26 NEW YORK STATE MUSEUM 



base is a bed of abundant small Prasoporas. It is important that 

 this Prasopora, forming here an horizon, has been recognized by 

 Doctor Ulrich as the lower Trenton Prasopora simu- 

 1 a t r ix . 



6 Directly above this bed Triarthrus becki begins 

 to be observed in considerable numbers and it continues to be the 

 common fossil through a considerable thickness. 



7 From 160-80 feet Triarthrus becki and Cory- 

 noides calicularis are the dominant fossils, while 



8 At 210 feet above base Lasiograptus eucharis 

 appears in great numbers and typical expression. It is associated 

 with: 



Triarthrus becki, and 

 Lingula curta 



This association was observed to the top (230 feet) approaching 

 which were found: 



Sphenothallus angustifolius Hall 1 (cc) 



Dalmanella testudinaria (Dalm.) (cc) 



Schizocrania filosa Hall (in large specimens) (c) 



Trocholites ammonius Hall (c) 



Orthoceras sp. (c) 



This congeries is typically that observed in the lower " Utica " 

 shale in the East Canada creek section at Dolgeville and it is nota- 

 ble that also the lithic character of the light drab weathering, blocky, 

 polygonal breaking, thick-bedded mud-shale is the same as that 

 prevailing in much of the lower parts of the shale at Dolgeville. 

 We consider it therefore probable that the top of this section is 

 equivalent to the lower part of the Dolgeville " Utica." 



In a new road cut between Flat creek and Canajoharie about 

 340 feet above base of " Utica," hard and thin-bedded black shale 

 was found, containing: 



Climacograptus spiniferus (filling one bed) (cc) 



Leptobolus insignis (c) 



Triarthrus becki (c) 



Another road cut 40 feet higher and to the north of the former 

 furnished again abundant : 



Climacograptus spiniferus (c) 



Diplograptus vespertinus 2 (cc) 



This shale is very strikingly dark and light banded. 



1 See Paleontologic notes, p. 74. 

 * See Paleontologic notes, p. 83. 



