8 B. Koto : 



up angular spaces, or forms myrmekitic bodies with the plagio- 

 clase. Locahty: Nien-yii-ling. 



3) The Middle Cambrian limestone (-Ga) and the Lower 

 Cambrian red breccia (-G). The latter is a rather fine, grayish and 

 reddish variegated breccia, consisting of subangular fragments of 

 microcline and quartz, plagioclase and orthoclase, and lastly, 

 melaphyre, cemented with reddish granitic sand and calcareous 

 matter. The breccia contains slightly pinkish, flattened marly 

 nodules of the size of 4 to 8 cm. with a thickness of r/2 ^'"^ with 

 no trace of organic structure. Localitj^: Hsiao-mai-pu-tzu. 



4) The Miocene Tertiary (t) of the type of the Mu-shun 

 colliery, composed of shales and medium-grained gray sandstone 

 with a poor seam of coal. 



5) Plagioclase-basalt (/9,). 



C) Nepheline-basalt (y9...). Localit}^: Yingc-men and 

 Tsaoshiherr. 



7) Alluvium (a). 



Nepheline-basalt 



CoiiiiMisition : Essential: Augite, nepheline, olivine. 



Accessory : Magnetite, titanomagnetite, picotite. 



Accessory part : Base. 

 .^facrotextiire : Compact with minute phenocryst (less than 1 



mm.) of olivine. 

 ifiicro texture : Holocrystalline with a few^ patches of brown 



base, microporphyritic. 



Macroscopically, the rock appears uniformly gi'ayish-black, 



and is heavy and aphanitic, though, strictly speaking, finely 



granular. It is sometimes crumbly, falling into dull, polygonal, 



incoherent coccolitic clods on a slightly weathered portion, which 



