128 PROCEEDINGS OF THE BOSTON MEETING 



EXTENT AND THICKNESS OF THE LABRADOR ICE-SHEET 

 BY A. P. COLEMAN 



» {Abstract) 



It is sliown that the Labrador ice-sheet did not cover some thousands of 

 square miles in the northeast of Labrador and did not cross the Shickshock 

 Mountains in Gaspe. Estimates are formed of its thickness at certain points 

 and conclusions are drawn as to the bearing of these facts on the theory of 

 isostasy. 



Presented without notes and illustrated with lantern slides. 



D RUM LIN S AT LAKE PLACID 

 BY WARREN UPHAM 



(Abstract) 



In a visit last summer at Lake Placid, in the central part of the Adirondack 

 Mountains, my observations of the glacial drift included the mapping of a 

 group of a dozen drumlins, a phase of till accumulation not previously re- 

 ported in that region. These smoothly oval drift hills, from 50 feet to nearly 

 150 feet in height above the adjacent Mirror Lake and Lake Placid, occupy 

 much of the area of Lake Placid village and the extensive grounds of the 

 Lake Placid Club. Westward they are prominent one to two miles from this 

 village, beside and south of the roads leading to Saranac Lake, Their absence 

 around Saranac Lake and generally throughout the region of the Adirondacks, 

 with their elevation, 1,900 to 2,000 feet above the sea, give to this group ex- 

 ceptional significance in its testimony concerning the conditions and time of 

 formation of this class of drift deposits. 



Signal Hill, between the southern arm of Lake Placid and the northwest 

 side of Mirror Lake, is a typical drumlin, its graceful outline being well seen 

 as it is approached on the steamer cruise around the former lake. Thence a 

 series of similarly massive drumlins continues a mile southward, forming a 

 connected ridge a third to a half of a mile wide. From the rounded summit 

 of Signal Hill a descent of about 15 feet is made before rising to the next 

 broad hilltop, which may be named Stevens Hill for its large summer hotel, 

 the Stevens House, On the nearly level top of the most southern drumlin in 

 this series is another great hotel, the Grand View House, opposite to the south 

 end of Mirror Lake, 



The altitude of Lake Placid, as stated in a note beneath its topographic 

 map for the United States Geological Survey, is 1,859 feet above the sea, A 

 narrow and flat tract of modified drift, 5 to 10 feet above this lake, adjoins 

 the eastern foot of Signal Hill, separating Lake Placid from Mirror Lake, the 

 latter having an altitude of 1,857 feet. Above these lakes the drumlins thus 

 described attain heights of about 120 to 135 feet. Signal Hill being noted as 

 1,981 feet above the sea. Stevens Hill is estimated as 1,990 feet; the depres- 

 sion next south, 1,960 feet ; the third drumlin summit, 1,975 feet ; next a de- 

 pression to 1,965 feet; and the Grand View Hill, 1,980 feet. The principal 

 street of Lake Placid village, parallel with the Mirror Lake shore, extends 



