(iv) 14 Palxontologia Sinica Ser. B. 



c. Tawenkou. i^Jl^U This place, 50 li south of Tai-An, is well known for Stone- 

 swallows. This formation is very fossiliferous and of Kushan age. The lower part furni- 

 shes a large number of Drepanuras while the upper contains some Black welderias and 

 Damesellas. 



The following species were found in this formation: 



1. Drepanura premesnili Bergeron 



2. Drepanura ketteleri Alonke 



0. Agnostus douvillii Bergeron 



4. Liostracina krausii JNIonke 



5. Shantungia spinifera Walcott 



6. Agnostus kushanensis Walcott 



7. Stephanocare richthofeni Monke 



8. Damesella sp, 



9. Blackwelderia sp. 



FENGTIEN PROVINCE 



(.)nly the Upper Cambrian is known from Sha-kuo-T'un, Chin-Hsi-Hsien, 1^®!!^ 

 west Fengtien. The fossils were collected by. J. G. Andersson, mining adviser to the 

 Chinese Government. The section is given in the Bulletin of the Geological Society 

 of China (Vol. II No. 1-2 p. 101.). 



The following species are found in this limestone: 



Trilobita 



1. Ptychaspis walcotti'Mansuy 



2. Ptychaspis acaraus Walcott 



3. Ptychaspis chinhsihsiensis Sun 



■4. Ptychaspis (Anderssonia) fengtienensis Sun 



5. Agnostus sp. 



Brachiopoda 



6. Eoorthis shakuotunensis Sun 



This formation is characterized by two new species of Ptychaspis and certainly 

 belongs to the Upper part of the Cambrian. The Lower and the Middle Cambrian are 

 absent in this region and the Shakuotun limestone lies disconforraably upon the pre- 

 ( -ambrian (Sinian) rocks. 



The subdivisions of the Cambrian of N. China are as follows: 



