Vol. I Sun— Cambrian Faunas of North China (iv) 15 



SHANTUNG CIIIHLI FENGTIEN 



• TAIAX REGION CHANGHIA REGION KAIPING BASIN CHINHSTHSIEN 



ft 



U. -U . Kaolishan limestone g Orthoceras Zone S Fengshan limestone Shakuotun limestone 



Chaumitien r^ ,~.i • • ,. ^ ^, 



limestone? Lhaumitien limestone c Changshan series 



M. -G . Kushan formation J Kushan formation "« Kushan shale 



j^ Changhia limestone _g Changhia limestone 



L. -G . Manto shale Manto shale Manto shale 



From the lithological, and stratigraphic relations, and the Palteontology, it is clear 

 that the early Middle Cambrian aea, must have been free from mechanical sediments to 

 permit the formation of oolitic limestone and then become gradually shallow in the late 

 Middle Cambrian and the Upper Cambrian time permitting the formation of shales and 

 intraformational conglomerates. 



The Lower Cambrian sea of China had no connection with the Atlantic or the 

 Boreal province; but the Middle Cambrian was to some extent confluent with the Boreal 

 and west American Provinces, and more particularly was this the case in Upper Cambri- 

 an time. 



A number of American genera, and even species are found in this country, 

 though, on the whole the faunas are quite distinct. 



DESCRIPTION OF SPECIES 



Class GRAPTOZOA Grabau 



Genus ClONOGRAPTUS Hall 



Clonograptus? Cambria Sun (sp. nov.) 



Plate I. Fig. 1. 



This species is only represented by one stipe slightly curved. 



Stipe somewhat rigid and slender. Thecse fifteen to sixteen in 10 mm., slender 

 tubes inclined 30" or more. Apertural margins concave oblique, conspicuously mucro- 

 nate. Each theca averages 1.5 mm. in length and 0.5 mm. in width. Maximum width 

 of stipe about 1 mm. 



In form this species resembles Clonograptus tenellus from the Dictyonema shale 

 of Sweden and England; but it differs in that it has 15 or 16 thecse in 10 mm. while in 

 C. tenellus only 10 thecge are found in 10 mm. As the generic determination is mainly 



