^2 NEW YORK STATE MUSEUM 



active, producing about 60,000 tons a year when operated. They 

 were closed down last in November 1907, after a campaign of two 

 years. 



The exposures of the Clinton strata at this locality have much 

 interest, as indeed they afford one of the best sections of the forma- 

 tion in eastern New York. The following is the succession as given 

 by C. H. Smyth jr.^ 



MATERIAL FEET 



Calcareous sandstone and thin shale 50-I- 



Non-oolitic ore (red flux) 6 



Calcareous sandstone 6 



Blue shale and thin sandstone 15 



Oolitic ore 2 



Shale 2 



Oolitic ore i 



Blue shale and thin sandstone 100+ 



The red flux bed reaches its greatest thickness at this point. The 

 oolitic ore alone is mined. The existence of two oolitic beds in the 

 Clinton section has been generally accepted as a normal condition, 

 but this is not the case. There is convincing evidence to show that 

 the lower seam represents nothing more than a split in the main bed 

 due to a thickening locally of the shale or sandstone parting that is 

 nearly everywhere present. There are few places where the two 

 beds are more than a few inches apart. As a rule the ore in this 

 vicinity really measures from 30 to 36 inches, that is the combined 

 thickness of the two beds, and it has been the recent practice to ex- 

 tract the entire oolitic ore without reference to the intervening rock 

 layer. 



The composition of the oolitic ore at this locality is shown by the 

 following analyses. 



I 2 3 4 5 



FegOs 69.17 42.97 79-98 63 71.82 



SiOs 11.57 29.72 9.98 12.63 11.34 



AI2O3 3.92 4.13 2.4 5.45 3.91 



MnO .19 .37 tr. .15 1.63 



CaO 5.8 8.57 1.54 6.2 3.97 



MgO 2.27 1.96 .3 2.77 2.21 



S 28 .837 Nil .23 Nil 



P2O5 1.726 1.534 1.239 1.5 2.096 



^ J. F. Kemp. Ore Deposits of the United States. 1896. p. 104. 



