Geology of Seneca County. 86 



buff and bluish, with some lamination streaks. When compared 

 with the exposures at Phelps, Ontario county, it appears to cor- 

 respond with a series found in the bed of Flint creek at the 

 dams, where contact with Lower Helderberg limestone is found, 

 which is wanting at Seneca Falls. 



A very similar rock, in slabs of an inch or two in thickness, 

 has been newly exposed by ^he roadside, half way to Waterloo, 

 600 feet west of Kingdom bridge, on the south side. This is the 

 most southern exposure known to me. It is doubtless very near 

 the southern limit (see Upper Helderberg). 



A gas well in the southern part of Seneca Falls village is said 

 to have struck Niagara limestone at 980 feet. If we allow 16 

 miles for the width of the formation, and a northward fall of 

 the land of 60 feet, we have an average dip of 57^ feet per mile to 

 the- south. (^' = 57i). 



This well, known as No. 2, is the southernmost, and is probably 

 not far from the border of the formation. It may be compared 

 with that described by Prosser (Amer. Geologist, Oct., 1890), 

 which is half a mile to the north and considerably east. 



No. 2. Prosser's. 



Elev. A. T 445 — 385 = 60 



To Niagara rock 980 — 950 == 30 



If these data are reliable the dip is here northward. 



A comparison of well No. 2 with one three miles north of the 

 village at nearly the same elevation gives a local dip of 40 feet 

 per mile southward. The well in question reached Niagara rock 

 at 860 feet = 120 feet less than well No. 2. 



