12 Art. 8.— A. Kryshtofovicli : 



with coals, and are characterized by ferns, chiefly Glelchenia, to- 

 gether with some primitive Dicotylédones. 



The real extent, thickness, composition, as well as the relation 

 to the series above, have not yet been ascertained. 



Mutual eelations of the Cretaceous Beds of Sakhalin 



AND Hokkaido. 



In literature, partly published and partly in manuscript, we 

 find sufficient evidence to regard the Orokkian Series of Eussian 

 Saldialin to have an equivalent in Japanese Sakhalin, which is 

 distinguished by animal remains and a few plant fossils. Nothing, 

 however, can be expressed on the probable equivalents of the 

 Gyliakian and Ainuan in Japanese Sakhahn. 



The Cretaceous of Hokkaido is represented by facies different 

 from those exposed in Sakhalin.^^ Thus, beginning from Cenoma- 

 nian, the marine beds with rich faunas in Hokkaido represent 

 rather deep and long existing seas, while contemporaneous deposi- 

 tion in Russian Sakhalin took place mostly on land and partly in 

 shallow seas. Only near the end of the Cretaceous period marine 

 transgression took place in Sakhalin in the horizon corresponding 

 to the PacJii/discus horizon of Hokkaido, and showing homogeneous 

 facies. All the other divisions of the Cretaceous in Russian Sakhalin 

 are represented by shallow sea or continental coal-bearing deposits 

 without any fauna except some tracks of animals, known as Fa- 

 coids, among these I determined Gyrochorda afF. comosa Heer on the 

 Tymovskaya river. Probably, the above mentioned transgression 

 did not extend further north than Cape de la Jonquière, all the 

 Cretaceous deposits being continental beyond this limit. The con- 

 temporaneous horizons in Russian Sakhalin and Hokkaido may be 

 represented as follows : 



(1 Yabe (1909). 



