188 T. C. Chamberlin — Diversity of the Glacial Period. 



formations. This petrographic variety, taken in connection 

 with Prof. Smock's opinion, seems to be a sufficient answer to 

 the claim that there is no foreign material in the cuts. 



As a collateral point, Professor Wright asserts that " South 

 of Musconetcong Mountain stretch the Triassic red shales which 

 cover so much of the central part of New Jersey. But in 

 this portion of the State, there has been absolutely no trans- 

 portation of northern material out upon the Triassic shales, 

 showing that no movement here ever passed the Musconetcong 

 Mountain" (pp. 365-6). Drift lying upon the Triassic shales 

 is reported to occur at the following points by the following 

 observers : 



1. West and N.W. of Pittstown. A. R. Whitson. 



2. Hensfoot. H. B. Kummel. 



3. Pattenburg. R. D. Salisbury, C. E. Peet and H. B. Kummel. 



4. South of White House Station. A. R, Whitson. 



5. North (L+ or 2 miles) of Somerville. F. C. Schrader and 



R. D. Salisbury. 



6. New Brunswick. C. E. Peet, R. D. Salisbury. 



7. Liberty Corners. F. C. Schrader, R. D. Salisbury. 



8. Berkley Heights. A. R. Whitson, R. D. Salisbury. 



9. New Vernon. R. D. Salisbury. 



10. Bernardsville. F. C. Schrader, R. D. Salisbury. 



11. Basking Ridge. R. D. Salisbury, F. C. Schrader. 



It is not affirmed that all these are direct glacier deposits, 

 but they are identified as drift and other than obvious valley 

 drift. Of these, the Pattenburg and Hensfoot deposits and 

 the area near Pittstown lie south of Musconetcong Mountain 

 and fall directly within the territory alleged to be barren. 

 The remaining localities lie to the east of this, and while they 

 do not come within the strict limits of Professor Wright's 

 statement they bear on the general question involved. Of 

 these localities, all, or nearly all, lie in such topographical 

 situations as to absolutely exclude the interpretation placed 

 upon the High Bridge and Pattenburg deposits by Professor 

 Wright, 



It appears, therefore, that he has based his assumed demon- 

 stration, first, upon a general proposition that experience has 

 shown to be entirely inadmissible ; secondly, upon the absence 

 of foreign material at High Bridge and Pattenburg when the 

 specimens gathered by a young geologist sent there merely to 

 make a representative collection embrace a large variety of 

 rock specimens unrepresented by formations in the vicinity 

 and referred by Professor Smock to distant terranes ; and 

 thirdly, upon an assertion, in the most positive terms, of the 

 absence of drift on the Triassic areas south of Musconetcong 

 Mountain, when such drift is found there by other observers. 



