40 Geology of Hudson County, New Jersey. 



fied rocks are covered with debris, most of which has fallen 

 from the cliffs of trap that rise above. Just where the upland 

 that projects into the river, forming Day's Point, sweeps back 

 to meet the cliffs once more, the trap again comes down to 

 nearly the level of the Hudson. 



Three hundred yards farther north, are the extensive quarries 

 near the Weehawken ferry ; there is here a section of about 

 thirty feet of slates and sandstones exposed beneath the trap ; 

 at this locality fish-scales and the shells of a Cyj)ris have been 

 found in the slaty rock. 



Continuing northward, Ave find abundant exposures of the 

 sedimentary beds beneath the trap, the light-colored sandstones 

 coming in, however, more abundantly than before. 



Just north of Kohler and Sons' brewery, the "seven-story 

 brewery," by the side of a private road that leads to the 

 top of the hill, an irregular trap-dike is seen breaking through 

 the light-colored sandstone that forms the base of the cliff. 

 The dike is four feet thick, and composed of dark-bluish 

 fine-grained anamesite, showing an imperfect columnar struc- 

 ture at right angles to the walls of the fissure. 



All the way from Kohler and Sons' brewery to Bull's Ferry, 

 the lower twenty or thirty feet of the cliffs is composed of light 

 colored feldspathic sandstone, the seams in the rock sometimes 

 yielding specimens of dendritic manganese. 



At the village of Bull's Ferry, the trap forms a bold angle, and 

 seems to cut out the stratified beds once more, as at King's 

 Point. In the village the metamorphosed slates are again well 

 exposed, with all the characteristics seen at Weehawken. Just 

 north of Bull's Ferry the following section is shown — dip north- 

 west 15°. 



Trap-rock, .... 



Dark heavily-bedded slates. 

 Light-colored sandstone. 

 Dark evenly-bedded slates, somewhat 

 metamorphosed, - - - 



120 feet. 







45 



a 







6 



a 







30 



(( 



to 



river. 



201 



