FEATURES OF TRAP EXTRUSIONS IN NEW JERSEY 327 



By an examination of the territory and a study of the structure of 

 the trap sheet we are able to define approximately the shape of the 

 area covered by the lake or lakes, 



I have outlined on the map a tentative boundary. The lake itself 

 seems a sufficiently distinctive feature of the ancient topography to 

 receive a specific name, and I have called it Lake Paterson, from the 

 locality where some of the most typical exposures are to be found/ 



I In the Transactions of the Geological Society of America for 1897 (Vol. VIII, pp. 

 59 £f.) Professor B. K. Emerson gives a detailed description of the occurrence of sand- 

 stone inclusions in the Connecticut valley traps, Mrhich have many points of similarity 

 to those of the New Jersey area. The theory by vrhich he accounts for their presence, 

 however, is, in some features, radically different from that offered here, chiefly in 

 that it is based upon a fundamental conception that the lava was a submarine flow, 

 covering the muddy bottom of a bay. While this may account for the features which 

 he describes in the New England area, I think that the explanation proposed in the 

 preceding pages will better account for the features of the trap sheet and for the rela- 

 tions of trap and sandstones in the New Jersey area. 



