330 



Tke Ohio Naturalist. 



[Vol. VIII, No. 6, 



facies alone, the Typha latijoUa Consocies being found in the 

 deeper water and in perhaps more exposed positions than is the 

 Phragmites pkragmites Consocies. 



The immense accumulation of muck underlying this marsh is 

 likely the product of the accumulation and subsequent more or 

 less complete humification of the remains of the plants of this 

 formation. The annual growth of these plants constitutes a large 

 quantity of vegetable matter which, upon its death, is placed in 

 most favorable condi:ions for its retention and subsequent 

 humification. In places w^here the accumulation of humus has 

 been so rapid as to raise the level of the soil above the water or, 

 as along the edge of the Bar Section, where sand drifts in and 

 helps to build up the soil, there follows a succession by either the 

 Calamagrostis canadensis Wet Meadow Formation or bv the 

 Salix discolor-lucida Thicket Formation. 



Fig. 16. The Black Channel and the Fhragiuites-Typha Marsh For- 

 mation. The forests in the far distance are at the edge of the mainland 

 on the other border of the marsh more than two miles distant. 



The Salix discolor-lucida Thicket Formation. 



There are no very well marked examples of this formation and 

 its structure is not clear to the writer. However, the structure 

 has been correlated with a similar and well-marked formation at 

 Presque Isle, and in the limited areas where it occurs along the 

 Bar Section it agrees well with the Presque Isle formation. It 

 possibly may prove to be the same structtn'c as was called the 



