44 ' NEW YORK STATE MUSEUM 



1 



or elsewhere. Evidences of wave-work can be found up and down 

 the valley at all levels, but water planes can not be postulated on 

 a few detached features. Bar-building and cliff-erosion are con- 

 trolled by variable factors, and except for strong and continuous 

 beaches or through long distances the inscriptions are not reliable 

 for levels. Of course it is probable that the rise of the land was not 

 perfectly uniform, but there were no pauses long enough to pro- 

 duce distinct shores for any distance in the Hudson and Cham- 

 plain valleys. 



With reference to the assumed outlet or control of " Lake Ver- 

 mont " at the divide northeast of Fort Edward, there is something 

 more to be said. It appears that 200 feet of uplift had taken place 

 at Round lake at the time Covey outlet became effective, and the 

 ice front lay on Covey hill (see page 39). The divide is 31 miles 

 farther north than Round lake, by isobases, and it should have 

 been later in its uplifting. But even assuming that it did rise in 

 company with Round lake, the 200 feet of uplift would have left 

 it yet 100 feet under the sea (see page 40). And it is not reason- 

 able to suppose that it rose the other 100 feet during the relatively 

 short time that Covey outlet was effective. 



It is possible that the divide rose 300 feet and was out of water, 

 or above sea level, when the Champlain waters were permitted to 

 mingle with the salt water of St Lawrence gulf. 



In the valley of Lake George the shore features have not been 

 seriously examined, but the proofs of standing water at various 

 levels are evident. Theoretically, the highest levels should corre- 

 late with the outlet toward Luzerne, 760 feet. With some allow- 

 ance for depth oif water in the outlet it makes the water level at 

 Caldwell about 780 feet, or some 460 feet over the present lake. 

 At Ticonderoga the plane would be about 860 feet, or some 540 

 over the lake. The pass west of French mountain gave an outlet 

 185 feet lowxr. The marine plane is about 115 feet below the 

 second glacial plane. The marine plane is estimated to lie at about 

 470 feet at Caldwell and 545 at Ticonderoga. It is for future 

 students to verify and correct these three planes in the George 

 valley. 



Port Henry quadrangle. The most striking feature on the map 

 is the vast clay plain east of the lake, with the Dead creek, repre- 

 senting the later work of the receding marine waters. 



Snake mountain stood as an island in all the sea-level waters, 

 and distinct summit shore features will doubtless reward careful 

 search. With this wave-beaten height we take leave of shore fea- 



