(iv) 8 PaUeontologia Sinica Ser. B 



Lower Cambrian 



1 Manto shale 400-500 ft. 



disconformity 

 SINIAN 



Black limestone 



IManto formation — This is the oldest known Cambrian division of North 

 China. It consists mostly of red, purple and green shales, sometimes interbedded with 

 sandy limestones. It occurs in Chao-Kou-Chuang, /tS ^ Jffi Lei-Chuang M ^f± and 

 especially in Cheng-Shan, W- ill where the section was made. The following species are 

 found in this formation : 



Brachiopoda 



1 Acrothele chuni Sun 



2 Lingulella manchuriensis? Walcott 



3 Obolus sp. 

 Trilobita 



4 Conokephalina gerardi Sun 



5 Conokephalina kaipingensis Snn 



6 Ptychoparia (Emmrichella) chengshanensis Sun 



7 Ptychoparia sp. 



H Ptychoparia yohi Sun 

 9 Ptychoparia fongi Sun 

 Changhta limestone — This consists of oolitic limestone and various shades of 

 massive limestone. It is found in the northern slope of Cheng-shan and is usually called 

 cliff limestone. It contains the following species: 

 Brachiopoda 



1 Nissusia hayasakai Sun 

 Trilobita 



2 Solenppleura nodosa Sun 



3 Anoinocare flava Walcott 



4 Lisania rectangularis Sun 



5 Lisania? hsuchiachuangensis Sun 



6 Dame sella black welderi var. minor Sun 



7 Dorypyge richtliofeni Dames 



8 Dolinometopus deois Walcott 



9 Crepicephalus sp. 



KusHAN SHALK— A part of this formation may be present, but so far no fossils 

 have been found. 



