16 BULLETIN 16 4, UNITED STATES NATIONAL MUSEUM 



Chien-chanfr-tzu, Yao-tsui, Huang-kan-kou, Lao-hu-ti-kou, and 

 on Lung-wan-tien hill. 



In the Niu-hsin-tai subdistrict it occurs on the slope of the semi- 

 circular ridge surrounding the Niu-hsin-tai basin, and in the Hsiao- 

 shih subdistrict it is found near Hsiao-cha-kou, Po-chia-pu-tzu, 

 and Feng-mi-la-tzu ; it also occurs south of Hsieh-chia-wei-tzu and 

 Yao-pu-tzu. 



Stratigraphic relations. — The Wuting is conformably overlain by 

 the Ssuj^en formation throughout Manchuria, its upper boundary 

 being placed at the base of the dolomitic limestone of the overlying 

 Ssuyen. The lower boundary is somewhat difficult to place. In the 

 Kuantung district, it rests apparently conformably on the Ozarkian 

 Pingchou formation, but at the east end of the Wu-ting hill, 3 miles 

 south of the Yen-tai colliery, the Kangyao, referred to the Stones 

 River, is situated between it and the Canadian Santao formations. 



Even though I have not yet found beds unquestionably referable 

 to the Kangyao formation, except in the immediate vicinity of 

 Yen-tai and on the eastern slope of San-leng hill, near Wu-hu-tsui 

 colliery, it is quite reasonable to assume from faunal relationships 

 that it may be developed throughout most of the Tai-tzu-ho and 

 Pechili districts. 



Fauna. — As the fossiliferous sandy limestone of the Wuting forma- 

 tion is developed at many places, I have collected numerous fossils. 

 From the type locality, on the top of Wu-ting hill, I collected the 

 following species : 



Orthis calligraniina orthambonites von Bucli. 

 Raphistoma cf. aequilaterum Koken? 

 Helicotoma sp. 



Near Tai-chia-pu-tzu, 2 miles west of Chiao-tou station: 



Phyragmolites sp. 



Oxydiscus planulatus, new species. 



A remarkable fossil locality of this formation found in the vicinity 

 of the second tunnel, north of Pen-hsi-hu, produced the following 

 species : 



Orthis calligramma orthambonites 



von Buch. 

 Raphistoma cf. aequilaterum Koken. 



Plcctoceras ohtakai, new species. 

 Nybyoceras foerstei Endo. 

 Armenocer-as ntimntai, new species. 

 Ormoccras inanchuriense, new species. 

 Bathyurus? sp. 



Helicotoma sp. 



IJccyliopterus sp. 



Cycloceras ( V) marginale, new species. 



Besides the above localities, a few Wuting fossils were recovered 

 at several places in the Wu-hu-tsui, Niu-hsin-tai, and Hsiao-shih 

 subdistricts. 



Correlations. — From the presence of the fauna listed above it 

 is clear that the Wuting is equivalent to a portion (about Athens 



