BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 27, PP. 235-262, PLS. 10-12 JUNE 1, 1916 



PLEISTOCENE UPLIFT OP NEW YOEK AND ADJACENT 



TEKKITOKY 1 



BY HERMAN L. FAIRCHILD 



(Read before the Society December 29, 1915) 



CONTENTS 



Page 



General statement 235 



Isobases 237 



Marine plane 240 



Iroquois plane , 242 



Altitudes and warping in the Ontario basin 243 



Outlet control — splitting of beaches 245 



Flooding of the south shore of Iroquois 247 



Checks and proofs 248 



Relation of land uplift to the ice-body 249 



Comparison of maps ' 253 



Conclusion and summary 254 



Bibliography 255 



Postscript 262 



General Statement 



In 1913 the writer published (see number 127 of the bibliography) 

 evidence and argument to prove the deep submergence of the Connecticut 

 and Hudson-Champlain valleys and indicated by a map the approximate 

 amount of postglacial uplift. It was shown that the marine plane, repre- 

 sented by a wealth of shore phenomena, rises from zero below New York 

 City to over 700 feet on the Canadian boundary, and that the isobases are 

 inclined 20° from the latitude parallels, running north of west by south 

 of east. In other words, the direction of steepest npslope is north 20° 

 east. The determination of these directions was made by connecting 

 points of equal altitude on the marine plane in the Hudson and the Con- 

 necticut valleys, and with no regard to any previous work or writing on 

 land deformation. It is significant, therefore, to note that Professor 

 Coleman found the direction of greatest uplift of the Iroquois plane in 



1 Manuscript received by the Secretary of the Society January 7, 1916. 



(235) 



