IRON ORES OF THE CLINTON FORMATION 4I 



Tlie character of the fossil ore is shown b}' tlie following 

 analysis made by E. l^ouceda on a sample of the ore. 



FcgO. 40 . 92 



SiO.f 7.06 



TiO, tr. 



AI2O3 II • 13 



MnO tr. 



CaO 14.68 



MgO 3.84 



SO3 . 025 



P065 1.02 



ca 16.3 



U,d (combined) 4.88 



99-855 

 Iron 28 . 64 



Phosphorus . 445 



ORE DISTRIBUTION AND RESOURCES 



Over most of the area occupied by the Clinton, the hematite 

 beds contribute an essential feature to the sedimentary succes- 

 sion. They are, indeed, next to the shales, the most persistent 

 element in the formation as represented in the State, having a 

 wider development than either the limestones or sandstones. 



Their eastern and western limits are somewhat indefinite, 

 due to the long intervals between exposures ; it is a question, 

 also, not of an abrupt termination, but of a gradual thinning to 

 disappearance with the progressive diminution of the formation 

 itself. 



At Rochester, the extreme westerly point where the ore is 

 known to be represented, there is a single bed of fossil hematite 

 14 inches thick. This is very likely a continuation of the bed 

 which stretches across Wayne county and is mined at Ontario 

 Center. 15 miles northeast of Rochester. At any rate the 

 ore shows so moderate a decrease within the interval that its 

 continuit}^ for a considerable distance farther west seems |)rob- 

 able. P>eyond Rochester tliere arc no good exposures mitil the 

 Niagara gorge is reached where the ore fails entirely and the 

 whole section of the Clinton is reduced to 40 feet or less. 



