16 PROCEEDINGS OF MADISON MEETING. 



The third paper was : 



EXTRAMORAINIC DRIFT IN NEW JERSEY 

 BY G. FREDERICK WRIGHT 



In the discussion of the three foregoing papers remarks were made as 

 follows : 



T. C. Chamberlin : 



There is ground for congratulation in the large advance made by these papers 

 toward harmonious views concerning the extramorainic drift of the Delaware 

 region. A year ao;o the Professors Wright stoutly contended that a portion of the 

 drift now classified by them as glacial drift was of a residuary or other origin, and 

 vigorously antagonized the position previously taken by Professor Salisbury, who 

 contended that these formations were true glacial deposits. The maps now pre- 

 sented by the Professors Wright include the localities of High Bridge, Pattenburg 

 and others, which were specifically urged by Professor Salisbury as glacial forma- 

 tions, a view specifically opposed by the Professors Wright. The present mapping 

 includes all the localities that Professor Salisbury insisted were unquestionably of 

 glacial origin. There were certain other localities concerning which he reserved 

 opinion, and which are now regarded by all parties as requiring further investiga- 

 tion. So far, then, as the question of the extension of true glacial deposits beyond 

 the Belvedere moraine, there is substantial harmon5^ There remain two points of 

 difference : the first respecting the age of the extramorainic drift, and the second 

 relating to the connection and correlation of the Trenton gravels. Concerning the 

 age of the extramorainic drift, I think that a contribution has also been made to 

 the contention that it was much older than the Belvedere morine in the very fact 

 that the Professors Wright previously denied its glacial character at such localities 

 as High Bridge and Pattenburg, where it is thick and well exposed by railway 

 cuttings. The drift of the Belvedere moraine and that which lies north of it is 

 obviously very fresh and is very distinctly characterized as glacial. If the drift 

 outside of the moraine had not been very much older and its characteristics had 

 not been obscured by its age or by its different method of formation, they could 

 hardly be supposed to have failed to recognize its glacial origin ; nor could they be 

 supposed to have attributed it to residuary origin, because both residuary material 

 and residuary topography take on the characteristics of age from their very nature. 

 As to the second point, I venture to express the opinion that Professor G. F. 

 Wright's correlation of the Trenton gravel will prove to be erroneous. 



Warren Upham : 



On Long island an advance of the ice-sheet six miles south of the outermost 

 terminal moraine Is shown by the esker series forming the Manetto and Pine hills, 

 and by a second esker a few miles farther east, called the Halfway Hollow hills.* 

 These probably represent the same stage of ice-advance as the drift-fringe south of 

 the moraine in New Jersey and Pennsylvania. The fully oxidized condition of the 

 extramorainic drift seems attributable to its derivation chiefly from preglacial re- 



*Am. Jour, of Science, August, 1879. 



