ELIZABETHTOWN AND PORT HENRY QUADRANGLES 73 



As the most characteristic fossils of the Black River group 

 in this locality are cited by Raymond: 



Maclurites logani Salter 

 Plectorthis plicatella Hall 

 Strophomena incurvata Shepard 

 Leperditia fabtilites Conrad 



Zygospira recurvirostris Hall 

 Stromatocerium rugosum Hall 

 Columnaria alveolata Goldfuss'^ 



We have also observed some of the cephalopods so characteristic 

 of the Black River beds at Watertown, notably Hormoceras 

 t e n u i f i 1 u m and Plectoceras sp. (probably undatus ). 

 They were associated with Tetradium cellulosum and 

 Orthoceras rectiannulatum, two typical Lowville 

 fossils at Watertown but they appear also in the Watertown region 

 already in the Lowville beds. 



The lithologic characters of the Black River rocks at Crown 

 point and in the Westport area are for the most part strikingly 

 like those of the Watertown limestone at Watertown, in the fineness 

 of the grain, the dark color and fine veining as well as the peculiar 

 small blocky weathering. 



In the Westport area the belt of Black River limestone begins 

 at Mullen bay as indicated by a big angular boulder that has ob- 

 viously been transported but a short distance and contains a large 

 colony of Columnaria Phalli.^ The belt strikes thence 

 north-northwestward in the direction of Beaver creek and is ex- 

 posed in two places in the creek bed, at one of which large speci- 

 mens of Maclurites logani and of Stromatocerium can be 

 seen. 



Trenton limestone. Only the lower portion of the Trenton 

 limestone is exposed in either the Westport area or Crown Point 

 peninsula and this consists in both localities of thin bedded, slabby, 

 mostly impure, very fossiliferous limestone with shaly partings. 

 On the Crown Point peninsula there are 88 feet exposed, the re- 

 mainder of the formation, which on the opposite shore in Vermont 

 attains 314 feet, being hidden under the waters of Bulwagga bay. 

 Raymond has distinguished several fossil zones in the Trenton, the 

 lowest one of which is that of Raphistoma lenticulare 

 comprising 4 feet 9 inches, separated from the Black River by a 

 covered interval of 4 feet. It is followed by the Parastrophia 



1 As pointed out by Nicholson [Palaeozoic Tabulate Corrals, 1879, P- 200], 

 Winchell and Schuchert [Geol. Minnesota, v. 3, pt i, 1895, p. 85], the 

 Columnaria alveolata of American authors is not identical with 

 Goldfuss's species and should be known as Columnaria ? h a 1 li 

 Nicholson. 



