3°6 
The Ohio Naturalist. 
[Vol. VIII, No. 6, 
The facies exhibit a distinct alternation in the Typha-Scirpus 
Formation. On the wet bank, and extending out into the water 
to a variable depth of about a foot, is the Scirpus americanus 
Consocies, alternating here and there with the Typha latifolia 
Consocies, while beginning in G or 8 inches of water and extending 
out into the deeper water of the lagoon, is the Scirpus validus 
Consocies, the latter thus forming a zone in the deeper part of 
the habitat. In this consocies Castalia is beginning to appear 
in a few places in the deepest part and, providing the marsh 
formation does not build up the soil and advance too rapidly, 
there may soon be initiated a new formation between the Typha- 
Scirpus Formation and the Potamogeton Formation. 
In the upper part of the Typha-Scirpus Formation, and 
extending up to the outer Populus-Salix Formation, there is a 
zone the status of which was not satisfactorily determined. This 
zone has been provisionally designated as follows: 
Fig. 4. Looking east across the new lagoon a few rods south of the 
Break-water. Typha-Scirpus Formation conspicuous. Lake in distance 
and bar visible just beyond the marsh vegetation. Young cottonwoods 
and willows in immediate foreground are submerged by unusually high 
water. 
The Salix ispp.) Formation. 
This structure probably represents a transitional condition 
the true status of which will become evident in the future. At 
present it consists of several species of Salix with scattering 
individuals of Vitis vulpina, Bidens frondosa, Polygonum penn- 
sylvanicum, Ambrosia trifida, etc. The structure is evidently 
the beginning of a thicket formation similar in position to the 
Myrica-Salix thicket formation on Presque Isle. 
