PLEISTOCENE MARINE SUBMERGENCE 



Bar Succession 



57 



NUMBER 

 OF BARS 



HORIZON- 

 TAL 

 DISTANCE, 

 IN MILES 



VERTICAL 



RANGE, IN 



FEET 



AVERAGE 



INTERVAL, 



IN FEET 



GREATEST 



SINGLE 



INTERVAL 



IN FEET 



Irish School 



Armstrong's Bush 



North of Cannon Corners 

 Cannon Corners School . . 



Shelters Corners 



Beartown 



Peru 



Franklin Center 



StocVwell P. O 



Covey Hill P. O. north. . . 

 Covey Hill P. O., east. . . 



South of boundary 



Basset road 



Bars of the marine suinmit 



40 (730-690) 

 20 (730-710) 

 20 (725-705) 

 25 (730-705) 

 120 (700-580) 

 115 (684-569) 

 80 (590-510) 



Bars of the Franklin Center series 



1X2 (525-413) 

 135 (Sio-375) 

 210 (530-320) 

 131 (523-392) 

 160 (525-365) 

 100 (500-400) 



10 (middle) 



10 (at top) 



10 (at bottom) 



23 (at bottom) 

 13 (at top) 



Bar succession. The above tabulation clearly proves that 

 the production of embankments or bars along shore lines is not 

 wholly a function of duration, or length of time for wave work at 

 a fixed level, but that it depends on a combination of physical shore 

 conditions. Chief of these factors is an abundance of coarse 

 material, as boulders and cobble, which the waves can throw beyond 

 their future grasp. This is proved by the large development of 

 bars on cobble deltas and their absence at the same level, in near 

 localities, on sandy tracts. Other evident conditions must be suffi- 

 cient breadth and depth of water for efficient waves and shore cur- 

 rents, and favorable shore topography for piling the detritus. 



The succession of bars with close spacing through large vertical 

 range can not be produced in water of fixed level, in relation to the 

 land, nor in rising levels. They are the product of slow and steadily 

 falling levels. Marginal glacial lakes do not have the requisite 

 conditions. The series of bars shown in the accompanying maps, 

 for Lake Iroquois and the sea-level waters, can be constructed only 

 by the slow uplift of the land out of the waters. 



St Lawrence Valley 



Chateaugay quadrangle. The striking feature of this map (plate 

 5) is the Iroquois shore line with its correlating glacial drainage 

 channels (plate 22). This is well marked by deltas an dweak bars, 

 but fading northeastward on the Churubusco and Canadian sheets 

 toward the second outlet at Covey pass. In this district the marine 



