7i 



Order of Deposition. 



The surface of the region, in the period immediately pre- 

 ceding the deposition of the Cobalt series, was uneven, and 

 possessed in all probability higher hills and deeper valleys 

 than those of the present surface. Having been laid down 

 on such an uneven floor, the series cannot be expected to 

 show the same thickness of sediments everywhere, even had 

 a great period of erosion not elapsed between the deposition 

 of the sediments and the present time. Moreover, it would 

 be expected that there would be a considerable variation in 

 the order of succession of the sediments from those that lie 

 at the base to those that form the upper members. While 

 such variation in the thickness of the members of the series, 

 and in their order of deposition, has been observed, as is 

 shown in the following table, still, there is a pronounced 

 definite order of deposition in the areas which have been 

 studied by various workers throughout a wide region. 



The following table shows the thickness of the Cobalt 

 series at several characteristic localities, and the nature of 

 the sediments, together with the order of deposition : 



Wendigo Lake 



Little Silver 

 Cliff (Cobalt) 



Mt. Chemaniss 



Mt. Sinclair 



Maple Mountain 











Arkose and quart- 



Conglomerate* 



Conglomerate 

 (30 to 40 ft.) 



Conglomerate 

 (100 ft.) 



Conglomerate* 



zite (900 ft.) 



Greywacke" and 











quartzite (23 ft.) 



Quartzite 

 (15 ft.) 



Quartzite 

 (135 ft.) 





* * * 



Quartzite (10 ft.) 









* * * 





Greywacke" 



Greywacke" 



Greywacke" 





Greywacke' (54 ft.) 



(20 ft.) 



(315 ft.) 



(300 ft.)** 



# # # 



* * * 



* * * 



* * * 



Conglomerate* 



*** 



Total 90 ft. 70 ft. 550 ft. 300 ft. 900 ft. 



*Thickness not given. **Greywacke" contains occasional beds of slate and quartzite, 

 ***Base of section is not exposed. 



The arkose and quartzite of Maple mountain are con- 

 sidered to represent the Lorrain or upper part of the Cobalt 

 series. This mountain contains the greatest thickness of 

 sediments known in the region. 



The exposure on the shore of the bay, on the east side 

 of Lake Temiskaming, just south of Fabre wharf, may be 

 cited as an example of a section where members of the 

 series are absent. Here the upper conglomerate lies 

 on the surface of the well-banded arrevwacke. 



