On the Cretaceous Flora of Russian Sakhalin. 9 



loose Tertiary rocks of the Alexandrofka valley. Besides some 

 mighty exposures near Rogatyi, at Spasemiyi and at Cape de la 

 Jonqnière, the Cretaceous is found also on the sea shore between 

 Little Sertunai and a place lying a little to the north of Myngidai. 

 Another area of Cretaceous extends from a place lying a little to 

 the south of Tangi as far as slightly beyond Cape Khoi. 



The part of the Cretaceous of Sakhalin known before and 

 represented by marine deposits was liitherto considered as belong- 

 ing to the Senonian, and its thickness was estimated at 3500 feet. 

 But we know now that there are also Turonian, Cenomanian and 

 probably even older divisions of the Cretaceous, thus doubling the 

 thickness and making it at least 7000 feet altogether. The new 

 annexed part, represented by these lower divisions, was as a whole 

 treated before as Tertiary. 



The strike of the Cretaceous strata is meridional, with some 

 deviations here and there, the dip being generally westward on the 

 sea coast, and chiefly eastward inland, that is to say on the slopes 

 of the Western Range. 



The Cretaceous deposits consist of sandstones (partly coarse), 

 conglomerates (gray and bluish-gray) and shales partly carbonace- 

 ous ; besides some coals, which contain generally more ashes than 

 those of the Tertiaries. All the Cretaceous rocks, except the 

 marine facies, mainly developed in the Coastal Range and belong- 

 ing to the upper part of the formation, are characterized by numer- 

 ous impressions of plant leaves in fine rocks and traces of wood 

 in coarse ones. Based on the study of the leaves, I have to pro- 

 pose a triple division of these beds, which will be characterized 

 as follows : 



I. The Oeokkian Series. 

 This series is made up of light-gray and light-greenish sand- 



