14 NEW vokk SI A i B MUSEUM 



naceville iron ore. The name of this bed is from Furnaceville 

 in \\ a\ ne • "inn \ , near w hich pla< e the ore has been worked for many 

 years. The ores oi the Clinton 1 have a very wide areal distribution 

 ,ii\.l have various names applied to them, as oolitic, lenticular and 

 fossil ores. In structure the ore varies in different sections. At 

 Rochester there is a replacement <»t' fossils, such as crinoids and 

 bryozoans. In addition there is a i onsiderable number of spherules, 



each made up of a nucleus of silica surrounded by a number of thin 



concentric coats of ferric oxid and silica. The ore at Rochester is 



Strictly a fossil ore, hut Owing to the presence of lenticular shaped 

 spherules, it may be referred to as lenticular or oolitic ore. The 

 ore is hematite or the sesquioxid of iron (Fe ). On account of 

 the earth\- texture of this ore, it is always red ill color. 



Iu the vicinit) of Clinton, X. Y. there are three distinct beds of 

 these ores. In passing west, the upper beds fail and the remaining 

 one shown in the Rochester section is 14 inches thick. This ore bed 

 can not extend far west of Rochester, for here is the last known 

 exposure and at Niagara Falls the bed docs not exist. 



The ores of the Clinton group are of great economic importance 



and beds as thin as 22 inches are at present being profitably 

 worked. In New York the iron is mined at Ontario, Wayne county, 

 Sterling Station, Cayuga county, and near Ctica in the town of 

 Kirkland. 



Wolcott limestone. This limestone has been traced from the Niagara 

 river eastward to Cayuga county. It undoubtedly extends farther 

 east, but on account of poor exposures and probable change in litho- 

 features and fauna] contents, it has not been recognized. This 

 limestone is named from Wolcott in Wayne county, from which point 

 west to beyond the Genesee the large brachiopod Pen tamer US 

 oblongus is very characteristic of the division and on this 



a< count it was formerly (ailed the IVntamerus limestone. This 

 fossil becomes less abundant in going west from Rochester and 

 at Niagara it is not found though farther west in Ohio and Indiana 

 : t <)( 1 u rs in the Clinton strata and again higher up in the Guelph 

 limestone. 



At Rochester this limestone is 14 feet thick. It is well shown at 

 the middle falls, of which it forms tin- < rest. Loose fragments of the 



tlit. ( .. 11. jr. Am. J. . 



