
Sa/ina Onondaga and 
Oriskany 
Fault Well borings 
(depth m feet) 
Geological Survey, Canada 
Cross — section from the Laurentian Plateau to Lake Erie at ST Thomas, Ontario 
The fine of section in the Ontario Peninsula, is about normal to the strike 
1527 
Location of Section shown on FigS. 
To accompany Bulletin by 
E M. Kindle and L.D Burling 
Horizontal 
5ca/e 
IO S 0 
10 
20 30 
40 
50 
l 
50 
1 
70 
LiJ ul.^, . 1 
... 1 
■ ■ . 1 i 
1 
i Miles 
