1905] TRANSEAUBOGS OF THE HURON RIVER VALLEY 439 



have seen that, although there are minor variations in the species 

 present, all of the bogs show a series of bog-sedge, shrub, and conifer 

 societies which are genetically related. In the Delhi bog the filling 

 is almost completed. In the bog about to be described we find this 

 process finished, and what was formerly a ring of bog-sedges sur- 

 rounding an open lake has become an irregular disk forming the 

 central plant society of the area. 



FIG. 9. Bog near Oxford, Oakland county. 



BOG NEAR OXFORD, OAKLAND COUNTY. 



Near the northeast corner of Sec. 31, Oxford Tp., there is a 

 bog (fig. 9) covering about 4.5 acres (1.8 hectares). Although it lies 

 a few miles beyond the real boundary of the Huron River basin, it 

 is included because it exhibits a flora somewhat different from the 

 other areas, and may be considered as a near approach to the type of 

 bogs occurring farther north. The basin is a depression in the 

 outwash sands and gravels of the interlobate moraine. It is sur- 



