(ii) 10 Palseontologia Sinica Ser. B. 



Orthoceras chinense Foord 

 Orthoceras regulare Schlotheim 

 Orthoceras squamatulum Barrande 

 Orthoceras thyrsus'^ Barrande 

 Orthoceras yangtzeense Yii 

 Orthoceras? wongi Yii 

 Protocycloceras deprati Reed 



2. Eastern Hupeh: The stratigraphical work of eastern Hupeh had been 

 done by Mr. Seijiro Noda^ , but his classification was found incorrect by Messrs. Hsieh 

 and Liu who were sent by the Geological Survey of China to study the geology of 

 Yang-sing and other districts^ in the autumn of 1923. They reported that the Ordovician 

 limestone at these localities is very thick and gray in colour. Because it was first found 

 at Ta-fang village in Yang-sing district, the Ordovician formation is called Tafang 

 limestone. Its actual thickness is unknown, because the basal part is not exposed. 

 Some Orthoceras and brachiopods are found in the limestone, and are very abundant 

 together with some trilobites in a layer of purple calcareous shale about 20 m. thick on 

 the top of the formation, which is regarded as the equivalent of the upper part of the 

 Neichiashan Series. The cephalopods of the collection now preserved in the laboratory 

 of the Survey are: 



Vaginoceras belemnitiforme Holm 

 V aginoceras endocylindricum Yii 

 Vaginoceras uniforme Yii 



3. SouTH-EASTKRN Hupeh: According to Mr. Li's Reports on the geology of 

 Pu-chi, Hsien-ning etc., it is shown that the Ordovician exposed in that area 

 is made up of limestone, which appears to be divided into two divisions. The 

 lower division is a thick-bedded dark gray limestone, of which the exposed thickness 

 amounts to about 500 m. The upper division consists of an alternation of reddish 

 thin-bedded limestone and calcareous shale, which attain a thickness of 140 m. overly- 

 ing a layer of the yellowish gray thin-bedded limestone 30 m. thick at its base. Many 

 cephalopods of large size were obtained, especially from the basal bed of the upper 

 division. A comparison of this upper division with the Neichiashan formation of 

 western Hupeh brings out the fact that though other fossils than the cephalopods in 



1. Geographical research in South China, Vol. II, pp. 241-281. 



2. C. Y. Hsieh: Stratigraphy of south-eastern Hupeh. Bulletin of the Geological Society of 

 China, Vol. Ill, No. 2. 



3. C. Li: Geology of Pu-chi, Kia-yu, Hsien-ning, Chung-yang and Wu-chang districts, Hupeh 

 Province. Memoir of the Institute of Geology, No. Ill, National Research Institute of China. 



