69 



an appearance of conformable bedding. Both the upper and lower limits of 

 the Sin-tan are, therefore, regarded as conformable contacts." 



The green and variegated shales of the Sin-tan have as yet yielded no 

 fossils, but a small collection was obtained from the gray limestone which 

 might be considered as occurring in the top of the Sin-tan or at the base of 

 the Wu-shan, in an exposure at the upper end of the chasm, immediately 

 north of Tung-kuan-kou^* and south of Ta-miau-ssi.^^ " 



" From this material Dr. Girty has identified the following : 



Fistiilipora willisiana Girty Sclnichertella (?) sp. 



F. sp. Spirifcr (?) sp. 



Leioclevia sp. Rhynchonclla (?) sp. 



Tacniodictya (?) sp. Proetus (?) sp. 



Fenesiclla (?) sp. Fish plate (?) 



Dalmmiella (?) sp. Crinoidal fragments. 



" The evidence furnished by this fauna is not conclusive. The bryozoans 

 are considered by Ulrich and Bassler as of Lower Carboniferous (Mississip- 

 pian) age. The associated forms, however, are not entirely consonant and 

 suggest to Girty an earlier period — Devonian or possibly Silurian. ... In 

 the Wu-shan limestone at Tung-kuan-kou, 360 m. above this horizon and in 

 the immediate vicinity, Upper Carboniferous (Pennsylvanian) forms were 

 collected. Furthermore, fossils obtained on the Ta-ning-ho, from the basal 

 layers of the Wu-shan, are also of Upper Carboniferous age, and it is there- 

 fore probable that no part of the great limestone can be assigned to the Lower 

 Carboniferous. We thus have no more than a few feet of shale between a 

 definite Upper Carboniferous horizon and a doubtful one, which is either 

 Lower Carboniferous or earlier. We do not think it can be much earlier and 

 therefore assign it, and with it the passage from Sin-tan shale to Wu-shan 

 limestone, to the Lower Carboniferous. As the Middle Ordovician fauna 

 collected at Su-kia-pa is close to the transition zone from the Ki-sin-ling 

 limestone to the Sin-tan shale, that is, near the base of the shale, it is evident 



i) Tung-kuan-kou ■» 



"^'■inese characters unknown. 



2)Ta-miau ssi 



' jchir 



