THE ELLIS MILLS DRAINAGE. 5fi9 



and the character of tlie Ijottom of this vallev. with tlic -^rcat cskcr, oiilv 

 half covered, wiuduig- down its middle at a iiuich Idwn- level, shows that 

 the valley can not have heen filled to the (i-JO-foot level and tlieii reexca- 

 vated, hut that the work of filling- the lake wa.s arrested at this point hv 

 the further recession of the ice that opened at a lower level tlu^ gor<>-e 

 which forms the continuation of the Palmer ^'allev eastward, and which I 

 have called above the Ellis Mills Valley. During the contiimation <>( this 

 lake its waters escaped through the Monson Vallev to the south and did 

 not quite plane the sands accumulated there down tu the Unci of the jiass 

 across the whole valley, as a central channel cut in the sands ]»asses l)e\dnd 

 the headwaters of M(msou Brook at the State line and is dccupied farther 

 south, heyond the divide, by the headwaters of the Willimantic. 



THE ELLIS MILLS DRAINAGE. 

 THK I'ALJIER LAKE. 



As the ice retreated westward a next important halting place (h*, 

 PI. XXXV, D) is suggested by the configuration of the country and by 

 heavy morainic accumulations. Here the ice abutted against the high hills 

 east of Bonds village, against Hog Hill, surrounded Mount Dumpling, and 

 for a time still closed the passage between Mount Dum])ling and Bald Peak. 

 During this time the Ware River Valley was freed from ice and filled with 

 a great volume of sand, and the beds at the 530-foot level (1 p a), extending 

 north from Palmer east of Thorndyke and Bonds village, Avere laid down, 

 the latter by waters coming from the lower Swift River A'allev. 



The establishment of this level for so long a distance may mean onlv 

 that the time did not suffice to fill to the 620-foot level the area newlv left 

 by the ice, and that the drainage was still south across Monson. I ha\-e 

 assumed that the outlet was south across Palmer and then west, by the 

 breaching of the south end of the barrier (b*), and around the north foot 

 of Bald Peak into the Ellis Mills Valley, perhaps carried along the north 

 slope of Bald Peak and held up to 530 feet by the ice. 



THE WARE AND SWIFT RIVER LAKES. 



It seems quite plain, however, that a more effective washout occurred 

 when the ice barrier (b*) yielded just south of Mount Dum])liiig and all 

 the waters of the Ware River Valley swept west of Wa})ples station and past 



