324 



The Ohio Naturalist. 



[Vol. VIII, No. 6, 



The Quercus velutina-imhricaria Forest Formation, however, 

 in this part of the peninsula is far from being a continuous closed 

 forest but is interspersed here and there with areas of open sand 

 plain, giving to the whole a park-like aspect. 



The Blowout Formations. 

 W'ith the formation of dunes by the piling up of sand around 

 the vegetation, there is a tendency towards the deflection of the 

 wind so that its abrasive effect is intensified in open areas in close 

 proximity to the dune. The usual result of this is a hollowing out 

 of the sand at such points, constituting thus a "blowout." 

 Cowles in his work on the sand dunes of Lake Michigan has termed 

 as "fossil beaches" such beach habitats as have been covered 

 over with dune sand or sand plain and later exposed again by 

 the drifting awav of the sand.-" 



Fig. 12. In Sand Plain at edge of oak forest in northern part of the 

 Dune Section. Quercus imbricaria here affords shelter under which many 

 Juniper seedlings are in evidence. This will likely become in time a dune 

 capped by Junipers. 



Towards the northern part of the Dune Section the Blow-outs 

 are soon occupied by the Arctostaphylos-Juniperus Heath For- 

 mation as described for the dunes although here perhaps some- 

 what more vigorous than on the dunes; due perhaps, to the some- 



20. Cowles, H. C. 1. c. Bot. Gaz. 27 : 173-175. Fossil Beaches. 



