BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 1, pp. 501-516. April 29, 1890 



THE CALCIFEROL!* FORMATION IN THE CHAMPLAIN 



VALLEY. 



BY EZRA BRAINARD AND HENRY M. SEELY. 

 [Read before the Society December 27, 1889.) 



CONTENTS. 



Page. 



Introduction 501 



The Formation in General 502 



Definition 502 



Thickness, Variety, and Faunal "Wealth 502 



Principal Divisions 503 



Sections 505 



East Shoreham Section 506 



Shoreham Center Section 506 



Orwell Section 506 



Fort Ticonderoga Section 506 



Southeast Charlotte Section 507 



Providence Island Section ._ 507 



The Fort Cassin Strata 507 



The Canadian Exposures 508 



Misapprehensions Corrected 508 



Recapitulation and Suggestions 509 



Discussion 512 



The Fort Cassin Rocks and their Fauna: Bv R. P. Whitfield 514 



Introduction. 



The region which we have under investigation, lying between the Green 

 mountains on the east and the Archeau heights on the west, and extending 

 from Benson, Vermont, and Ticonderoga, New York, on the south, to Phil- 

 lipsburgh, Canada, on the north, has a breadth of about twenty miles and a 

 length of not far from eighty. 



Near the western side of this geological cradle lies Lake Champlain, with 

 its islands. On the Vermont side, east of the lake, all the rocks of the Lower 

 Silurian series appear — Potsdam, Calciferous, Chazy, Black River, Trenton, 

 and Utica slate. These rocks sometimes lie in their natural order, fQrming 



LXVII— Bum,. Geol. Soc. Am., Vol. 1. 1880. ( r >01) 



