188 



Savage and Boss 1 — Age of Iron Ore. 



at the bottom, so that its beds are in a slight degree unconform- 

 able to those below, which constitutes a reason for not grouping 

 the iron beds with the Cincinnati series." 



" Within the limits to which stratigraphical evidence thus con- 

 fines this formation, there can be no hesitancy in referring it, on 

 lithological grounds, to the Clinton epochs, since that epoch is 



Fig. 1. 





Fig. 1. Iron ore bed unconformably overlain by Mayville (Early Silurian) 

 limestone, in an old iron pit in Iron Eidge, near Neda, Wisconsin. 



characterized from Ohio as far eastward as Nova Scotia, and as 

 far southward as Alabama, by a similar deposit of oolitic iron 

 ore." 



Since the above description and correlation of the iron ore 

 in southeastern "Wisconsin were made, geologists have gener- 

 ally assumed the Clinton age of the formation, notwithstanding 

 the fact that the definite correlation was based almost entirely 

 upon the peculiar lithology of the deposit, to the exclusion of 

 the suggestive age indicated by the fossils. 



