On the Cretaceous riom of Paissian Sakhalin. 15 



Cretaceous age. When the complete study of all the materials 

 has been made, the number of species will surpass one hundred. 

 The composition of forms û'om the dififerent locahties has enabled 

 me to trace roughly the following evolution of the flora in Sakha- 

 lin in three stages from the Middle Cretaceous to the Upper. 



1. The Orokkian Floea. 



The Upper Cretaceous in Sakhalin, formerly regarded as its 

 sole representative of this system in this island, contains several 

 animal fossils, belonging to the Senonian. The occurrence of a 

 rich flora, also Senonian, was only observed in 1917 and permitted 

 us to establish a real Senonian standard of flora for all Eastern 

 Asia. 



At Cape de la Jonquière, a rich flora has been collected 

 below the Inoceramus horizon. It appeared to be that which 

 misled ScnrnDT to the conclusion of an inversion of strata found 

 there, which reaUy does not exist. The same explanation was 

 made by Heee about the Nanaimo Group of Yancouver,^^ with a 

 true Cretaceous fauna and a flora with young aspect. 



The following forms were coUected in the Orokkian, chiefly 

 at Cape de la Jonquière : 



Asplenium Dlcksonianum He., 



Sequoia Smittiana He., 



Populus arctica He., 



Credneria sp., 



Heeler a McClurii He., 



Viburnum Schmidtianmn He. 

 Near Cape Eogatyi, Populus arctica and other Dicotyledons 

 were collected above the Inoceramus horizon. The specimens from 

 this series, besides those mentioned above, have not yet been fully 



1) Heee (1867). 



