PREGLACIAL CONDITIONS AND LIFE 



211 



3. Catalog of the Preglacial Biota 483 Referred to in this Chapter 



PLANTS 



BRYOPHYTA 

 Sphagnaceae 



Sphagnum species 



Pinus rigid a 



Juglans species 



Corylus amerkana Walt. 



Fagus grandifolia Ehrb, 

 Qiiercus alba L. 



Magnolia species 



Liquiiambar strarifl.ua L. 



Platanns occidentalis L. 



Crataegus crusgalli L. 

 " species 



Acer species 



Psedera quinquefolia (L.) Greene 



SPERMATOPHYTA 

 GYMNOSPERMAE 



PlNACEAE 



Pinus species 



ANGIOSPERMAE 

 DICOTYLEDONEAE 



JUGLANDACEAE 



Carya alba(L.) K. Koch 

 " glabra (Mill) Spach. 

 ( = porcina Nutt). 



Betuxaceae 



Betula species 

 Fagaceae 

 -ferruginea Ait) Quercus macrocarpa Michx. 



" palustris Meunch. 



Magnoliaceae 



Liriodendron tulipifera L. 

 H.amamelidaceae 



Platanaceae 



ROSACE.AE 



Primus species 



ACEEACEAE 



VlTACEAE 



4,a This catalog is necessarily very fragmentary and includes some species which may be- 

 long to a later period than that assigned. It is believed, however, that it will serve a useful 

 purpose as a basis for comparison with later biota, which are definitely fixed in their relation 

 to certain drift sheets. . No tangible evidences of life have as yet been found beneath the 

 Nebraskan drift, and we are compelled, therefore, to rely upon the territory outside the drift 

 area for evidences of preglacial life. Extinct species are marked with an *. 



