592 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



4. Finally the waters expanded so considerably that the Pelhara River 

 emptied into the lake thus formed, building the delta already described 

 above Dwight's station, and soon disappearing. 



THK SUNNY VALLEY LAKE. 



The only other large accumulation of glacial sands on the eastern side 

 of the river occupied the Sunny Valley in the northern part of Warwick, 

 and extended across into Winchester, New Hampshire, and was drained by 

 the Valley Brook into the Perchee Brook and thus into the Connecticut. 

 This lies for the most part outside the limits set in this work. 



THE SANDS ALONG THE WEST SIDE OF THE MOUNT TOM RANGE AND IN THE 

 WESTFIELD BASIN ABOVE THE LEVEL OF THE HIGH TERRACE. 



The sands which rest against the northern slope of the Holyoke range 

 extend west to a point a little beyond the notch road, and are conspicuously 

 absent from the rest of the north face of the range farther west. This may 

 indicate the distance west to which the waters penetrated from the Dwight's 

 station lake, or enlargement of the Pelham River (see p. 589), or these 

 sands may have extended farther west and have been swept away by the 

 later lake waters. Sands at the same level above the high ten-ace begin 

 again on the west side of the river, just east of the old road to the Nouotuck 

 Mountain House, and extend thence along the whole face of the Mount 

 Tom range in Northampton and Easthampton, in a great mass of ridgy 

 sands and gravels, in which the high terrace flat of the lake is cut. Similar 

 sands at the same level also cover White Loaf, in Southampton, and the 

 ridge east, which rise as islands in the broad sand flats of the Hampden 

 plains. They are not given on the map. They had clearly a common 

 origin, having been swept in between the mountain and the ice, or off the 

 ice onto these islands after the ice had uncovered them, and they stood out 

 like nunataks above it. They have served a common purpose in the later 

 economy of the valley, as they furnished, I have no doubt, a large portion 

 of the material carried south by the two channels on either side of White 

 Loaf, and spread as coarse gravels around Hampden ponds, which dwindle 

 farther south in the broad plain to the fine sands of "Poverty Plain," here, 

 of course, reenforced by the abundant contributions of the Westfield rivers. 



