J. F. Kemp — Porphyrite Bosses in JVew Jersey. 131 



from A2 to A3. The exposure in B2 is a large hill which, in 

 the words of the 1882 Report, p. 67, " rises very abruptly (33°) 

 from the meadow to a height of 150 feet." This is the one 

 on the farm of Mr. Rutan. Its outline viewed from the east 

 is reproduced from a photograph in the figure below the map. 

 The upper exposure in A5 is the one on the VanAuken farm 

 and consists of " two low hills." The lower exposure in A5 is 

 a low hill on the Howell farm. The westerly exposure in B5 



is on the Stiver farm and consists of " two other but abrupt 

 hillocks." The other four_are not especially referred to in the 

 report, but consist likewise of low hillocks or mounds. There 

 are other spots which have clearly been subjected to the action 

 of heat, but where no eruptive outcrop comes to the .surface. 

 The natural outcrops are not good and it is difficult to obtain 

 specimens in which alteration is not far advanced, except where 

 former prospect holes have been vainly sunk in the search for 

 the precious metals. The pyrites disseminations in the contact 

 shales have encouraged some such excavations. 



