92 Reviews — Tungsten and Tin in Burma. 



The Distribution of Ores of Tungsten and Tin in Burma, 

 By J. CoGGiN Brown and A. M. Heron. Rec. Geol. Surv. 

 India, vol. 1, pt. ii, j)p. 101-21, with two plates (maps). 

 1919. 



TN this pajoer we have at last definite detailed information as to 

 -^ the geological occurrence and relationships of the tungsten and 

 tin lodes of Burma and the neighbouring districts. They extend 

 over an area 720 miles in length, from Byingyi in the Yamethin 

 district, Southern Shan States, to Maliwun in Mergui, in the extreme 

 south. The lodes are closely associated with a very acid granite 

 intruded into the ancient Mergui sediments. Some of the lodes are 

 typical pegmatites and greisens, while others are quartz veins in 

 the narrower sense of the term, but all appear to be of similar 

 magmatic origin. This is supported by the occurrence in places of 

 tourmaline, topaz, and fluorite. The characteristic minerals 

 are arsenopyrite, chalcopyrite, pyrite, molybdenite, native bismuth, 

 and other bismuth ores. At the present time a large proportion 

 of the output of both wolfram and cassiterite concentrates comes 

 from various detrital deposits. Wolfram is rare in true alluvium, 

 but cassiterite is common in places. 



Full descriptions are given of the lodes in all the mines, most of 

 which have been inspected by the authors. Hermyingyi is probably 

 at the present time the largest wolfram mine in the world, having 

 produced in 1917 no less than 1,051 tons of concentrates, out of 

 a total of 3,654 tons for the whole district. 



Report on a Collection of Cainozoic Fossils from the 



Oil-fields of Papua. By F. Chapman. With Geological. 



Introduction by Arthur Wade. Bulletin of the Territory of 



Papua, No. 5. 18 pp. Melbourne, 1918. 



rriHE oil-bearing strata of Papua skirt the coast on the south- 



-^ west from Yule Island to the Parari delta. They range, as 



appears from Mr. Chapman's determinations, from Recent to the 



base of the Miocene, and below them are some grits, conglomerates, 



and sandstones, apparently without fossils but with traces of 



limestone and coal. Mr. Chapman's report is for the present only 



a list, but as Dr. Wade points out in a most interesting introduction, 



it is of much importance in working out the classification and 



tectonics of the strata and in elucidating such wider questions as 



the relation of Papua to the adjacent land areas. • 



