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 sphagnum 

 alone. The forefront of advancing shore vegetation is 

 led by a number of plants of very different character. 



Mr . 



Bf Bs Bm S M O-W 



y 'J'V-: 





Bf Bs.Bm 





Fig 210. Dachnowski's diagram illustrating three stages in the filhng 



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



cross-lined. 

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



iAcSng bog meadow (Bm), bog shrub (Bs), and bog torest (Bf) ; MF, mesophytic 



forest. 



