JOURNAL OF THE COLLEGE OF SCIENCE, TOKYO 1MPEEL4L UNIVERSITY. 

 VOL. XL., ARTICLE 8. 



On the Cretaceous Flora of Russian Sakhalin. 



By 

 A. Kryshtofovich, 



Geologist to the Geological Survey of Russia. 



With 15 figures in the text. 



I. Introduction. 



The fossil flora of the Island of Sakhalin, wliich is very rich 

 in species, has been a subject of investigations since the middle 

 of the last century, and has hitherto been regarded as exclusively 

 of the Miocene age. 



But after the paleobotanical studies there, in the summer of 

 1917, I came to the conclusion, that its so-called Miocene flora 

 belongs in fact to several geological horizons, not only of the 

 Tertiary period, but also of the Cretaceous. Nearly all the fossil 

 plants of Russia, liitherto described as Cretaceous, belong to the 

 typical Mesozoic flora. The flora of the Klin sandstone, repre- 

 sented by ferns, conifers and cycads, and described by Aueebach 

 (1844), EicHWALD (1862; 1865), and Teautschold (1876), probably 

 belongs to the Barremian. Except some true Cretaceous woods, 

 recorded by Mercklin (1855) and Keendovsky (1880), nearly aU 

 the so-called Cretaceous plant fossils in Russia are of some 

 other age ; for instance, the plants in the white quartz -sandstone 

 of South Russia, described by Eichwald as Quercus venulosa, 



