﻿67 Oriskany Falls 17 



vamixemt 10.0 



14. Grayish waterlime? basal portion apparently gypsiferous... 21.0 



Up in the fields to the east, as has been stated already, there 

 are many fine exposures. They may be arranged in a vertical 

 section thus : 



Section in field iyi miles N. of Perryville 



Ft. Thick 



1. Onondaga limestone 20+ 



2. Helderbergian beds containing in places an abundance of 

 Gypidnla galeata 20 



3. Blue, cracked limestone 10 



4. Stromatoporoid limestone, with blue and cracked layers.... 20 



5. Gray, thin bedded 7 



6. Stromatoporoid limestone 4 



In the vicinity of the plaster mill on the railroad 1 mile south' 

 west of Cottons one can see highly disturbed light colored Salina 

 limestones. In the hillside just south of the mill such a lime- 

 stone forms a slight terrace beneath the pasture soil. Above it is 

 an extensive gypsum quarry showing perhaps 25 feet of plaster 

 rock. Above that, other limestones are seen in another opening; 

 none however appear like typical Cobleskill. 



Points of special interest in the Perryville area.— (i)The Helder- 

 bergian rocks are increasing in thickness going eastward. They 

 are much more fossiliferous than at Manlius. They contain 

 Gypidula galeata. The lower beds herein classed as Helder- 

 bergian have a decided Manlius faunal aspect. 



(2)The typical Manlius beds as well as the Stromatopora and 

 other beds up to the Helderbergian are much thinner than at 

 Manlius. Stropheodonta varistriata is comparatively rare except 

 in a stratum 2^ ft. thick in the Perryville Falls section. 



(^)Spirifer vanuxemi beds here as at Manlius are just above 

 the light colored Rondout layers. 



V Oriskany Falls 



We have already referred to the importance of this section in 

 any study of the Manlius stage. Prof. S. G. Williams* remarks: 

 "The exposure of Lower Helderberg rocks at Oriskany Falls, 



*Amer. Jour. Sci., 3d Ser., 1886, vol. 3r, p. 142. 



