TITLES AND ABSTRACTS OF PAPERS 73 



Prof. G. F. Wright: I have no occasion to differ from Professor Fairchild 

 when he giyes to Lake Ontario in its present dimensions an age of about 7,000 

 years, but I fail to see the evidence on v^hich he would extend indefinitely the 

 time occupied in the retreat of the ice so as to open the line of drainage for 

 Lake Iroquois through the Mohawk Valley and later through the Saint Law- 

 rence, and also that required for the elevation of the beach lines culminating 

 in the Saint Lawrence Valley and farther north. On the contrary, there is 

 abundant evidence that these movements went on with great relative rapidity 

 at the close of the Glacial period. 



With regard to Professor Coleman's statement that the rocky fragments in 

 the lowest till in the Don River Valley show that they have been transported 

 in the direction of the Labrador movement, I can only say that the evidence 

 is somewhat indeterminate, owing, first, to the fact that it is merely negative 

 evidence, since the limestone rocks transported may be found to have existed 

 farther west than he supposes ; or, again, that through early fluvial transpor- 

 tation fragments may have been carried in a westerly direction some distance 

 from their original position. But admitting that the deposits are all the re- 

 sult of the Labrador movement, there is still the same doubt respecting them 

 which we have already expressed with regard to the supposition that the 

 remains of warm species found in the interglacial deposits are of individuals 

 that actually lived there in interglacial time. I must again emphasize the 

 fact that the shells at Moel Tryfaen and Macclesfield are not all fragmentary 

 and are not contained in till, but in fluviatile and lacustrine beds connected 

 with the melting of the glacier. 



Further remarks were made by Mr. F. B. Taylor, and brief replies were 

 given by the two authors. 



The section adjourned at 4.45 o^clock p. m. 



The second section, having finished on Tuesday the papers on its pro- 

 gram, merged on Wednesday with the meeting of the Paleontological 

 Society. 



TITLES AND ABSTRACTS OF PAPERS PRESENTED BEFORE THE THIRD SECTION 

 AND DISCUSSIONS THEREON 



The third section met at 3.30 o'clock, with Vice-President James F. 

 Kemp in the chair and Frank E. Van Horn serving as secretary. 



MANGANESE DEPOSITS OF CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND 



BY NELSON C. DALE ^ 



{Abstract) 



At various places in Conception and Trinity bays of Newfoundland man- 

 ganese is found as a marine deposit interbedded with Lower Cambrian shales 



83 Introduced by Gilbert van Ingen. 



