66 



The Temiskaming series was invaded, first by lam- 

 prophyre dikes, and later by the great mass of Lorrain 

 granite. Good contacts of the Lorrian granite and Temis- 

 kaming series are to be seen immediately south of the 

 Temiskaming mine, and at Kirk lake. 



West of Haileybury about three miles, an unconformity 

 is exposed between the Temiskaming and Cobalt series. 

 Here, at the southwest corner of lot 7, in the fourth con- 

 cession of Bucke, the Cobalt conglomerate rests on the up- 

 turned edges of the Temiskaming greywacke, the latter 

 showing distinct bedding. Nearby, the older series is cut 

 by lamprophyre dikes, which do not, however, invade the 

 Cobalt sediments. In the same neighborhood there are 

 several places where the two series are separated only by 

 a few feet of drift, but the discordance of the dips is so 

 striking that there can be little doubt about the existence of 

 the unconformity. At Fleming Corners the flat lying, slate- 

 like greywackes of the Cobalt series are in marked contrast 

 to the disturbed Temiskaming sediments one-half mile to 

 the east. 



Boulders of conglomerate of the Temiskaming series are 

 found in the conglomerate of the Cobalt series, as shown in 

 the accompanying illustration. 



The thickness of the Temiskaming series cannot now be 

 determined with certainty. In one locality it is known to 

 be at least 7,000 feet. 



LAMPROPHYRE DIKES AND LORRAIN GRANITE 



Near Kirk lake, both lamprophyre and granite intrude 

 the Temiskaming series, and the lamprophyre is seen to be 

 older than the granite. 



Lamprophyre dikes are numerous in the area. They 

 are, for the most part, characterized by the prominence of 

 hornblende, biotite or augite. The following types are 

 probably present, viz. : minette, kersantite, vogesite and 

 camptonite. The rocks vary in grain from fine to coarse, and 

 in width from a foot to twenty feet or more. While they are 

 somewhat disturbed, and in some cases much decomposed, 

 they are usually massive rather than schistose, and fre- 

 quently preserve their original textures. 



The distribution of the Lorrain granite is shown on the 

 map of Cobalt, scale one mile to an inch. The rock is a 



