50 



Plate 5.— Classification: system Marine, subsystem Intertidal, class Unconsolidated Shore, subclass Sand, water regimes 

 Regularly Flooded (seaward from the woman to the breaking waves) and Irregularly Flooded (landward from the woman to the 

 base of the sand dunes), water chemistry Euhaline. Lines of wrack (dead Fueus spp., Ascophyllum nodosum, and Zostera marina) 

 on the beach mark the landward limit of various high tides during the past several days. The photo was taken at low tide. (Parker 

 River National Wildlife Refuge, Essex County, Massachusetts; September 1985; Photo by F. C. Golet) 



