BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 28, pp. 279-308, PLS. 10-11 JUNE 9, 1917 



•OST-GLACIAL MARINE SUBMERGENCE OF LONG ISLAND 



BY HERMAN L. FAIROHILD 



{Presented before the Society December 28, 1916) 



>so«»i 



J/ DEC 



CONTENTS \ A/ 



^% ^ 



Introduction. -^^'Ul W 



Historical review 281 



Description of the plain 284 



Subaerial o^twash 286 



Tlie submarine plain ., 288 



Proofs of submergence 288 



Evidence from the Hudson ^'alley 288 



Evidence from the Connecticut Valley 292 



Shorelines of the inner edge 293 



Smoothness of the plain 294 



Surficial loams 295 



Submerged moraines 29G 



Kettle plains 297 



Stratified sands containing boulders , 298 



Equivocal features .- , 299 



Absence of beaches 299 



Absence of marine fossils 302 



Creases on -the plain 303 



Explanation of map and isobases , 304 



Summary 306 



Bibliography 307 



Introduction^ 



Perhaps more than any other equal area in America, Long Island has 

 been the snhject of indecisive geologic stndy and lively disputation. For 

 over a century it has afforded the students of stratigraphic and surficial 

 geology an opportunity for difficult diagnosis, and the complex features 

 have been attacked from every position of geologic philosophy. But the 

 problem has outrun the investigation. The preglacial deposits are 

 thought to have been overridden, disturbed, and confused by the recur- 



^ Manuscript received by the Secretary of the Society December 26, 1916. 



XX — Bull. Geol. Soc. Am., Vol. 28, 1916 (279) 



