IRON ORES OF THE CLINTON FORMATION 



37 



The hole is about midway between SterHng Station and the west 

 end of Oneida lake, an interval that seems to be barren of workable 

 deposits. More tests are needed, however, to demonstrate their 

 entire absence, since the distance to the Martville locality is lo 

 miles and to Brewerton, the next drill site to the east, about 12 miles. 



Brewerton, Onondaga co. The drill was set up on the south 

 shore of Oneida river, within the village, about 75 yards west of 

 the bridge. This point is very near the Oswego-Onondaga county 

 border and the south line of the route followed by the new Barge 

 canal. 



SECTION AT BREWERTON 



Strata 



Character 



Olive-gray shale with many 

 dark bands in the lower part and 

 with few thin bands of limestone. 

 At 19 feet there is a 4 inch band 

 with black pebbles. 



Fossil ore, inclosed in shale. 



Shale with limestone bands 3 to 

 4 inches thick found at quite 

 regular intervals. The limestone 

 contains cavities lined with crys- 

 tals. Traces of ore, as threadlike 

 veinlets, are found in the lime- 

 stone. 



Shale with thin bands of lime- 

 stone that probably represent the 

 pearly layers. Trace of ore at 

 133 feet. 



Oolitic ore. 



The layers below the ore are 

 quite variable. The 2 inches 

 immediately below the ore is 

 shale ; then follows a sandstone or 

 conglomerate, becoming coarser 

 toward the bottom. 



This section is similar to the one at South Granby in showing 

 two ore seams separated by many feet of rock. The absence of 

 limestone is a striking feature and serves to connect this section 

 with the eastern development of the Clinton, as e.xemplitied in 

 Oneida and Madi.son counties, rather than tlio western belt. This 

 is further indicated 1)y the oolitic structure of the lower ore seam. 



The 16-inch bed is solid ore of uniform character. It will rei):iy 



