432 DALE— CAMBRIAN MANGANESE DEPOSITS OF [April 25, 



The manganese according to the recalculation of the analysis is 

 essentially in the form of a rhodochrosite and whatever manganese 

 there is in excess probably exists as a peroxide. It is quite possible 

 that Ca3(P04)2 exists in the irregular black fine-grained areas, 

 though nothing definite can be said in confirmation of it at this time. 



Section of the Lower Cambrian from the Base of the Lower 



Paradoxides Zone down to the Top of the Smith 



Point Limestone, Trinity Bay (Fig. 47). 



Loc. Number. Ft. 



230 D 32 Thin seams of nodular limestone in red shale 4.0 



31 Bright red shale 46.0 



30 Gray green shale 14.0 



29 Dike 3.0 



28 Bright red fissile shale with thin green seams and patches .... 97.0 



2.'] Manganese limestone (manganiferous dolomitic shale) 3.5 



26 Bright red fissile shale 78.0 



25 Grayish green fissile shale 28.0 



24 Bright purplish shale alternating with bright red shale 97.O 



23 Green gritty shale 33.O 



22 Gray band of fine grain siHcious limestone full of pyrites and 



same brachiopods and trilobites 0.5 



21 Gritty green shale, brachiopods and trilobites 62.0 



20 Heavy green silicious conglomeratic manganiferous limestone 2.5 



19 Purple shale lo.o 



18 Green shale lo.o 



17 Red shale 47.0 



b — Contains trilobite fauna 13.0 ft. 



a — Red shale 19.0 



Interval covered 15.0 



16 Smith Point Limestone. 



Total S3SS 



V. OTHER MANGANESE DEPOSITS OF SOMEWHAT SIMILAR 



CHARACTER. 



Sedimentary deposits of manganese are not of uncommon occur- 

 rence but it is rare that we find such deposits still in their unaltered 

 condition as they were originally formed. There are however a few 

 deposits elsewhere which in many respects resemble the Conception 

 Bay and Smith Sound occurrences. 



Newfoundland, Placentia Bay. In Placentia Bay, New- 



