20 GEOLOGIC WORK OF ATMOSPHERE 



Fig. ii. Lee side of a sand dune, Cape Henry, Va. The dune is advancing on 

 a forest and burying the trees. (Hitchcock.) 



are exposed. Trees and other objects once buried may be discov- 

 ered again by farther migration of the sand r (Fig. 12). 



Fig. 12. A resurrected forest. After burying and killing the forest, the sand 

 was blown away, exposing the dead trees. (Myers.) 



1 Cowles. The Ecological Relations of the Vegetation of the Sand Dunes 

 of Lake Michigan. Botanical Gazette, Vol. XXVII, 1899. An excellent study 

 of the relations of sand dunes and vegetation. 



