462 I'ROCEEDINGS OF THE NEW YOllK MEETING 



variably charactoriKtic of Lower Trenton in the Ottawa valley near Ottawa, and 

 Zygospira recurviroslra was found abundantly in the uppermost beds of this forma- 

 tion. So also in the case of Cerdrans jilarcxdnlJiemuf;, this trilobite occupies the 

 basal beds of the Utica, at Ottawa; but occurs low down in the Trenton of the 

 lake Champlain district. 



The lacuna existing at the interval of transition from the Trenton to the Utica 

 terranes along lake Champlain is unfortunate, as everywhere in the Ottawa and 

 Saint Lawrence valleys, in Canada and in Ontario east of Toronto, these two for- 

 mations pass imperceptibly one into the other. Along the Rideau river, at 

 Ottawa, at Rochesterville, and in numerous other localities in the vicinity of 

 Ottawa, the pyroschists of the Utica or bituminous shale follow directly upon the 

 Trenton without any discordance of stratification whatever. The enormous thick- 

 ness assigned to the Utica, of upward of 500 feet, was surprising, for the whole of 

 the Utica formation at Ottawa is scarcely more than 75 feet in thickness. 



In the absence of the authors, the next two papers were read by title. 



STRATIGRAPHY OF THE POTTSVILLE SERIES IN KENTUCKY 



BY MARIUS K. CAMPBELL 



AMERICAN HOMOTAXIAL EQUIVALENTS OF THE ORIGINAL PERMIAN 



BY CHARLES R. KEYES 



The following paper was then read : 



THE NEWARK SYSTEM IN NEW YORK AND NEW JERSEY 

 BY HENRY B. KtJMMEL 



Remarks were made by the chairman, by N. S. Shaler, I. C. Russell, 

 J. E. Wolff, A. Heilprin, J. B. Woodworth, and the author. The paper 

 is published in the Journal of Geography, volume vii, 1899, pages 23-52. 



The two following papers were read and, without discussion, closed 

 the afternoon session : 



JURASSIC FORMATIONS OF THE BLACK HILLS OF SOUTH DAKOTA 

 BY N. H. DARTON 



This paper is printed as pages 383-396 of this volume, with description 

 and illustrations of the fossils by Dr Charles R. Eastman, which also 

 appears as pages 397-408 under the title " Jurassic Fishes from Black 

 Hills of South Dakota." 



MESOZOIC STRATIGRAPHY IN SOUTHEASTERN BLACK HILLS 

 BY N. H. DARTON 



The Society adjourned. No evening session was held, the Fellows 

 being invited to a reception tendered the several societies meeting at th^ 



