PLEISTOCENE GEOLOGY OF MOOERS QUADRANGLE 39 



their attitude. There are certain lines of water level, for instance 

 that at about 500 feet between the English river and the west 

 branch of that river, which at first sight appear to be without 

 tilting. On going south of Wood Falls one finds the fragments 

 of a beach at practically the same level and again farther south- 

 east near the road from Sciota to Altona there is a large bar at 

 this level. But when the line is followed along the international 

 boundary, favorable slopes of the ground show equally good wave 

 marks going up to 540 feet. The beaches are not continuous. 



A conspicuous bar first noted by Dr Gilbert occurs at 450 feet 

 on Bovington brook near West Chazy, quite well enough formed 

 to have been made by strong waves in the sea, but it does not 

 appear to demand stronger wave action than that formed on the 

 fare of Cobblestone hill just west of it at a much higher eleva- 

 tion and undoubtedly by glacial lake waters. 



Lower series of beaches 



The lower series of beaches on the Mooers quadrangle comprise 

 those levels of former wave action which can be traced northward 

 beyond the limits of the map around the northern slope of Covey 

 hill in Canada. These wave marks are presumably marine. The 

 data from Covey hill beyond the northern limits of this area are 

 briefly presented in this paper under another heading. The high- 

 est level of clear wave action at that point is 450 feet above sea 

 level. On the Mooers quadrangle wave action is traceable on the 

 northern margin of the area in closely set ridges forming a dis- 

 tinct group from 540 feet down to 370 feet at the base of the hill 

 just east of Armstrong's bush. Eastward over the area, beaches 

 occur on exposed places, mainly low ridges or hillocks, at levels 

 from 350 feet down to 340 feet and again near Perry Mills at 250 

 feet (by the contour of the map) [pi. 15]. 



This group of beaches can be traced from the northern limits of 

 the map to the vicinity of the English river. Between the English 

 river and Bullis brook west of Sciota, recognizable beaches are 

 fewer and much less distinct as the accompanying map shows. 

 About a mile southeast from Wood Falls the highest beach seen 

 occurs at 500 feet according to the local contour by the map. 

 There is a bar [pi. 1G, 17] partly thrown across one of the head 

 branches of Bullis brook at this level. East of Bullis brook and 



