8 



AKT. 9. S]. YOKOYAArA. 



that we have here a formation which represents the middle por- 

 tion of the Mesozoic Group. 



RiCHTHOFEX in tlie second vohime of liis " Cliina " refers to a 

 coal-field situated south of AVei-hsien which certainly includes tlie 

 mine of Fang-t'u. He took it for Cail)oniferous (China IT, ]>. 

 227), an error which arose from his thinking that it belonged to 

 the same geological formation as the Sinian which occurs very 

 close to it. 



D. Chih-li-Sheng.^^ 



Mesozoic plants were collected only in a single locality, viz. ; 



Lao-tung-ts'ang, Hsuan-hua-Fu.-^ 



According to Mr. Ogawa who made this collection, the 

 coal-hearing strata of this place are sandstones and shales, overlaid 

 by a conglomerate composed of pebbles of porphyrite and pre- 

 senting a tuffy character. Their strike is said to run parallel to 

 the mountain-rano;e of Clii-min2;-shan which takes a east-north-east 

 and west-south-west direction, and is made up of highly contorted 

 layers of the platy sandstones, white limestones, etc. of the Sinian 

 formation. The geological j^i'ofile is as given below. 



Hsiahorn/iinji 



Chimingpu 



1. Sinian Formation (Palreozoic). 



2. Conglomerate consistini; of juirpliyrite-pohbles. 

 P>. Coal-bearing Series. 



4. Lœss. 



5. Yonnw Quaternary liver-gravel. 



1) lt*tft^ 



2) âlt/fJ^iTiff. 



