466 MS. VARY LE ETT SS ON 
promontory, west of Poag’s Hole, is a cap of gravelly sands 
that bring it up to the level of Montague Plain, of which it was 
doubtless once a part, most of the sand and clay having been 
removed by the river as it cut its way down toward the rock. 
Fig. 6 is a section through the highest point of the ridge just 
west of Poag’s Hole, 
Montague Plain is roughly outlined in Fig 1, the single- 
lined area suggesting the original extent of the plain formation, 
and the cross lined part being still at about the original level. 
The upper portion of the plain is everywhere of sand and gravel 
somewhat irregularly stratified. 
The formation has a considerable extension in Greenfield 
Meadows and lesser ones to north and south. The gentle undu- 
lations of the surface, together with the lack of sharp strati- 
fication suggests that the sands were not laid down in standing 
water, but rather strewn here and there by the detritus-laden 
