101 
GENERAL MEETING 
ON SECTION 
ma] 
‘ 
SECTION (7 oer e 
T. = Tonto. 
Ep ers = $ 
~ ~~. 
4A : 
rn 6 
; K 
ths z | 
3 { See |S i 
x ' “Te (=z 
rt + H i ai : m hile ie ome iz occu 
z =I { ( ty 
? B 4 
' ‘ ' yy 
: i : = x 
ii Se —St. J; 
ate ene awn e--} ---—--- a 
S 
& 
a 
ae 
! ; z 
TYPICAL CAMBRIAN SECTIONS. 
qe we = = - - - 
G. C, = Grand Cafion. P. = Potsdam. G. = Georgian. St. J. = St. Johns. 
Maximum thickness of Cambrian = 50,000 + feet. 
POTSDAM 
GEORGIAN 
CAMBRIAN 
ACADIAN 
K. = Keweenawan. 
