LOCALITIES OF SUPERPOSITION. -> 199 



The wood-cut No. 60, already noticed, showing the section to the south of Little-Falls, 

 exhibits the same series as at Fox hollow, with the exception of the red shale, which is there 

 wanting. The red shale makes its first appearance near Crugar's sawmill, and continues 

 thence west through the district without interruption, and with increasing thickness. 



As the Niagara group does not extend so far east, its position only could be indicated ; 

 coming in between the projecting part of Nos. 8 and 9 of the one section, and 3 and 4 of the 

 other. It makes its appearance in the water courses further west, but is best exhibited at 

 Hart's or Griffin's mill, on the road from Clinton village to Waterville. 



G + 



Section at Hart's mill. 



The above wood-cut represents a section which appears on both sides of the creek at the 

 south end of the mill. 



No. 1 shows the concretionary masses which correspond to the Niagara limestone. It is enclosed in 



bluish slaty layers. 

 No. 2 is a bed of green shale, in all respects like the great mass of red shale, with the exception of 



color. 

 Nos. 3 and 5 are red shale ; between which, at 

 No. 4, there is green shale, and a thin layer of sandstone, from one and a half to three inches thick. 



All the shales, etc. above the blue kind, belong to the Onondaga salt group, the base of the 

 Helderberg division ; the Niagara group being the upper member of the Ontario division. 



The Oriskany valley in which Hart's mill is situated, consists of the rocks of the Clinton 

 group, from Stebbins' creek north of Clinton village, to near the mill ; the junction with the 

 Niagara group being there concealed. 



It was the intention of the reporter to have exhibited a section of Cherry-valley, showing 

 the position of the Pentamerus limestone, the Catskill shaly limestone, the Cauda-galli grit, 

 and other members of the Helderberg division, the character of the lower ones being so much 

 better exhibited there than at Oneida creek, the next locality of superposition. The omission, 

 however, is not much to be regretted ; since the section on the west side of Schoharie creek, 

 near the county village, in the first district, is at no great distance from Cherry-valley, 

 where the same series, including the Oriskany sandstone, is well displayed ; being one of the 

 finest natural sections of the State, and admirable also for scenographic delineation. The 

 advantage gained at Oneida creek, is the connection between the Helderberg and Erie divi- 

 sions. 



