Naibuchi river, and other places. 



The Jurassic has only been observed in the Russian part of the island ; Mr. 

 Frederick Kleye, in Alexandrofsk, who lived there for many years, showed me 

 a letter from Professor E. Fraas (dated Feb. 22, 1904) stating that the fossils in 

 marl}- nodules from Andree-Iwanofskoe near Rykoff may be identical with the 

 Ast arte depressa from the Lower Oxfordian of North America. 



The Tertiary rocks occup}- the largest area in the island, and are especially well 

 developed in the Western Range, where various beds with characteristic fossils are 

 met with. The rocks are sandstones, which are sometimes siliceous, sometimes 

 tufaceous, sometimes glauconitic and sometimes banded with lighter and darker 

 coloured portions, and often broken in plates ; shales, which are sometimes very 

 dark, but sometimes tufaceous with gray or almost white colour, and in many cases 

 contain marly nodules with or without enclosed fossils, and various con- 

 glomerates ; besides tuffs of different colours, white, gray, green, and so forth, as well 

 as agglomerates, both of which are sometimes as extensively developed as in some 

 parts of Hokkaido. Agglomerates with associated tuffs are observed on the east 

 coast, about 16 km. to the south of Narumi, near Wäre, at and near Cape Notoro, 

 also near Ushoro on the west coast. The diatom-earth, attaining in Hokkaido a 

 great thickness of 12 meters, is not found in Sakhalin. 



Although the relative position of various fossiliferous beds in the Tertiarics 

 has not yet been made out, the plant-bed with several broad leaves and one or two 

 kinds of Sequoia leaves associated with coal-seams in the Naibuchi and Serutonai 

 coal fields and on the river Khandasa on the boundary region, can directly be 

 compared with that in Hokkaido, which was also formerly believed to be Miocene. 

 The coals of Sakhalin, which are often more than 3 meters in thickness, resemble 

 in part those of the Ikushumbets mine in Ishikari, Hokkaido. Besides, the pale- 

 gray tufaceous sandstone, associated with many coals in Sakhalin, strikingly 

 resembles that in several coal-fields in Hokkaido, as those of Ikushumbets and 

 Poronai. The mineral resin, which is observed in sands of sea-beaches on the coast 

 of Patience bay and other places, seems to have been derived from the coal by its 

 disintegration. Silicified wood is found not only in coal-fields but also in several 

 other places. 



In the Tertiaries of Sakhalin, the following beds with animal fossils are 

 distinguished : 



(1.) Shale with calcite pseudomorphs resembling thinolite. 



