-62- 
vicinity of the lake, due to the flat nature of the valley. 
At this point the river is a sluggish, meandering stream 
20 - 40 m. wide, doing very little vertical cutting, but 
shifting its course from time to time. Carp Lake is merely 
a broadened part of the river. According to Wright (28 ) 
the valley resulted not from the erosive action of a former 
river but to the pounding action of the waves on the shores 
of a vanished lake which covered the area. The present 
floor of the valley is subject to periodical flooding, in 
which a certain amount of sediment and debris from higher 
levels is laid down. There is thus a lack of stabilization 
in the edaphic conditions which prevents the encroachment 
of the mesophytic forest. The lino of demarcation between 
forest and flood plain is usually very abrupt, as shown in 
fig. 40. Flooding has the effect of producing irregularities 
and telescoping in the hydraroh successions paralleling the 
river, so that these successions are evidently not playing 
a prominent part in the formation of the forest. There are 
a few points along the range, however, where transitional 
bog forests may be found. One occurs between secs. 13 
and 18, T. 51 H. (fig. 42). This is near the mouth of a 
drainage system coming directly from the ridge. This 
forest is quite limited in extent. Its interest lies in 
the suggestion it gives as to the character of the bog 
