3 12 
The Ohio Naturalist. 
[Vol. VIII, No. 6, 
siderable Lenina trisulca. Around the borders of the pond is a 
vigorous growth of the following species from the adjoining forest 
formation: 
Impatiens biflora, 
Dryopteris spinulosa, 
Dryopteris thelypteris, 
Geranium robertianum, 
A dice a pumila, 
Washingtonia claytoni. 
Back of the cottages near the Government Dock there is a 
swampy area which evidently represents advanced stages of the 
lagoon succession in a lagoon which must have been initiated dur¬ 
ing severe northwest storms in the Bay. The depression is long 
and narrow and runs almost at right angles to the general direc¬ 
tion of the large sand ridges of the Ridge Section, and is very 
nearly parallel to the general direction of the shoreline of the 
Bay near by. The vegetational structure of this depression is 
approximately a Calamagrostis Wet Meadow Formation in the 
central portion and rapidly invading this area from the sides is 
the Cephalanthus-Cornus Thicket Formation, around which, 
and in many places in which, is a strongly developed Rhus hirta 
Thicket Formation. 
THE-BEACH-SAND PLAIN-THICKET-FOREST SUCCESSION. 
In the time intervals between the initiation of the great sand 
ridges on Cedar Point there was, evidently, a gradual accumu¬ 
lation of sand along the beach of the Ridge Section of the penin¬ 
sula, causing an outward growth of the land form without the 
building up of ridges, or, if ridges were initiated by the cutting 
off of lagoons, the sand drifted in from the adjoining land and 
from the new beach to such an extent that the lagoons were 
soon filled, the final result being, in either case, a level expanse 
of sand plain elevated but a few feet above the level of Lake Erie. 
A considerable portion of Cedar Point consists of what may 
be called Sand Plain. This habitat comprises: (a), the level 
expanses between the ridges of the Ridge Section; (b), the main 
part of the Bar Section; and (c), a large proportion of the Dune 
Section, including also the more or less transitional portion of the 
peninsula between the Dune Section and the Ridge Section 
where part of the amusement tents and trinket stands of the 
Pleasure Resort are located. It is very difficult at times to draw 
more than an arbitrary line between sand plain and dune, es¬ 
pecially in the Dune Section; both these physiographic structures 
owe their elevation above Lake level to the accumulation of wind 
drifted sand and differences of topography rather than of origin 
must be taken into consideration when an attempt is made at 
classification. 
