Vol. I Sun — Cambrian Faunas of North Ghini (iv) 13- 



The presence of Glonograptas and the Cyrtoceras figured by Walcott is of signifi- 

 cance, because both are more typical of the Ordovician and must at least be regarded as 

 transition types of the Cambro-Ordovician strata. The graptolite was found several 

 years ago by Mr. K. W. Hsu during an excursion to the locality in charge of Dr. H. W. 

 Wong. 



I agree with Dr. Walcott in putting this formation in the Upper Cambrian, but I 

 regret that I cannot follow him in including this formation in the Chaumitien limestone. 

 I am disposed to separate this formation under a new name, the Kaolishan (Kaoli) 

 formation, and to refer it to the uppermost part of the Upper Cambrian. 



b. Chaumitien. &MfS This is the type locality for the Chaumitien limestone 

 which was named by Willis and Blackwelder. Near the top of that limestone, we found 

 a new horizon characterized by a transition fauna. The name of Chaumitien limestone,. 

 I think, should be restricted to the lower part of that formation, while the upper beds 

 characterized by the Ordovician types should be given a separate name. 



The following species are found in the upper zone: 



Brachiopoda 



1. Billingsella sp. 



Cephalopoda 



2. Loxoceras cambria Sun* 



8. Orthoceras nanshanensis Sun* 



Trilobita 



4. Changia chinensis Sun 



5. Ptychaspis acamus var. punctata Sun 



6. Ptychaspis tani Sun 



Ptychaspis and Billingsella are the characteristic fossils of Upper Cambrian while 

 Loxoceras and Orthoceras are apparently Ordovician forms. 



Because the presence of Ptychaspis acamus Walcott I am constrained to put this 

 horizon in very late Cambrian rather than basal Ordovician, and consider that the cepha- 

 lopod element is a new invasion. 



It is evident that this formation, characterized by the mixed fauna, should not be 

 included in the Chaumitien limestone which is now restricted to those lower beds charac- 

 terized by Wurmkalke (intraformational conglomerates). This upper horizon, however, 

 may be the equivalent of the Fengshan series of Chihli. 



* These will be described in a reparate paper by the Author. 



