22 BULLETIN 164, UNITED STATES NATIONAL MUSEUM 



The weathered limestone strata of the Kangyao formation are 

 found in the fields 0.5 mile west of Shang-kang-j'ao, where I collected 

 many very fine Stones River fossils. 



SHANG-PING-CHOU SECTION 



The Ordovician strata are found on the low hills, Shih-ho-shan and 

 Yu-ho-shan near Shang-ping-chou, 8 miles east of Liao-yang. I 

 examined the Ordovician strata in the section that runs from south 

 to north and is the northward prolongation of the Cambrian and 

 Ozarkian section. 



All the beds dip 15° to 20° to the north, thereby making good 

 exposures. 



Ordovician 



SSUTEN FORMATION : 



1. Moderately thick-bedded, gray to light-gray limestone, full of 

 calcite veins; the beds average 15 cm in thickness; interbedded thin 

 edgewise conglomerates and dolomitic limestone beds at irregular 

 intervals, 160 m (524.8 feet). 



Fauna. — Annelid trails and borings, Armenoceras elegans^ new 

 species, and Maclurites higshyi (Hall), 



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

 ceous, dolomitic limestone in layers 4 to 20 cm thick, 40 m (131 feet). 



Total thickness of the Ssuyen, 200 m (656 feet). 



WUTING FORMATION : 



Moderately thick-bedded, gray to black limestone with many cal- 

 cite veins and with a few edgewise conglomerates, varying in thick- 

 ness from 2 to 20 cm, 280 m (918.4 feet). 



Fauna. — Numerous annelid borings ; Rafhistoma cf . aequilatenmi 

 Koken ? 



The Wuting, outcropping on a small hill near Lung-feng-ssu, 1 

 mile east of Yu-ho hill, yields many fragments of Maclurites and 

 other gastropods. 



Thus far I have not found any Kangyao and Santao fossils in 

 this section, but such may be obtained by further search. 



HSIA-KANG-YAO SECTION 



The Hsia-kang-yao section lies about 3.5 miles southeast of the 

 Yen-tai colliery. The measured section begins at the western foot 

 of Wu-ting hill and extends eastward via Hsia-kang-yao to the 

 north of Ta-ling. 



The strata from the Ssuyen to the Santao, inclusive, form a syn- 

 clinal structure on the axis of which Hsia-kang-yao is located. The 

 beds outcropping on Wu-ting hill dip 40° to the south. 



