Bul. 1419, U. S. Dept. of Agriculture 
PLATE 7 
SUBSIDENCE OF FORESTS AND HIGHWAYS ON PEAT LAND WITH AN UN- 
STABLE STRUCTURAL FRAMEWORK 
|, Swamp forest which emerged after the trees had died: B, roadbed sinking into water 
pockets (photographed by H. R. Sayre); C, upheaved layers of peat along a sinking high- 
vay (photographed by W. E. Tharp)