77 



banded greywacke has a much greater thickness, as shown 

 in the table on a preceding page. 



At the Little Silver cliff, on the Nipissing property, the 

 base of the Cobalt series is not exposed. Here there are 

 fifteen or twenty feet of well-banded greywacke, overlying 

 which there is about the same thickness of feldspathic 

 quartzite. Above the latter is twenty or thirty feet of con- 

 glomerate. 



At times the quartzite is interbanded with greywacke 



Conglomerate. 



What may be called the second conglomerate, to dis- 

 tinguish it from the conglomerate and breccia that lie at the 

 base of the well-banded greywacke, or in other words the 

 conglomerate that overlies the quartzite, is one of the most 

 interesting members of the Cobalt series. The great variety 

 of pebbles and boulders that are found in this rock give to 

 it an appearance that attracts attention. It contains 

 boulders representing practically all of the numerous older 

 rocks of the region. Whether it represents a glacial deposit, 

 or whether it is of torrential or other origin, in the opinion 

 of many observers, is undecided. 



The conglomerate of the Cobalt series is distinguished 

 from that of the Temiskaming series chiefly by the fact that 

 pebbles and boulders of pink granite, rather coarse in grain, 

 are characteristic of the former and not of the latter. This 

 is owing to the fact that the granites of the region, that 

 antedate the Temiskaming series, are typically grey in 

 color, while the pebbles and boulders in the conglomerate 

 of the Cobalt series have been derived from the pink-colored 

 Lorrain granite, which intruded the Temiskaming, but is 

 older than the Cobalt series. Moreover, the members of 

 the Temiskaming series dip at high angles while those of 

 the Cobalt series are usually but slightly inclined. 



Origin of the Conglomerate. 



In the first edition of his report on the Cobalt area, 

 concerning the origin of the conglomerate the writer said: 

 " It is difficult to understand, for example, how certain 



