56 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



. Neversink Pond, Barses Pond, Creek Pond, and Leonard Pond 

 are the remnants of larger water bodies now converted into 

 swamps.. Sqtiantz Pond and Hatch Pond have dams of drift. 

 Eureka Lake and East Lake appear to be rock basins whose 

 levels have been raised somewhat by dams of till. Great Moun- 

 tain Pond and Green's Pond, between Great Mountain and Green 

 Mountain, are surrounded by rock and their level has been raised 

 several feet by artificial- dams. Great Mountain Pond is at least 

 50 feet above the level of Green Pond and separated from it by a 

 rock ridge (fig. 2). 



HISTORY OF THE GLACIAL DEPOSITS 



A tongue of the glacier is supposed to have lain in the valley 

 of the Umpog and gradually retreated northward after the ice 

 had disappeared from the uplands on either side. The ridge of 

 intermediate height built of limestone and schist, which extends 

 down the middle of the valley, was probably covered by ice for 

 some time after the glacier had left the highlands. 



When the mountain mass extending from Pine Mountain to 

 Town Hill west of the Umpog Basin and the granite hills to the 

 east terminating in Shelter Rock are considered in their relation 

 to the movement of the ice, it is apparent that the valley of the 

 Umpog must have been the most direct and lowest outlet for 

 glacial streams south of Danbury. These streams built up the 

 terraces and other deposits of stratified drift which occupy the 

 valley between Bethel and West Redding. 



The heavy deposits of till near West Redding mark a halt in 

 the retreating glacier. The boulders at this point are large and 

 numerous,, and kames and gravel ridges were formed. The 

 deposits at the divide, supposed to have formed a glacial dam 

 which reversed the Umpog, 1 are much less heavy than at points 

 short distances north and south of the water parting. 



As the ice retreated, sand and gravel in the form of terraces 

 accumulated along the margin of the Umpog valley, where the 

 drainage was concentrated in the spaces left by the melting of the 

 ice lobe from the hillside. Among these deposits are the bodies 

 of sand and gravel which lie against the rocky hillslopes most of 



'Hobbs, W. H., op. cit. 



