﻿65 Perryville i 5 



mon ; Megambonia aviculoidea, Meristella latvis ? Tentaculites, 

 Bcvrichia and LeperdiHa also occur. (3)Above the fossiliferons 

 zone comes the well-known cement and blue limestone beds; 

 then the ragged Stromatopora bed and other blue limestones, all 

 presumably of Manlius age, though difficult to correlate owing to 

 the lack of a characteristic fauna. Nowhere else are these so well de- 

 veloped. (4)The Helderbergian beds have put in an appearance 

 and contain a fauna that is probably to be correlated with the 

 Coeymans farther east. These beds are 10 ft. thick east of Manlius 

 and do not appear to the south-west or west ; unless one large 

 cast of what seemed to be a Gypidula galeata found by Mr. 

 Pacheco in the black, arenaceous ferruginous Oriskany, may be 

 regarded as indicating a further extension of these beds. 



IV Perryville 



General section. — We have endeavored to show by Sec. 4, on 

 Plate I how, in general, the Manlius beds occur about Perryville. 



Following the creek but a few hundred feet north of the 

 railroad station at Perryville one sees a great chasm, bordered 

 above by Onondaga limestone beds, but exposing on either side 

 Helderbergian and Manlius limestones. The railroad sweeps 

 around the head of this chasm and leaves the village by going 

 north-west instead of continuing in an easterly direction. From 

 1 to 1 y 2 miles north of the station along the railway fine ex- 

 posures may be seen. Upon the hills ^mile to the east of these, 

 other good exposures are to be found. Again, on the hill a mile 

 west of Cottons, marked g2oon the U. S. Top. Quadrangle (Chit- 

 tenango) gypsum beds with their over- and under-lying lime- 

 stones occur. All these places have been visited and the general 

 stratigraphic information obtained is shown by Sect. No. 4, 

 Plate I. 



Detailed sections about Perryville. — There is a considerable 

 change in the appearance and thickness of the various Manlius 

 and Helderbergian beds about Perryville and hence several sec- 

 tions are given herewith in detail. 



Section in gorge at Perryville falls ; east side 



Ft. Thick 



1. Onondaga limestone 20.0 



Note the overhanging appearance of the Onondaga beds, and 

 the jogging in of the escarpment in the proximity of the Oris- 



