BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 28, pp. 543-552, PLS. 36-42 SEPTEMBER 21, 1917 



DATE OF LOCAL GLACIATION m THE WHITE, ADIEOJST- 

 DACK, AND CAT SKILL MOUNTAINS ^ 



BY DOUGLAS WILSON JOHNSON" 



(Read hefore the Society December 27, 1916) 



CONTENTS 



Page 



Introduction 543 



The problem stated 543 



Evidence derived from the White Mountain cirques 544 



Date of cirque-cutting in the Adirondack Mountains. 547 



Date of cirque-cutting in the Catskill Mountains 549 



Conclusion 551 



References 551 



Introduction 



The student of land forms finds in the White Mountains of New Hamp- 

 shire exceptional opportunities for pleasant and profitable field excursions. 

 To the advantages afforded by Prof. J. W. Goldthwait^s excellent descrip- 

 tions of the salient topographic features of the Presidential Eange are 

 added ease of accessibility to all parts of the mountains over trails con- 

 structed by the Appalachian Mountain Club, and the existence of an 

 expressive contour map prepared by Mr. Louis F. Cutter. 



During a short visit to the region in the summer of 1914 I enjoyed 

 still further advantages through the courtesy of Prof. W. 0. Crosby, who 

 not only provided excursions to different parts of the range in his auto- 

 mobile, but also joined me on tramping trips over the highest peaks for 

 the purpose of discussing in the field points open to debate. Let me here 

 record my indebtedness for many valuable suggestions received in the 

 course of these discussions. 



The Problem stated 



According to Goldthwait's descriptions, the Presidential Eange repre- 

 sents a complex mountainous mass, which was first reduced by normal 



1 Manuscript received by the Secretary of the Society May 4, 1917, 



XLI— Bull. Geol. Soc. Am., Vol. 28, 1916 ' (543) 



