BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 2, pp. 541-586 July 2, 1891 



A PROPOSED SYSTEM OF CHRONOLOGIC CARTOGRAPHY 

 ON A PHYSIOGRAPHIC BASIS. 



BY PRESIDENT T. C. CHAMBERLIN. 



THE GEOLOGICAL DATES OF ORIGIN OF CERTAIN TOPO- 

 GRAPHIC FORMS ON THE ATLANTIC SLOPE 

 OF THE UNITED STATES. 



BY WILLIAM MORRIS DAVIS. 



CONTENTS. 



Page. 

 A proposed System of chronologic Cartography on a physiographic Basis ; by 

 T. C. Chamberlin 542 



The Geological Dates of Origin of certain Topographic Forms on the Atlantic 



Slope of the United States 545 



Introductory Note 545 



The Classification of Topographic Forms according to Age or Degree of De- 

 velopment 545 



Basis of Classification 545 



Factors controlling Topographic Development 546 



"Age" and "Date" of Topographic Forms 547 



The Topographic Forms of the Atlantic Slope 548 



Outline of this Essay 548 



The resurrected pre-Triassic Peneplain in southern New England 549 



The uplifted Cretaceous Peneplain in southern New England 549 



The uplifted Cretaceous Peneplain in the New Jersey Highlands 552 



The geological Date of the Completion of the New Jersey Penephiin 554 



Evidence from the Palisades of the Hudson 556 



Subaerial, not marine, Denudation produced the Peneplain 557 



Inland Extension of the Cretaceous Formation 558 



Extension of the Cretaceous Peneplain west and southwest of New 



Jersey 559 



The Tertiary Elevation of the Cretaceous Peneplain 564 



Altitude of the interior Portion of the Peneplain 565 



LXXX-BuLL. GEon. Soc. Am.. Voi,. 2, 1890. (541) 



