﻿6 Bulletin 18 32 



by the Black River limestone ; but in some sections the Trenton 

 limestone seems to be in contact with the Calciferous, and the 

 Birdseye and Black River are wanting. (This determination de- 

 pends eutirely upon the lithological character of the rock.) The 

 fossiliferous beds are, with one exception, found within 45 feet 

 of the contact with the Trenton limestone. The rock containing 

 the abundant fossil fauna has a very characteristic appearance. 

 It weathers to a light gray and in this respect differs from the 

 greater portion of this formation which weathers yellow. The 

 fossils are found in the purer limestone at the partings of the 

 beds. These beds occur throughout the Ft. Hunter-Tribes Hill 

 region, at Canajoharie, and were last met with in a thin bed near 

 the top of the formation at Little Falls. They are usually 

 largely made up of water-worn limestone pebbles. The most 

 abundant fossils throughout are Riberia nuculitiformis and turgida, 

 Ophileta levata, Pleurotomaria hunterensis, and Raphistoma obtusa. 

 In many cases the fossils appear to be much water- worn. 



These fossils are in Prof. C. S. Prosser's "B 4" * of the 

 Tribes Hill section, which he characterizes as follows : " Strongly 

 fucoidal, massive beds of bluish-gray color, capped by a blue thin 

 layer containing Ophileta complanata Van." 



The only other bed in this section which was found to contain 

 fossils is one 90 feet below the Trenton limestone in the bank of 

 the creek which flows north of the Methodist church in the 

 village of Tribes Hill. This bed is replete with fragments of 

 Asaphus canalis (?) Conrad, but no other fossils were collected 

 from it. 



The Ft. Hunter-Tribes Hill section was worked with consider- 

 able care, but the region to the west was visited very hastily and 

 a number of localities not mentioned in this paper will, without 

 doubt, be found by more careful search. 



The Tribes Hill section, in detail, is as follows : 



A t . 1 in. Bed of pyritiferous limestone containing abundant 

 fragments of Asaphus canalis (?) Con. This bed is a part of a 

 shaly bank (unusual in this formation) in which are several thin 

 layers of limestone, only one of which was found to contain 

 fossils. 



A 2 - 53 ft- Mostly covered. 

 * 15th Ann. Rept. N. Y. State Geologist, p. 645. 



