6 Art 8. — A. Kryslitofovich : 



found closely connected witli the Cretaceous fauna. The plant- 

 remams have been found to represent different horizons of Cretace- 

 ous and caused a considerable change in the stratigraphy of Sakhalin. 

 Although I was not able to look througli the whole of our 

 collections, but only a small part of it presented to the Imperial 

 University of Tokyo and the Geological Survey of Japan, I could 

 determine not less than thirty four different species. Some of the 

 plants were prehminarily determined, either in situ or only from 

 my sketches. 



When the present paper was nearly finished, Dr. H. Tanaka- 

 DATE kindly showed me his manuscript, written in 1908, entitled 

 " General Geology of the southern part of the Naibuchi Coal-field 

 on the river Onnenai, Sakhalin." The Cretaceous of South Sakha- 

 lin, which he comi^utes to ba 3000 feet in thickness, he compared 

 with the upper part of the Senonian in Hokkaido, and found there, 

 together with Ammonites and other animal fossils, several plants, as 



Sequoia Eeichenhachii (Gein.) Heee v. longifolia Will. 



S. fastiglata Steen. (?) 



Thyrsopteris cf. varians Will. 



Ginlxcjo sp. A. 



Ginkgo sp. B. 

 and some seeds and cones. These plants he compared with the 

 Upper and Middle Cretaceous forms of Europe and America. Be- 

 sides, Mr. Tanakadate and Prof. Jimbö have kindly shown me a 

 part of their collections from Sakhahn. 



11. Geological sketch of the "Coal mining district." 



The part of Sakhalin, which we investigated, consists of Tertiary 

 and Cretaceous deposits, besides more or less consoHdated Post- 

 pliocene gravels and Alluvium. The Tertiary occupies a far less 



