562 PROCEEDINGS OF NEW YORK MEETING. 



The paper next in order was read by the author: 



THE [NTERNAL RELATIONS \ N I » TAXONOMY OF THE &.RCHEAN OF CEN- 

 TRAL CAM \l> A. 



BY A. C. I. LWSON. 



Owing tu tin' shortness of time left, there was no discussion on this 

 communication. It forms pages 175—194 of this volume. 



The next paper was read by title, and the author presents the following 

 abstract : 



■ >N THE INTRUSIVE ORIGIN OF THE WATCHUNG TRAPS OF NI.W JERSEY. 



BY KKANK L. NAmi.v. 



[Abstract.] 



The study of the Triassic sandstones of New Jersey by the state survey during the 

 summer of lsss resulted in the discovery or re-discovery of a trap conglomerate on 

 the northwest border of the formation. This trap conglomerate was found near Rfont- 

 ville and also at Jacksonville, three miles northeast, in heavy beds. This was at once 



imed t" be conclusive proof that the Watch ung trap- were of extrusiv "igin, and 



that the pebbles of trap came from these bills. 



Much as the late Dr. Cook was opposed to the extrusive theory, he considered this 



discovery to be the strongesl positive argument yet advan I by the upholders of the 



extrusive origin in support of th<-ir views. Hi- hope was that another source would 

 I..- found for the trap pebbles, and the question thus be left yet open, at the very least . 

 Field work during 1* s '" has disclosed the following facts : 



1. These trap bowlders have come from the northwest. The reasons for believing 

 this are that the pebbles are mingled freely with pebbles of gneiss and quartzite 

 and limestone. These formations ai n the northwest. 



2. The traps exposed on Towakhow, Second and First mountains, are amygdaloidal 

 and fine grained. The trap pebbles in the conglomerate are coarse grained, with ii" 

 trace of amygdules. 



The trap pebbles of the conglomerate have a greal abundance of quartz, while 



till. f the Watcbung mountains are almost free IY"in 'mart/.. Nimni'Mi- trap dikes 



in the Archean in the northwest, and near by, 'respond with the trap pebbles in 



being coarse grained and in having quartz. 



I. So tar a- is known, the conglomerates in the vicinity, Cushctunk, New German- 

 town mountains, and at Pampton Lake, are fr »f trap pebbles. These traps are all 



regarded as extrusive by the holders of this extrusive theory. It is held that the 

 facts above stated thus nullify any conclusions which otherwise would follow from 

 the presence of a trap conglomerate. 



5 The conglomerates which are made up wholly or in part of limestone, trap and 

 on the northwest border of the Trias, are but slightly conformable t" the gen- 

 eral Trias. This i ntrary to a statement in 1 1 • * - annual report of the state geologist 



for IH8S I mglomeratea have i •'■ the appearance of having been torrential 



