EARLE, INTERBEDDED IRON ORE DEPOSITS 15g 



widely different ages. If these artesian runways have been so situated 

 that mineral-bearing solutions could penetrate their porous layers, there 

 is no reason why deposits similar to those of the Clinton age should not 

 be formed. 



The exact stratigraphic position of several of the so-called Clinton 

 beds is uncertain, and when the fossil content of these beds has been 

 worked out, some changes may be expected in their stratigraphic posi- 

 tion. The geologic position of some of the interbedded hematites and 

 magnetites of Nova Scotia, which by some have been classed as Clinton, 

 is still in doubt. 



The writer has used the tenn Clinton more to characterize a type of 

 deposit than the ore from a definite geologic horizon, and it is probable 

 that several beds referred to as of Clinton are not of Clinton age. It is 

 certain, however, that all the occurrences treated in this paper are well 

 within the Paleozoic. 



DEPOSITS OF WABANA, BELLE ISLE, NEWFOUNDLAND 



The Wabana deposits of Newfoundland would appear to meet the 

 requirements of the artesian theory fully as well as the beds already 

 referred to under the Clinton. The porous layers now represented by 

 the ore beds, the impervious or less porous adjoining layers giving good 

 artesian runways, the marine slope giving the proper inclination to the 

 beds and the necessary limit of the porous layers by marine slope methods, 

 and finally the great depth and continued richness of the deposits, all 

 point toward artesian replacement, 



DEPOSITS OF THE MIRA VALLEY, CAPE BRETON, N. 8. 



The Cambrian ores of the Mira Valley, Cape Breton, also haVe the 

 necessary factors of artesian ore deposits. The iron ores occur in lime- 

 stones and quartzites as the porous layers with slates interstratified, thus 

 giving the same general conditions as were noted in the usual type of 

 Clinton deposit. 



Study of other deposits indicates that although this theory is more ex- 

 tensively applicable to the Clinton ores, it is equally applicable to similar 

 beds of iron ore in other horizons and may be found useful in working 

 out the origin not only of other iron ores but other minerals as well. 



General Summary and Conclusions 



The advocates of the sedimentary theory, although advancing many 

 plausible arguments in favor of their ideas of origin of the Clinton ores, 



