•j |s RECORDS OF THE GEOLOGICAL COMMITTEE 



OF TILE RUSSIAN FAR EAST 



geological explorations in the district of the Possiet-Bay, 

 near Novo-Kievsk. He describes large deposits of brown 

 coa l j and niciii ions some silver lead ore and gold placer 

 deposits. In order to show the quality of the coal, he^ gives 

 its analysis, si lowing also the heating value of this mineral 

 fuel. B. E. Ahnert has collected here some well preserved 

 impressions of fossil flora, belonging to Tertiar geological 

 period and A. N. Kryshtofovich has denned them and gives 

 us a detailed description of them in the book "Some Teritary 

 plants of Possiet-Bay." In addition he draws a historical 

 sketch of the study of the fossil flora found on the Pacific 

 Coast and in the Eussian Far East and quotes the literature 

 referring to this question. A. N. Kryshtofovich has also 

 studied and described some petrified tertiary plants from 

 the river Amagu in Primorsky Province, and found a collec- 

 tion of fossil fauna in the Eussian Sakhalin, near the mouth 

 of the river Hoya. These petrified mollusks have been in- 

 vestigated by Dr. Hayasaka and the results published by 

 the Committee in the book: "On a collection of the creta- 

 ceous fauna from Eussian Sakhalin." The discovery of these 

 representatives of the Chalk stratum is of an interest, as 

 their presence discloses the age of some doubtful layers. 



A. N. Kryshtofovich undertook during his visit to Japan 

 some geological studies of the fossils of this country and 

 gives some information about this subject in his "Beport on 

 the results of studies in Japan in 1919-1920." 



All the said editions represent a valuable donation to 

 the scientific literature about geology of the Far East, having 

 also a practical interest for the mining men. The books 

 are neatly printed and furnished with tables containing 

 excellently executed photographs of the fossil remains. 



Bearing in mind that practically the vast area of the 

 Eussian Far East has not been systematically explored from 

 a geological standpoint of view and the discoveries, which 

 have been of benefit to the development of mining enterprise, 

 have been mostly of an accidental character, we must admit 

 that any explorations, being led according to a plan by 

 specialists, are of a particular value and it should not be 

 forgotten that the work of the Geological Committee of the 

 Eussian Far East must be done under specially grave con- 

 ditions. 



A. B. 



