BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 18, pp. 505-556, PLS. 57-60 FEBRUARY 20, 1908 



COMPLEXITY OP THE GLACIAL PERIOD IN NORTH- 

 EASTEEN NEW ENGLAND* 



BY FEEDERICK G. CLAPP 



{Read in abstract before the Society December 29, 1906) 



CONTENTS 



Page 

 Introduction 507 



Literature concerning evidences of glacial complexity 507 



Fieldwork and acknowledgments 511 



Results 511 



Classes of evidence ■ 512 



Pleistocene succession 512 



Detailed descriptions 513 



Erosion of deep rock valleys 513 



Description 513 



Age of erosion 513 



Old tills 514 



General statement 514 



Exposure at South Norridgewock, Maine , 514 



Section at South Lawrence, Massachusetts 514 



Expos\ircs at I'ortland, ]Maine 515 



Other exposures 51G 



Correlations 51G 



Unconformity succeeding deposition of old tills 517 



( Jardiner clay 517 



General statement 517 



Relations and correlations 517 



Distinction from other clays 517 



Evidence afforded by fossils 518 



Stratified sand and gravel 519 



Principal till deposit (Montauk) 524 



General description 524 



Relation to other deposits 524 



Evidence that this till is not Wisconsin in age 524 



1. Tracing from Long island 525 



2. Relations to overlying clays 525 



• Published ty permission of the Director of the U. S. Geological Survey. 

 Manuscript received by the Secretary of the Society from the Censor July 0, 1007. 



XLV — Bull. Geol. Soc. Am., Vor.. IS, 1!»0C. (.iO.")) 



