FORMATIONS AND FOSSILS OF SOUTH MANCHURIA 29 



WUTING FORMATION : 



Moderately thick-bedded, gray to dark limestones, with thin edge- 

 wise conglomerate and arenaceous limestone beds ; varying in thick- 

 ness from 1 to 30 cm, 8 m (26.24 feet) . 



Fomna. — Orthoceras rectiseytatimh, new species. 



Kangyao formation : 



Moderately thick-bedded, black limestone with fragments of 

 gastropods. 



Canadian 

 Santao formation : 



Moderately thick-bedded, grayish, dark, somewhat arenaceous 

 limestone, the beds averaging 3 cm in thickness. 



Fauna. — This formation furnished a specimen of Penhsioce^'os 

 fusiforme from a locality in the valley of Ta-wan-kou, 1.5 miles 

 northeast of the Mu-hsin-tai colliery. 



hsiaoshih-tienshihfukou subdistrict 



This area, which embraces the Hsiao-shih and Tien-shih-fu-kou 

 coal fields, lies about 18 miles east of the Niu-hsin-tai district. The 

 Ordovician strata outcrop rather extensively, and I planned a close 

 study of the lower Palaeozoic and Sinian beds in the summer of 

 1928, but unfortunately strong antiforeign feeling among the Chi- 

 nese developed at that time, which drove me out of the area after 

 only a rapid reconnaissance in the vicinity of Hsiao-shih. Since 

 then there has been no opportunity to revisit the area, but I am 

 planning as soon as I return to Manchuria to visit particularly 

 Tien-shih-fu-kou and more eastern parts of the Tai-tzu-ho district. 



HSIAO-SHIH SECTION 



Notwithstanding my rapid reconnaissance, I fortunately found a 

 continuous section from the Ordovician to the Sinian along the 

 Hsiao-shih Eiver, a tributary of the Tai-tzu. 



Ordovician 

 SsuYEN formation: 



1. Moderately thick-bedded, gray to light-gray limestone in layers 

 2 to 30 cm thick, with interbedded thin edgewise conglomerate and 

 dolomitic limestone beds at irregular intervals, 200 m (656 feet). 



Fauna. — Fragments of cephalopods and gastropods ; annelid trails 

 and borings. 



From other localities in this area, I collected ArTYienoceras sondai, 

 new species, and Ormoceras proximum, new species. Therefore, I feel 

 sure more complete specimens can be found. 

 101621— S2 3 



