quartzitc is also found there, A black, minute-scaly biotite-schist is observed on 

 some places on the sea-coast between Dubki and Ochopokka ; a gabbro-diorite is 

 also .found there associated with the schists. There are, however, remarkably- 

 wanting the piedmontite-schist and spotted schists, which are characteristic to a 

 similar formation in the mountains to the north-west of Tokyo. We can not tell at 

 present, whether these schists in Sakhalin represent one or other of ]\Iikabu and 

 Sambagawa Series of this region. Moreover the occurrence of diabase-tuff amongst 

 the schists in Sakhalin raises the question as to whether it makes a concrete part of 

 the schistose series or not. The character of stratification can only be observed in 

 the Susuya Mountains, where the strikes are most frequently meridional. 



The next older rocks are the ordinary Palaeozoic Sediments, such as 

 sandstone, phyllite, clayslate, quartzite (both red and gray), diabase-tuff (red and 

 green), and limestone, the last of which is sometimes interbedded in the tuff. The 

 gray quartzite is sometimes so very irregularly cracked, as to look brecciated. for 

 instance on the northern shore of the larger basin of the Chipesani lake. No 

 fossils have yet been found in the Palaeozoic, except indistinct Radiolarian remains 

 in some red quartzites. Most of the exposures show^ distortions, but where 

 the stratification is rather regular as on a very limited portion of the 50th. Parallel, 

 we find the meridional strike prevailing. 



Eruptions of diabase in the form of masses and interstratified tuffs are of 

 common occurrence in the Palaeozoic, l^ut the hornblende-granititc, which 

 changed the strata by contact action, must be specially mentioned. The principal 

 locality of the granite is at Cape Shiretoko and its vicinity, where KatAYAMA 

 found a biotite-hornfels on the contact. On the boundary region of the 50th. 

 Parallel, the granite appears as boulders in a river, but the extent of contact 

 metamorphism is not very limited. There is a very well cleaved, compact biotite- 

 hornfels, and a green, massive, and compact amphibolite. The former is no 

 doubt derived from the clayslate and the latter from a tuff, although no gradual 

 transitions from those sediments are observed in the field. KAWASAKI also found 

 a hornfels on the mountain Tokuso in the Northeastern Mountain-land. Large 

 boulders of granite, found on the Kaihyötö and near Cape Patience and many other 

 places on the coasts of Sakhalin, indicate a rather wide distribution of this rock. 

 Pebbles of quartz-diorite and a contact slate, with characteristic hexagonal trillings 

 of cordierite, as those abundantly found at several places in Japan, have been 

 met with on the river-bed of the Naibuchi. 



The Mesozoio rocks, whose total area is next to that of the Tcrtiaries, show 

 their principal development in a broad zone on the west side of the Median 



