On Nepheline-basalt from Yingé-mt'n, Mnnclunia. 7 



Cambrian and Tertiary terranes. The present paper deah with thü 

 neplieline-hamlt . It was impossible for me to ascertain exactly the 

 mode of occurrence of tlie basalt in my hasty journey through the 

 snow-covered region in tlie cold Manchurian winter with the 

 mercury at -36°C; and moreover the presence of nepheline in the 

 basalt was discovered only after I had reached home and was able 

 to examine slides of the rocks collected during my trip. The age- 

 relation between the more basic, sodic nepheline-basalt on the west 

 and the calcic plagioclase-basalt on the east was not ascertained, but 

 the former is probably older than the latter. This may be conjec- 

 tured from the incised character of tlie topography resulting from 

 denudation ; while the common basalt on the east builds up a long 

 monotonous mesa (Cliang-hang^^) with sharp escarpment. (PI. I. 



fig- 1.) 



One specimen was struck at Tsao-shih-crr^ (PI. II.) in the upper 

 Shan-sliêng-tzu plain, at the forking of the road to Kai-yuan and Yingê- 

 wên, and another specimen was picked up quite by chance by 

 H. Murakami in the gravelly bed of the Hun-lio river near the 

 already-mentioned Yingé-mên gate. The geology of the " lingê-mên 

 area " is roughly indicated in the annexed sketch map (PI. IL). 



The geologic formations, cartographically represented, are as 

 follows: 



1) The flesh-red, coarse-aplitic, microcline-rich orthogneiss 

 (^), greatl^^ mylonitized, forming the basement of the overlying 

 complex. 



2) Diorite (o), probably a differentiation-product of an 

 alkaline granitic magma, No. 1. It is a grayish, medium-grained 

 quartz-diorite, composed of short prismoids of deep greenish- 

 In'own hornblende, and bent lamellae of oil-brown biotite, besides 

 plagioclase with the characteristic zonal structure. Quartz fills 



(I ^Ig 2) !^]fi^ lu Plate II. it is erroneously spelled Tsaos/tKT, 



