85 



Plate 40.-Classification: system Lacustrine, subsystem Limnetic, CLASS Unconsolidated Bottom, SUBCLASS Mud, water regime 

 Permanently Flooded, water chemistry Fresh. In the narrow Littoral zone of Yellowstone Lake, where water is less than 2 

 m (6.6 ft) deep, the bottom consists primarily of gravel and sand. (Yellowstone National Park, Teton County, Wyoming; May 

 1985; Photo by F. C. Golet) 



