FORMATIONS AND FOSSILS OF SOUTH MANCHURIA 13 



Geographic distribution. — In the Kuantung district, the Ssuyen 

 outcrops in the eastern part on Kan-tao-tzu Island and near Hsi-tien- 

 chia-tun, one mile south of Aigawa. It also appears in the vicinity 

 of Chien-shih-hui-yao, northern slope of Tai-tzu-shan, and several 

 other small places. 



Near Wu-hu-tsui colliery, it forms the greater portion of San- 

 leng, Tai-tzu, and Kan-tien hills; it also appears south of Kan- 

 chia-tun. 



In the Liaoyang-Yentai subdistrict it outcrops on the eastern 

 lower slope of Chang-chia hill, and on both eastern and western low 

 hills of Hsia-kang-yao ; it also reappears on Shih-ho hill, 8 miles 

 east of Liao-yang, 



In the Pen-hsi-hu subdistrict is occurs at the northern rim of the 

 Pen-hsi-hu coal field and is also present on the Fu-chin-kou ridge, 

 southwest of Miyanohara station on the Antung-Mukden line. 



In the vicinity of Tao-yuan-kou colliery, it is found near Lao-hu- 

 ti-kou, Huang-kan-kou, and Huang-chi-kou. 



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

 circular ridge surrounding the Niu-hsin-tai basin. 



In the Hsiao-shih subdistrict it is found near Cheng-chang-kou, 

 Chuan-shui-ho-tzu, Tung-kou, Hsiao-cha-kou, Pi-chia-kou, and Niu- 

 ma-tai-kou. 



Stratigraphic relations. — ^The upper limit of the Ssuyen is clearly 

 defined throughout Manchuria, being overlain by the lithologically 

 distinct Carboniferous Wuhutsui formation. Everywhere it rests 

 conformably on the underlying Upper Chazyan, Wuting formation, 

 but the boundary between them is not so well defined. 



Fauna. — ^As stated previously there are two remarkable fossil 

 horizons in the Ssuyen formation. In general, a great many fossils 

 are found in this formation throughout South Manchuria. The fol- 

 lowing localities have yielded interesting fossils that have been 

 identified as well as the material will permit : 



From the black-banded limestone beds on the 60-meter hill, just 

 south of the Wu-hu-tsui colliery, I have identified the following 

 fossils: 



Armenoceras coulingi (Grabau). 

 Armenoceras nanum takayamai, 

 variety. 



Armenoceras elongatum, new species. 

 ArmenoGeras tani (Grabau). 

 Ormoceras orientale, new species. 



At a point 0.5 mile east of Kang-yao in the Yen-tai area another 

 good fossil locality has yielded the following : 



Maclurites Mgsbyi (Hall). 

 Armenoceras orientale, new species. 



Armenoceras asiaticum, new species. 

 Armenoceras hassleri, new species. 



A group of well-known fossil localities of the Ssuyen formation 

 are at points from Ta-ming-kou, just north of the Pen-hsi-hu coal 

 basin. Here I collected the following species : 

 101621—32 2 



