504 Kryshtofovich — Cretaceous Age of the 



Range stretching from the Japanese frontier terminates 

 somewhat to the south of Alexandrovsk, in Cape de la 

 Jonquiere, being limited by the Gulf of Tartary on the 

 west and by the graben of Dui river ( Alexandrovka) on 

 the east. In the same direction but farther toward the 

 north stretches the Western Range. This mountain 

 chain is separated by the Coast Range from the sea shore 

 to the south from Alexandrovsk. Farther to the north 

 the country is quite open from the sea. According to the 

 testimony of the animal fossils the median part of the 

 Coast Range consists chiefly of the Cretaceous, especially 

 its upper series, which further to the east is interrupted 

 by the fault along the left bank of Alexandrovka river. 

 The Cretaceous here contains sandstones with conglom- 

 erates as well as the dark slate with coal, and character- 

 ized by both faunal and floral remains. This is overlain 

 without discordance by the Lower Tertiary with two beds 

 of conglomerate at the boundary, in turn intercalated 

 with the coaly shales the age of which is not yet deter- 

 mined although some fossil plants were collected at this 

 horizon. We observe the Cretaceous further to the east 

 beyond the valley of Alexandrovka, where it appears on 

 the slopes of the Western Range. Here it is also coal 

 bearing and at least a part of it represents a more ancient 

 series, characterized only by the fossil plants and lacking 

 the fauna found associated with plants in the Coast 

 Range. As I have observed, the whole western slope as 

 far~as Cape Khoi is made up of the same Cretaceous 

 partly unconformably overlain by the younger Tertiary. 

 In the same area, somewhat to the northeast from Alex- 

 androvsk, are exposed the most ancient known Creta- 

 ceous strata of the region, characterized by a flora of 

 ferns — mainly Gleichenia. 



According to the differences indicated by the floras 

 represented at the different horizons of the Cretaceous, 

 and having in mind the presence of the Senonian Inocera- 

 mus fauna 9 in the upper beds, I propose dividing: the 

 Cretaceous into the following three series: I, Upper 

 or Orokkian Series; II, Middle or Gyliakian Series; 

 III, Lower or Ainuan Series. 



9 Sokolow, Kreideinoceramen des russischen Sachalin. Mem. de la Comite 

 geol., n. s., livr. 83, St.-Petersb. Also Schmidt, 1873, Ueber die Kreide 

 Petrefacten von Sakhalin, Mem. Acad. Sci. St.-Petersb. (7) vol. 19, No. 7; 

 Yabe, 1909, Zur Stratigraphy und Paleontologie der oberen Kreide von 

 Hokkaido and Sachalin, Zeitschrift der Deutsche Geol. Gesell., vol. 61, p. 402. 



