^ol I. Sun — Cambrian Faunas of North China (iv) 7 



STRATIGRAPHIC SUMMARY 



The Cambrian is known at present from Chihli, Shantung, Shansi and Man- 

 churia. The Uthologic character of each formation varies according to the condition of 

 the deposition. Generally the southern regions (Shantung etc.) are characterized by 

 limestones in the Upper Cambrian (Chaumitien), while this formation is represented by 

 shales interbedded with Wurmkalke in Chihli. Farther north-east (Manchuria), apart 

 of the Changhia limestone is replaced by the red shale. 



The subdivisions of the Cambrian as now recognized in North China are as 

 follows : 



SUPER-FORMATION 

 Lower Ordovician 

 Probably a disconformity in all cases; (ascertained in many). 



CAMBRIAN 



Upper Cambrian 

 Fengshan series 

 Chaumitien formation 



jMiddle Cambrian 



Kushan formation 

 Changhia formation 



Lower Cambrian 



Manto formation 



CHIHLI PROVINCE 

 A. Kaiping Basin. The Cambrian strata are well developed in the Kaiping 

 Basin and the subdivisions are as follows: 

 ORDOVICIAN 



Yehli limestone 



disconformity 

 Upper Cambrian 



5 Fengshan series 200-300 ft. 



4 Changshan series 150-200 ft. 



Middle Cambrian 



3 Kushan formation (a part) 0-50 ft. 



2 Changhia Hmestone 300-400 ft 



