ANCIENT WATER LEVELS OF CHAM PLAIN— HUDSON VALLEYS 211 



level line of unconformable com act with overlying sands and 

 clayey sands from 3 to 5 feet thick, in which near the base occur 

 marine fossils. Overlying this bed are coarse waterworn gravels 

 believed to be laid down by the river when its bed there was the 

 top of the terrace now 310 feet above sea level. The following 

 species were collected. 



Macoma groenlandica .... 



Saxicava rugosa 



Leda arctica 



Yoldia (Portlandia) sp... 

 Balanus sp. fragments.. 



Saxicava rugosa, Leda, etc. are in the lower clayey bed 

 usually intact and in the attitude of growth. 



This locality is close to the 340 foot contour line of the United 

 States Geological Survey map. Similar sands and clays are seen 

 on the north side of the river below the bend at a point north of 

 the camp meeting ground. The shell-bearing deposits are in 

 strong contrast with the coarse wave and river strewn materials 

 indicating the recession of the sea, and evidently pertain to the 

 maximum marine stage following the disappearance of the ice 

 from the locality. The smooth surface of the till on which the 

 deposits rest and the apparent absence of beds referable to a 

 lacustrine stage are rather characteristic of the marine series at 

 this level from the Saranac northward. The same smoothness of 

 the inclined surface of the till in the Saranac section at Freyden- 

 burg's Mills is noted below. 



Fossils at Frcjjdrnbiirffs Mills on the Saranac. This locality, 

 first noted, I believe, by Dr D. S. Kellogg and S. P. Baldwin, is 

 one of the highest localities of marine shells on the New York side 

 of the Champlain valley. The section as exposed in 1901 along 

 the tracks of the Chateaugay Railroad reveals gravels and sands 

 anconformably overlying the boulder clay. The till is a com- 

 part unstra titled mass composed of bluish clay and clean, well 

 striated boulders. Xo traces whatever were seen of the fossil 

 shells in this lower glacial deposit. The surface of the till was 



dominant 

 not rare 



rare 



f J. W. Dawson. Canad. Ice Age. 

 1 p. 241-2 



Verrill. Invert. Anim. Vineyard 

 [ Sound, p. 689 



