IGS NEW YOIIK STATE MUSEUM 



Chapter 7 



deltas and shore lines of the champlain 



valli:y 



The deltas of the Champlaiii vaHey have been studied by the 

 Vermont geologists and later by Taylor, G. F. Wright, Baldwin 

 and Ui)hani. The shore line phenomena of the New York side 

 particularly have received mention in the literature. Mr Gilbert 

 in his unpublished notes and Cushing in his report on local 

 geology api)ear to be the first to recognize their distinctness par- 

 ticularly in the northern part of the area where the valley is wider 

 and waves either of the sea or of a glaeial lake would have had a 

 greater fetch than in the southern constricted portion of the lake. 



From near Ticonderoga something like beaches begin to become 

 recognizable in favorable situations and gradually increase in size 

 and distinctness toward the northern part of the State till within 

 a few miles of the international boundary where they become 

 here and there striking objects. 



Space can be found for the description of types of these de- 

 posits only and then mainly the highest occurrences seen. 



Parallel roads on East Bouquet mountain. Immediately west 

 of Bouquet station on the Willsboro quadrangle rises East 

 Bouquet mountain, a rounded hill attaining an elevation of 1225 

 feet. On the northeast slopes of this hill signs of wave action are 

 traceable about halfway to the top. As nearly as I could estimate 

 my position on the uppermost of these marks by the contour lines 

 of the map, the highest of these wave lines is at 570 feet. The 

 plane of tilting between the highest wave marks on Trembleau 

 mountain and (he "Street Road highest beach cuts this hill at 500 

 feet, which is presumably a better reading than 570 feet [see 

 pi. 28 and explanation]. 



Port Douglas heach ridge. On the Willsboro quadrangle, south 

 of Trembleau mountain, a foothill of the Mt Bigelow mass is 

 formed by a relatively thick drift deposit in the form of a ridge 

 overlooking Corlear bay. The crest of this ridge, contoured to 540 

 feet on the United States Geological Survey map, is wave heaped 

 with subangular cobbles. This ridge must have formed an oifshore 

 bar or shoal when the waters stood at its hight over the Cham- 



