REPORT OF THE DIRECTOR I9II 



35 



Altona stream flow at high levels, so that no great volume of water 

 ever fell through the vertical interval from Iroquois (looo) to 

 Emmons (750). 



When the ice barrier was removed in the Altona district Lake 

 Emmons was lowered into Lake Vermont, and the latter lake in its 

 turn occupied the St Lawrence and Ontario valleys. This expanded 

 lake will be called V ennont-N ew York. Its deltas are broad on the 

 Grass, Raquette, St Regis, Salmon and Chateaugay rivers, and 

 Chadwick has found some good, shore line features. 



Eventually the ice sheet weaTkened on the Vermont side of the 

 Champlain embayment and Lake Vermont-New York was drained 

 down to sea level and oceafiic waters took possession of the Cham- 

 plain, St Lawrence and Ontario valleys at the same time. 



The Covey gulf outlet of Iroquois to have been effective must 

 have been at least as low as the Rome outlet, but now it is 565 feet 

 higher. The postmarine uplift at Covey hill, that is since the ocean 

 was admitted there, is definitely 525 feet according to the figures of 

 the Canadian topographic map. This excess of at least 40 feet 

 submergence represents the amount of uplifting of the district dur- 

 ing the interval of time between the extinction of the Covey gulf 

 river and the construction of the earliest marine beaches. This 

 interval covers the duration of the downdraining of Iroquois to 

 Emmons and the periods of life and downdraining of Emmons and 

 Vermont-New York. It would appear that this interval was only a 

 small fraction of post-Iroquois time. 



The vertical interval between the shore lines diminishes south- 

 ward along with the altitudes. For the St Lawrence valley the 

 altitudes and intervals are given approximately, in the following 

 table, subject to future correction. 



Comparison of shore lines in the St Lawrence valley 



LAKE 



COVEY HILL 



PARISHVILLE- 

 POTSDAM 



FULLERVILLE- 

 GOUVERNEUR 1 



WATERTOWN 





Altitude 



Interval 



Altitude 



Interval 



Altitude 



Interval 



Altitude 



Interval 



Iroquois 



Emmons 



Vermont-New York 

 Oceanic 



I 025 

 750 

 650 

 525 



275 

 100 

 125 



920 

 695 

 600 

 480 



225 



95 



120 



815 

 632 



545 

 435 



183 



87 



no 



733 

 (580) 

 (500) 



400 



(153) 

 (80) 



(lOO) 



Total interval. . 





500 





440 





380 





3,^3 



1 The figures for the Fullerville-Gouverneur section and those in parentheses are calculated and 

 theoretical. 



INDUSTRIAL GEOLOGY 

 Building stone. During the past field season an inspection 

 of the quarry localities was undertaken by the assistant state geolo- 

 gist with the aid of Mr R. W. Jones of the staff. It was found 



