THE POSTGLACIAL CONNECTICUT AT TURNERS FALLS 465 
Half a mile further southwest along the same ridge of red 
shales is Poag’s Hole, a similar gorge, somewhat deeper, but of 
comparable area. Fig. 5 shows the western rock wall. The 
crest of the wall at the back is about twenty feet above the 
crest at the Lily Pond and the sills in front of the pools have 
nearly the same difference of level. This fall, then, was cut by 
the river earlier than that at the Lily Pond. 
The ridge in which these two gorges are cut has a northern 
front of exposed shales and sandstones, which strike a little 
north of east and dip moderately to south. The strata are con- 
tinuous across the gorges and were once everywhere overlain by 
clays under sands and gravels, all of glacial origin. The clays are 
now exposed in the 270-foot flat on the south side of the ridge, 
between Poag’s Hole and Lily Pond. The highest point on the 
