(reologij of Hudson County, Xcw Jersey. 



39 



Trap 



to 



Top of Cliff, 



150 ft. ' 



Fig. 1. — Sectiox as exposed in the face of the Cliff xear 

 THE Duel GroujsD, Weehawken. 



Tlie trap forming the small sheet 

 at the base of the clilf, like that at 

 the base of the main trap-slieet above, 

 is a dark-bluish, fine-grained aname- 

 site, breaking with a conchoidal frac- 

 ture. The four-feet stratum of ti'ap 

 can be traced northward about seven- 

 ty yards, when the dip of the rocks 

 carries it below the surface. 



Tracing the stratified rocks about 

 150 yards farther north, we find them 

 somewhat disturbed from their nor- 

 mal position and dipping 30° — 35° 

 northwest; a fewyards further on they 

 are inclined to the southwest, and a 

 bed of trap four feet thick comes in ; 

 this trap is like the first thin bed, is 

 dark-bluish, fine-grained, and yellow 

 on the weathered surface; it is exposed 

 for only a few feet, and is then covered with debris. 



About thirty feet above the river, at the point where the 

 sandstones begin to widen out at the base of the cliff to form 

 Day's Point, a division of the trap-sheet is exposed in the face 

 of the clifE, as represented in the following section. 



Fig. 2. — SECTioisr exposed in the Cliffs at Weehawken. 



Metamorphos- 

 ed Slate, 

 40, /I 



Traj}, 41 in. 

 Slate, 6 ft. 

 Debris. 

 Hudson River. 



The stratified rocks 

 are here of the same 

 nature as in the pre- 

 vious section, and all 

 are very much alter- 

 ed by heat. 



From this point, go- 

 ing northward along 

 the banks of the 

 Hudson, the strati- 



Trap to top of 

 Cliff. 



Included meta- 

 morphosed 

 Slate, 15 ft. 



Trap 5 feet. 

 Metamorphosed 

 Slateio Hudson. 



