﻿74 NEW YORK STATE MUSEUM 



The section terminates downward 20 feet above the river level. 

 Above, after a 10 foot gap, come 15 feet of thick and thin bedded, 

 dove limestone, often mud cracked, and then the Lowville base, 

 giving an 80 foot thickness to the section. It is not certain whether 

 its base overlaps the summit of the previous section of the lower 

 division or not, though it is thought not. But the uppermost 6 feet 

 of that section belong to the upper division and the thickness is 

 nearly the same as that of the impure, earthy limestone at the base 

 of this section. Even granting that amount of overlap, the two 

 sections taken together give a certain thickness of 150 feet to the 

 formation and this may need to be increased by from 10 to 20 feet. 



Another most excellent section is that given in a quarry up the 

 river bluff 4 miles west of Clayton [pi. 17]. A slightly general- 

 ized statement of it will serve the purpose here. 



1' 8" Thin bedded, dove limestone 



5' 6" Gray white, dmpure earthy limestone, mostly thin bedded, some 



thick and irregular beds 

 7' 5" Rather massive limestone beds averaging 20" in thickness, gray in 



color, in part earthy, in part subcrystalline 

 2' ' 9" Dove limestone, three beds, the lower thick, the two upper thin 

 3' Hard, gray, subcrystalline limestone, two thick beds with a thin 



shaly parting between 

 1' 5" Dove limestone, two beds 

 1' 8" Hard, gray limestone, upper inch is shale 

 1' 8" A hard, dove limestone layer 

 1' Gray white, earthy limestone, thin bedded 



2' 9" Brittle, gray, subcrystalline limestone 

 1' 8" Massive, dove limestone bed 



n" Thin bedded, whitish, earthy limestone 

 1' Gray, subcrystalline limestone, slight pinkish tinge 



7' 1" Gray, earthy limestone in thick beds with shaly partings; a thin 



dove layer near the top ; reddish tinge at times 

 0/ 6" Blackish limestone, upper bed very massive" 



49 



The black limestone at the base of the section seemed to the 

 writer to smack strongly of the lower division, though the marine 

 fauna was but feebly developed, and Ulrich expressed doubts in 

 the matter. Certainly beds of the type are not usually found in the 

 upper division. A short distance back from the river another 

 quarry shows a thickness of 15 feet of the succeeding beds, the entire 

 thickness being of dove limestone, both thick and thin beds, with 

 sparing fossils. Further back, by the roadside is a shallow quarry 

 exposing 4 feet of still higher beds, two massive dove layers with 

 similar but thinner beds between, the thick beds holding Phytopsis. 

 Such beds elsewhere mark the extreme summit of the Pamelia. 

 Were the upper part of the section complete there would be shown 

 here a thickness of more than 80 feet belonging to the formation. 



