CLARK: TAC0N7C REVOLUTION. 145 
ficult work done under difficult circumstances in this difficult 
region than L. W. Bailey. Of all the geologists who have 
touched upon the relations of the Cambro-Silurian and Silurian 
rocks of New Brunswick, no other has been able to correlate 
results into papers of such a philosophical nature as Bailey's 
"The Geological Factors in the Present Configuration of New 
Bninswick,"^ and "On some Geological Correlations in New 
Brunswick. "2 The views of this geologist, arrived at through 
long-continued field work and reflection, should have supreme 
weight. Two factors which, among others, tend to make the 
attainment of exact results difficult in this area, are the lack of 
outcrops showing critical contacts, and the lack of proof of the 
age of the supposedly Cambro-Silurian rocks. Rocks containing 
Ordovician fossils have been reported from the Beccaguimic 
River, but these are not in contact with Silurian strata. Moreover, 
some of the fossils have an aspect more Silurian than Ordovician. 
In 1884, Bailoy "expressed doubts as to the value of geological 
correlation in this area, and by 1901 he had clearly recognized 
the hopelessness of arriving at a clear conception of the geologi- 
cal structure under present conditions. Extracts from two of 
his papers follow. 
"Much uncertainty has, however, existed as to the exact 
position of the boundary between the Silurian and the sup- 
posed Cambro-Silurian rocks which border them on the south, 
as well as with regard to the grounds of their separation; and it 
has accordingly been one of the main objects of recent explora- 
tion to settle these points more definitely. In the summer of 
187U, Mr. G. F. Matthew, in his study of eastern Carleton, 
found evidence of the looked for physical break in the occur- 
renco, along the course of the tributaries of the Becu^aguimic 
Hiver, of conglomerates near the base of the Silurian system 
containing embedded fragments which were clearly traceable 
to the Cambro-Silurian rocks below; while in the same season 
the author of the present report was led to recognize a similar 
hne of separation in the region west of the St. John River. The 
'Bailey, L. W. Trans. Roy. Soc. Canada, ser. 3, voL 3, sect. 4, 
[>. 4r)-().-), 1910. 
^Bailoy, L. W. Trans. Roy. Soc*. ('auada, «i>.t. 2, vol.7, sect. 4, p. 143- 
ir.O, IDOL 
