1 



70 PROCEEDINGS OF THE SAINT LOUIS MEETING 



Maine to Texas and extending 100 miles back from tlie Atlantic coast, has 

 been made and submitted to the Council of National Defense. Geological sur- 

 veys and maps of the various cantonments are in course of preparation. The 

 special committee on war minerals, organized through the National Research 

 Council, has instituted and carried through surveys in various parts of the 

 country for emergency mineral supplies, and has summarized its work in the 

 form of a congressional bill recommending the appointment of a Minerals 

 Administrator, who shall have control of the entire mineral production of the 

 country. 



Other phases of the committee's work were referred to and its further 

 progress along various lines intimated. 



Presented in abstract from notes. 



Doctor Clarke was followed by Dr. Edward B. Mathews, who outlined 

 briefly what had been accomplished by the Geology Committee's Subcom- 

 mittee on Eoads. 



POSTGLACIAL UPLIFT OF NORTHEASTERN AMERICA 

 BY HERMAN L. FAIRCHILD 



(Abstract) 



Uplifted marine shores have been determined at many stations in Quebec, 

 New Brunswick. Nova Scotia, Maine, and New Hampshire during the past 

 field season. With the large amount of precise data distributed over the wide 

 area and the help from published observations of other geologists, it is now 

 possible to map with at least approximate truth the uplift of northeastern 

 America since the removal of the latest ice-sheet. The lines of equal uplift 

 (isobases) have been extended from the area of New York and western New 

 England, where long study has given definite knowledge. 



The criteria chiefly used for determination of summit water level are the 

 deltas, especially of south-flowing streams. The heavy, conspicuous deltas are 

 used for approximate levels, while deltas of small streams and other shore 

 features of the vicinity are relied on for more precise determination. Caution 

 is necessary to avoid confusion with glacial waters. 



It appears that the center of uplift lies between Quebec City and James Bay, 

 in amount over 1,000 feet. The amount of uplift found by Daly and others in 

 Newfoundland, with the position of isobases, confirms the opinion of former 

 students that the island, and perhaps Nova Scotia, were independent centers of 

 glaciation. The map suggests that the Mississippi Valley experienced some 

 uplift earlier than that recognized in the Michigan and Erie basins. 



Read in al^stract from manuscript. 



Discussion 



Mr. Frank Leverett called attention to evidence that the uplift may have 

 another dome west of James Bay. but he is not able to form any conclusions 

 as to its relation to ice weighting. 



