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The; Temiskaming Series. 



This series of rocks has been described in preceding 

 pages in connection with the Cobalt area. 



At Porcupine the series is of much greater economic 

 interest than at Cobalt, since important gold deposits have 

 been found in it. 



The largest area of these rocks at Porcupine stretches 

 from the Dome mine in a northeast direction for about ten 

 miles. It consists of slate, quartzite and conglomerate 

 which have generally been greatly disturbed. The beds 

 have been highly tilted, dipping at angles of 70° to vertical. 

 A secondary cleavage has frequently been developed, and 

 the rocks have been rendered quite schistose. The general 

 direction of the strike is from N.E.-S.W. to E.-W. In this 

 respect the series is related to the Keewatin which has a 

 corresponding strike. It is evident that much of the 

 deformation of the Keewatin was post-Temiskaming. 



The sediments at the Dome have been greatly altered to 

 schists. Similar rocks around Three Nations lake have been 

 less altered, and, except for a high dip, greatly resemble the 

 Cobalt series. 



The succession of Temiskaming strata is well shown at 

 the property of the Three Nations Mining Company on lot 

 5 in the fifth concession of Whitney. Along the line 

 between the fifth and sixth concessions very much altered 

 Keewatin rocks, now largely serpentine and rusty carbonate, 

 are exposed. The contact with the Temiskaming" conglomer- 

 ate practically follows, this line. Here, at the base of the con- 

 glomerate, are numerous fragments of rusty-weathering 

 Keewatin rocks ; while farther to the south there are 

 numerous pebbles of acid rocks, including quartz-porphyry, 

 felsite, etc. The conglomerate is overlain by a narrow. band 

 of fine-grained black slate, which splits in very thin layers. 

 Overlying the slate is a greywacke which becomes coarser 

 towards the south. About half a mile south of the con- 

 cession line the rock is quite coarse-grained, and may, be 

 called an arkose-like quartzite. Throughout the Temis- 

 kaming series there is considerable carbonate, and manv 

 samples effervesce briskly with acid. 



It should be noted that no granite pebbles were found in 

 the conglomerate. It is believed that the series was laid 



