1905) TRANSEAU—BOGS 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 
isalmost completed. In the bog about to be described we find this 
pss 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. 
ie 
ale an feet. 
Se 
Fic. 9.—Bog near Oxford, Oakland county. 
ND COUNTY. 
rd Tp., there is a 
). Although it lies 
BOG NEAR OXFORD, OAKLA 
Near the northeast corner of Sec. 31, Oxfo 
& (fg. 9) covering about 4.5 acres (1.8 hectares 
a few miles beyond the real boundary of the Huron River basin, it 
1S included because it exhibits a flora somewhat different from the 
other areas, and may be considered as a neat approach to the type of 
bogs occurring farther north. The basin is a depression in the 
Sutwash sands and gravels of the interlobate moraine. It is sur- 
