SAND DUNES OF COOS BAY 



243 



season, although it was evident that the seashore marshes possess 

 a much more varied flora. 



Figure 2 shows the great height which the dunes attain and the 

 " ravine-hke " hollows in which the forests make their last stand. 

 The trees in this photograph are being gradually overwhelmed by 

 the dune barely showing in the foreground. Rarely, another 



Fig. 2. A surviving body of forest being overwhelmed by the dune just visible 

 in the foreground. This shows the frequent ravine-like formations caused by 

 nearly contiguous dunes. 



method of destruction is seen when a hollow occurs near the wind- 

 ward side of a forest. These hollows seem to progress with the 

 dunes and meeting the resistance of a surviving clump of trees 

 destroys them by undermining, the sand blowing away from 

 underneath the trees so that in time they topple over. 



