BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 18, pp. 195-210, pls. 1-2 May 16, 1907 



STEUCTURE AND COREELATION OF NEWARK TRAP ROCKS 



OF NEW JERSEY* 



BY J. VOLNEY LEWIS 



{Presented by title before the Society December 29, 1906) 



CONTENTS 



Page 



Summary 195 



Introduction 196 



Area of the Newark system , 196 



Topography 196 



Characters of the sedimentary rocks 197 



Structures of the Newark 197 



Dip and strike 197 



Folds 198 



Faults 199 



The trap rocks 199 



Modes of occurrence 199 



Relations of the extrusive traps , 200 



General characteristics 200 



First mountain 200 



The double flow of Second mountain 200 



Third mountain, or Long hill 202 



The New Vernon trap 203 



Sand Brook and New Germantown traps 203 



Relations of the intrusive traps 204 



General characteristics 204 



The Palisades sill 204 



Extension of the Palisades sill 205 



Offshoots of the Palisades sill 207 



The trap of Cushetunk and Round mountains 208 



Age of the extrusives 209 



Age of the intrusives 209 



Summary 



In addition to the structures and relations heretofore recognized, the 

 following conclusions are presented in this paper : 



(1) That the trap of Second Watchung mountain is a double flow, 

 separated locally by sediments deposited on a warped surface. 



* Published by permission of the State Geologist of New Jei-sey. Manuscript received 

 by the Secretary of the Society March 8, 1907. 



XV — Bull. Geol. Soc. Am., Vol. 18, 1906 (195) 



