298 G. S. Hume — Stratigraphy and Geological Relations 



of fracturing through Cobalt to the fault on the north- 

 west and southeast line along the western shore of Lake 

 Timiskaming, are not clear. Since a number of prospects 

 and mines have been found near the general line of dis- 

 turbance which includes Cobalt, it has been argued (Miller 

 1913) that mineralization has been connected with this 

 fracture zone. At Cobalt the faulting is later than the 

 Nipissing diabase, and it may be that shortly after the 

 intrusion of the diabase sills, with which mineralization is 

 connected, the fracture system was inaugurated, at least 

 along the line here indicated. However, whatever the 

 time of origin, the evidence is clear that there was crustal 

 movement subsequent to the deposition of the Silurian 

 about Lake Timiskaming. It is this later movement that 

 has given rise to the renewed faulting now shown in the 

 present fault-line scarp along the western shore of the 

 lake and northwest of it. 



Physiography. 



Terraces and beaches. — Following the retreat of the 

 continental glaciers, a lobe of ice blocked the southern 

 drainage system through Lake Timiskaming and the Ot- 

 tawa valley (Coleman 1909) causing the formation of a 

 large glacial lake (south of the Continental Divide) which 

 Wilson (1918) has called Lake Barlow. The deposits of 

 Lake Barlow consist of very evenly stratified clays in 

 which terraces were formed due to the subsidence of the 

 lake in stages depending on the height of the outlet. 

 These terraces now appear at 35, 110, and 140-170 feet 

 above the level of the lake. 



Beaches belonging to Lake Barlow are also known west 

 of Haileybury and New Liskeard. The beaches to the 

 south are at a slightly lower elevation than those farther 

 north, the elevation being about 280-290 feet above the 

 level of the lake. 



Tilting to the south and post-glacial faulting. — Subse- 

 quent to the retreat of the ice, there seems to have been 

 some response to isostatic readjustment, due to the re- 

 lease of load. Miller (1913) has stated that at Cobalt 

 slight post-glacial faulting has taken place. No similar 

 movement could be detected in the area of Paleozoic rocks, 

 because of the weathered condition of the clays. How- 

 ever, the fact that Blanche river flows for many miles in 



