608 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



terminal moraine, the larg-e angular bowlders being abundant. In the upper 

 portion of this moraine are curious separate areas of stratified sand, discon- 

 tinuous and much twisted in the unstratified mass of the moraine. One of 

 these is shown in fig. 34. These seem to be plainly parts of a stratum of 

 sand washed upon the broad, flat moraine and then, while frozen, broken 

 into blocks by the farther advance of the ice and mixed with the other 

 bowlders of the till. This shows the presence of a lobe of the ice, moving 

 as a vallej^ glacier down the Westfield Valley and halting at this point. 



The second matter which is well illustrated is the long-continued, 

 steady, torrential flow, and the high level of the Westfield River during the 

 time immediately following, while the stream was receiving the waters from 

 the melting ice. 



On the downstream side (the right of fig. 33) the current quickly filled 

 up the area in the lee of the moraine with strt)ngly cross-bedded sands of 

 medium grain, and above this extends for many rods a bed, 20 feet thick, 

 of well-sorted and well-rounded 6-inch gravel, in perfectly horizontal beds. 

 There is rarely a pebble above 8 inches across, and almost everything below 

 2 inches across is washed out of the bed. One gets here another side of 

 the activity of the strong stream which brought the great volume of sands 

 to build up the broad plains of Westfield and Southwick. 



