98 GEOLOGY OF THE THIRD DISTRICT. 



is there flat. Some of its layers are four feet thick. The surface has been worn smooth in 

 many of its exposed parts. 



The next and last place where this rock was seen in Oneida county, was at the Stone pound 

 near Stony creek, which probably takes its name from the naked surface of this rock which 

 is there exposed : the pound is built of it. It is there in more solid blocks and layers, and 

 more acres of it are exposed, than in any other part of its range. It is divided by joints in 

 two directions. It shows the waved lines of deposition or infiltration, as in New-Hartford, etc. 



From the Stone pound there is no ledge of this rock to be seen in all Oswego county, which, 

 firom the swampy nature of the country to the east of Oneida lake, and the thickness of allu- 

 vion along the whole north side of the lake, is not extraordinary ; but it appears in the north 

 end of Cayuga county, at Bentley's quarry, about half way between Martvillc and Hannibal- 

 viUe. It is there a light greenish grey, fine-grained sandstone, in parts mottled with green 

 shale, and in a few parts with reddish purple spots of ferruginous shale. It was quarried for 

 the mill at Martville. The thickness excavated is about four or five feet. On the top is shale, 

 and the thin layers of greenish sandstone which belong to the Clinton group ; and at a lower 

 level in the same quarry, is the red sandstone. The same mass is also quarried on the farm 

 of Robert Hume, four miles from Martville, two and a half from Stirling, and one from the 

 Oswego state road. It was opened for Wolcott furnace. The rock is the same as at Bentley's, 

 and in all respects similar to the grey band, as it appears in the fourth district, from specimens 

 collected by its geologist ; the term grey hand having been used to designate two different 

 rocks or masses as to position, one placed at the bottom of the Clinton group, and the other 

 at the top, and the iron ore beds, the green shale, the fucoides, etc. separating the two. 



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