604 GEOLOGY OF OLD HAMPSHIRE COU^STTY, MASS. 



THE LAST IMPORTANT HALTING PLACE OF THE ICE FRONT ACROSS THE 

 BASIN OF THE DEERFIELD RIVER. 



On page 573 I have traced the southern boundary of the ice at its last 

 marked halt across the eastern half of Franklin County, and a similar line 

 may be di-awn across the western half of the county by connecting the ide 

 barriers which formed the northern limit of the glacial lakes south of the 

 Deerfield and kept the deep valleys tributary to this river empty in their 

 lower (northern) reaches across from Coleraine to ^lonroe. 



Directly opposite the barrier on Dry Hill, in ]\Iontague, on the east of 

 the Connecticut River, is the great barrier above Bardwells Ferry (b^^) on 

 the west, and these may be looked upon as two synchronous halting places 

 of the ice front. Between these the lobe of the ice, which at the same time 

 extended down the Connecticut Valley, may have been thrust into the 

 clays south of Deerfield to produce the disturbances at the Wapping cut- 

 ting figured on PI. XVIII (p. 694). West of Bardwells are the Bear River 

 barrier (b"), that at Buckland Four Corners (lo"), that on Ruddock 

 Brook (b'^), and that above West Hawley (b'^). 



The moraine across the valley of the Deerfield above the mouth of 

 Hoosac Tunnel (d) lies in the continuation of the curved line which joins 

 these ice barriers, and as these barriers on lioth sides of the river represent a 

 time when the ice halted for an unusual time, and as they lie along a single 

 curved line, one may assume that they repi'esent a single and exceptionally 

 long halting place of the ice. 



GLACIAL LAKES NORTH OF THE DEERFIELD. 



The Hawley Lake requires no special mention (see PL XXXV, A), and 

 the high-level sands at the mouth of the tributaries of the Deerfield on the 

 north are described below. Besides these there is an interesting lake of 

 small dimensions west of Shelburne Center, extending to the river and 

 formed when the Deei-field Valley glacial lobe projected beyond the present 

 mouth of Sluice Brook, throwing back its waters into a lake which drained 

 over a rocky sluice ranniug east from near the cemetery toward the sawmill 

 south of Shelburne Center. 



Also in Charlemont, when the Deerfield Valley glacier extended just 

 beyond the village, the waters of Mill Brook were thrown east at a high 



