FOBMATIOlsrS AND FOSSILS OF SOTJTH MANCHURIA 



23 



Ordovician 



SSUTEN FORMATION : 



1. Moderately thick-bedded, gray to light-gray limestones with 

 many calcite veins, in layers 3 to 20 cm thick; with thin edgewise 

 conglomerates in some horizons, 250 m (820 feet). 



FauTia. — Ab follows: 



Maclurites Mgsiyi (Hall). 

 Armenoceras orientale, new species. 

 Armenoceras hassleri, new species. 



Armenoceras asiaticitm, new species. 

 Abundant annelid borings. 

 Many fragments of gastropods. 



2. Moderately thick-bedded, gray, arenaceous, dolomitic limestone ; 

 in beds averaging 5 cm in thickness, 30 m (98.4 feet). 

 Total of the Ssuyen formation, 280 m (918.4 feet). 



WUTING FORMATION : 



Moderately thick-bedded, mostly black, sometimes gray, limestone 

 with a few edgewise conglomerate layers, averaging 7 cm thick, 

 200 m (656 feet). 



Fmma. — Arenaceous limestones in the lower part of the formation 

 yield numerous fossils: 



Orthis calUgramma orthambonites von 



Buch. 

 RapMstoma of. aequilaterwn Koken? 



Helicotoma sp. 



Several undetermined trilobites. 



Annelid borings and trails. 



The Wuting formation outcrops typically on the top and southern 

 slope of Wu-ting hill and again on the western slope of the curved 

 ridge just west of Hui-kou, and on the low hill just west of 

 Hsia-kang-yao. 



Kangyao formation : 



Moderately thick-bedded, grayish-black limestone, with many cal- 

 cite veins in beds averaging 18 mm in thickness. The weathered 

 surfaces become yellowish rusty and leave a sticky mud. Many fine 

 Stones River (Mosheim stage) fossils were found in the deeply 

 weathered limestones. 



Fauna. — ^As follows: 



AntJiaspidella discoidalis, new species. 



Orthis calligrwrnma orthambonites von 

 Buch. 



Lophospira aojii, new species. 



Lophospira grabaui, new species. 



Lophospira Jcangyaoensis, new species, 



Lophospira manchuriensis, new spe- 

 cies. 



Lophospira produota pagodai, new va- 

 riety. 



Lophospira of. oweni Ulrich and Sco- 



field. 

 Lophospira turritiformis, new species. 

 Lophospira yentaiensis, new species. 

 Eotomaria barbouri (Grabau). 

 Eotomaria ulrichi, new species. 

 Solenospira species. 

 Undetermined trilobites. 



The Kangyao occurs in a very limited area in the maize field north- 

 west of Hsia-kang-yao. 



