FORMATIONS AND FOSSILS OF SOUTH MANCHURIA 



21 



Armenoceras tani (Grabau). 

 Armenoceras orientate, new species. 



Fauna. — As follows: 



Armenoceras couUngi (Grabau). 

 Armenoceras elongatum, new species. 

 Armenoceras nanUm takayamai, new 



variety. 



2. Moderately thick-bedded, light-gray, buff-weathering shaly, 

 arenaceous dolomitic limestone with some thin edgewise conglomer- 

 ates, 140 m (459.2 feet). 



Fauna. — No fossils found. 



This dolomitic limestone forms the main body of Tai-tzu, Kan- 

 tien, and San-leng hills. 



Total of Ssuyen, 240 m (787.2 feet). 

 WuTiNG formation: 



Moderately thick-bedded, gray to dark limestone, sometimes very 

 arenaceous, in layers 2 to 20 cm thick, with a few interbedded edge- 

 wise conglomerate layers, 160 m (524.8 feet). 



Fauna. — I collected Armenoceras and crinoid stems from this 

 formation on the northern slope of Ma hill. Some layers show 

 abundant traces of annelid borings within the rock or on its surface. 



The Wuting forms the main body of Ma hill and outer lower 

 slopes of San-leng hill. 

 Kangyao formation: 



Moderately thick-bedded, gray -black limestone, 20 m (65.6 feet). 



Fauna. — ^As follows: 



Lophospira aojii, new species. 

 Lophospira graba-uii, new species. 

 Eotomaria iardo>uri (Grabau). 



Eotomaria ulrichi, new species. 

 Many fine examples of undescribed 

 species of gastropods. 



TAI-TZU-HO DISTRICT 



The Ordovician and Canadian strata outcrop extensively along 

 both sides of Tai-tzu Kiver between Liao-yang and Kan-cheng. In 

 addition these beds also cover comparatively large areas south of 

 Ping-ting-shan, 13 miles northeast of Kan-cheng. For convenience 

 in description the Tai-tzu-ho district may be subdivided into four 

 subdistricts : Liaoyang-Yentai, Penhsihu-Niuhsintai, Hsiaoshih- 

 Tienshihfukou, and Ping-ting-shan. As I did not visit the last 

 named, it is omitted from the following description. (PI. 7.) 



LIAOYANG-YENTAI SUBDISTRICT 



The Liaoyang-Yentai subdistrict lies in the westernmost part of 

 the district. In this area Ordovician and Canadian rocks occupy 

 about 4 square miles south of Yen-tai. The village of Kang-yao 

 stands in the center of this outcrop. 



The Wuting formation is particularly well exposed in typical form 

 on the summit and southern slope of Wu-ting hill, where it yields fine 

 fossils. 



