Cretaceous and Tertiary Floras. 171 
Cretaceous. SAPORTA ’) is struck by this phenomenon of the sudden appea- 
rance of so many forms, and some of them the most highly differentiated of 
dicotyledonous plants. The early stages of their evolution may he thinks have 
been obscure, and as yet unobserved, or they may have taken place in some 
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ig. ı. Map illustrating position and extent of Land during the lower Cretaceous 
Period, as wellasthe Distribution of Land Plants. 
RE Northern Coniferous Forest Types. Tropie Types of Vegetation’ 
1) SAroRTA, Monde des Plantes p- 197: 
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