Peat and Marl 



353 



the conditions for incomplete decay of plants prevail; 

 and from the foregoing it will be seen that peat is not 

 likely to be composed of the remains of sphagnimi 

 alone. The forefront of advancing shore vegetation is 

 led by a number of plants of very different character. 



MF 



Bf Bs.Bra 





;d-«- 



f'iG. 210. Dachnowski's diagram illustrating three stages in the filling 

 of a pond with deposits of peat and marl. Peat is stippled; marl, 

 cross-lined. 



OW, open water; M, marginal succession; S, shore succession; B, bog succession, 

 including bog meadow (Bm), bog shrub (Bs), and bog forest (Bf); MF. mesophytic 

 forest. 



